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<HR>
<H1>Annex K</H1>
<H2>(informative)</H2>
<H1>Language-Defined Attributes</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> <A NAME="I7352"></A>This annex summarizes the
definitions given elsewhere of the language-defined attributes.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DL Class="Hanging"><DT> P'Access<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> P that denotes a subprogram:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">P'Access yields an access value that designates
the subprogram denoted by P. The type of P'Access is an access-to-subprogram
type (<I>S</I>), as determined by the expected type. See 3.10.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DL Class="Hanging"><DT> X'Access<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> X that denotes an aliased
view of an object:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">X'Access yields an access value that designates
the object denoted by X. The type of X'Access is an access-to-object
type, as determined by the expected type. The expected type shall be
a general access type. See 3.10.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>6/1</FONT></DIV>
<DL Class="Hanging"><DT> X'Address<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
X that denotes an object, program unit, or label:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the address of the first of the storage
elements allocated to X. For a program unit or label, this value refers
to the machine code associated with the corresponding body or <FONT FACE="Arial, Helvetica">statement</FONT>.
The value of this attribute is of type System.Address. See 13.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<DL Class="Hanging"><DT> S'Adjacent<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>9</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Adjacent denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>10</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Adjacent (<I>X</I>, <I>Towards</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>11</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7353"></A>If <I>Towards</I> = <I>X</I>,
the function yields <I>X</I>; otherwise, it yields the machine number
of the type <I>T</I> adjacent to <I>X</I> in the direction of <I>Towards</I>,
if that machine number exists. <A NAME="I7354"></A><A NAME="I7355"></A>If
the result would be outside the base range of S, Constraint_Error is
raised. When <I>T</I>'Signed_Zeros is True, a zero result has the sign
of <I>X</I>. When <I>Towards</I> is zero, its sign has no bearing on
the result. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>12</FONT></DIV>
<DL Class="Hanging"><DT> S'Aft<DD Class="Hanging">
For every fixed point subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>13</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Aft yields the number of decimal digits needed
after the decimal point to accommodate the <I>delta</I> of the subtype
S, unless the <I>delta</I> of the subtype S is greater than 0.1, in which
case the attribute yields the value one. (S'Aft is the smallest positive
integer N for which (10**N)*S'Delta is greater than or equal to one.)
The value of this attribute is of the type <I>universal_integer</I>.
See 3.5.10.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>14/1</FONT></DIV>
<DL Class="Hanging"><DT> X'Alignment<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
X that denotes a subtype or object:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>15</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The Address of an object that is allocated under
control of the implementation is an integral multiple of the Alignment
of the object (that is, the Address modulo the Alignment is zero). The
offset of a record component is a multiple of the Alignment of the component.
For an object that is not allocated under control of the implementation
(that is, one that is imported, that is allocated by a user-defined allocator,
whose Address has been specified, or is designated by an access value
returned by an instance of Unchecked_Conversion), the implementation
may assume that the Address is an integral multiple of its Alignment.
The implementation shall not assume a stricter alignment.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>16</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The value of this attribute is of type <I>universal_integer</I>,
and nonnegative; zero means that the object is not necessarily aligned
on a storage element boundary. See 13.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>17</FONT></DIV>
<DL Class="Hanging"><DT> S'Base<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>18</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Base denotes an unconstrained subtype of the type
of S. This unconstrained subtype is called the <I>base subtype</I> of
the type. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>19</FONT></DIV>
<DL Class="Hanging"><DT> S'Bit_Order<DD Class="Hanging">
For every specific record subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>20</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the bit ordering for the type of S. The
value of this attribute is of type System.Bit_Order. See 13.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>21/1</FONT></DIV>
<DL Class="Hanging"><DT> P'Body_Version<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
P that statically denotes a program unit:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>22</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields a value of the predefined type String that
identifies the version of the compilation unit that contains the body
(but not any subunits) of the program unit. See E.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>23</FONT></DIV>
<DL Class="Hanging"><DT> T'Callable<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> T that is of a task
type (after any implicit dereference):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>24</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True when the task denoted by T
is <I>callable</I>, and False otherwise; See 9.9.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>25</FONT></DIV>
<DL Class="Hanging"><DT> E'Caller<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> E that denotes an <FONT FACE="Arial, Helvetica">entry_declaration</FONT>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>26</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields a value of the type Task_ID that identifies
the task whose call is now being serviced. Use of this attribute is allowed
only inside an <FONT FACE="Arial, Helvetica">entry_body</FONT> or <FONT FACE="Arial, Helvetica">accept_statement</FONT>
corresponding to the <FONT FACE="Arial, Helvetica">entry_declaration</FONT>
denoted by E. See C.7.1.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>27</FONT></DIV>
<DL Class="Hanging"><DT> S'Ceiling<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>28</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Ceiling denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>29</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Ceiling (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>30</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function yields the value <I>Ceiling</I>(<I>X</I>),
i.e., the smallest (most negative) integral value greater than or equal
to <I>X</I>. When <I>X</I> is zero, the result has the sign of <I>X</I>;
a zero result otherwise has a negative sign when S'Signed_Zeros is True.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>31</FONT></DIV>
<DL Class="Hanging"><DT> S'Class<DD Class="Hanging">
For every subtype S of an untagged private type whose full view is tagged:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>32</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the class-wide subtype corresponding to
the full view of S. This attribute is allowed only from the beginning
of the private part in which the full view is declared, until the declaration
of the full view. After the full view, the Class attribute of the full
view can be used. See 7.3.1.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>33</FONT></DIV>
<DL Class="Hanging"><DT> S'Class<DD Class="Hanging">
For every subtype S of a tagged type <I>T</I> (specific or class-wide):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>34</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Class denotes a subtype of the class-wide type
(called <I>T</I>'Class in this International Standard) for the class
rooted at <I>T</I> (or if S already denotes a class-wide subtype, then
S'Class is the same as S).</DL>
<DIV Class="Paranum"><FONT SIZE=-2>35</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7356"></A><A NAME="I7357"></A>S'Class
is unconstrained. However, if S is constrained, then the values of S'Class
are only those that when converted to the type <I>T</I> belong to S.
See 3.9.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>36/1</FONT></DIV>
<DL Class="Hanging"><DT> X'Component_Size<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
X that denotes an array subtype or array object (after any implicit dereference):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>37</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the size in bits of components of the type
of X. The value of this attribute is of type <I>universal_integer</I>.
See 13.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>38</FONT></DIV>
<DL Class="Hanging"><DT> S'Compose<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>39</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Compose denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>40</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Compose (<I>Fraction</I> : <I>T</I>;<BR>
<I>Exponent</I> : <I>universal_integer</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>41</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7358"></A>Let <I>v</I> be the value <I>Fraction</I>
· <I>T</I>'Machine_Radix<SUP><FONT SIZE=+1><FONT SIZE=-2><I>Exponent</I>-<I>k</I></FONT></FONT></SUP>,
where <I>k</I> is the normalized exponent of <I>Fraction</I>. If <I>v</I>
is a machine number of the type <I>T</I>, or if |<I>v</I>| >= <I>T</I>'Model_Small,
the function yields <I>v</I>; otherwise, it yields either one of the
machine numbers of the type <I>T</I> adjacent to <I>v</I>. <A NAME="I7359"></A><A NAME="I7360"></A>Constraint_Error
is optionally raised if <I>v</I> is outside the base range of S. A zero
result has the sign of <I>Fraction</I> when S'Signed_Zeros is True. See
A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>42</FONT></DIV>
<DL Class="Hanging"><DT> A'Constrained<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> A that is of a discriminated
type (after any implicit dereference):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>43</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True if A denotes a constant, a
value, or a constrained variable, and False otherwise. See 3.7.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>44</FONT></DIV>
<DL Class="Hanging"><DT> S'Copy_Sign<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>45</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Copy_Sign denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>46</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Copy_Sign (<I>Value</I>, <I>Sign</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>47</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7361"></A>If the value of <I>Value</I>
is nonzero, the function yields a result whose magnitude is that of <I>Value</I>
and whose sign is that of <I>Sign</I>; otherwise, it yields the value
zero. <A NAME="I7362"></A><A NAME="I7363"></A>Constraint_Error is optionally
raised if the result is outside the base range of S. A zero result has
the sign of <I>Sign</I> when S'Signed_Zeros is True. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>48</FONT></DIV>
<DL Class="Hanging"><DT> E'Count<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> E that denotes an entry
of a task or protected unit:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>49</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the number of calls presently queued on the
entry E of the current instance of the unit. The value of this attribute
is of the type <I>universal_integer</I>. See 9.9.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>50/1</FONT></DIV>
<DL Class="Hanging"><DT> S'Definite<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
S that denotes a formal indefinite subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>51</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Definite yields True if the actual subtype corresponding
to S is definite; otherwise it yields False. The value of this attribute
is of the predefined type Boolean. See 12.5.1.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>52</FONT></DIV>
<DL Class="Hanging"><DT> S'Delta<DD Class="Hanging">
For every fixed point subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>53</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Delta denotes the <I>delta</I> of the fixed point
subtype S. The value of this attribute is of the type <I>universal_real</I>.
See 3.5.10.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>54</FONT></DIV>
<DL Class="Hanging"><DT> S'Denorm<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>55</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True if every value expressible
in the form<BR>
± <I>mantissa</I> · <I>T</I>'Machine_Radix<SUP><FONT SIZE=+1><FONT SIZE=-2><I>T</I>'Machine_Emin</FONT></FONT></SUP><BR>
where <I>mantissa</I> is a nonzero <I>T</I>'Machine_Mantissa-digit fraction
in the number base <I>T</I>'Machine_Radix, the first digit of which is
zero, is a machine number (see <A HREF="AA-3-5-7.html">3.5.7</A>) of
the type <I>T</I>; yields the value False otherwise. The value of this
attribute is of the predefined type Boolean. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>56</FONT></DIV>
<DL Class="Hanging"><DT> S'Digits<DD Class="Hanging">
For every decimal fixed point subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>57</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Digits denotes the <I>digits</I> of the decimal
fixed point subtype S, which corresponds to the number of decimal digits
that are representable in objects of the subtype. The value of this attribute
is of the type <I>universal_integer</I>. See 3.5.10.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>58</FONT></DIV>
<DL Class="Hanging"><DT> S'Digits<DD Class="Hanging">
For every floating point subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>59</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Digits denotes the requested decimal precision
for the subtype S. The value of this attribute is of the type <I>universal_integer</I>.
See 3.5.8.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>60</FONT></DIV>
<DL Class="Hanging"><DT> S'Exponent<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>61</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Exponent denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>62</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Exponent (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>universal_integer</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>63</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function yields the normalized exponent of <I>X</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>64</FONT></DIV>
<DL Class="Hanging"><DT> S'External_Tag<DD Class="Hanging">
For every subtype S of a tagged type <I>T</I> (specific or class-wide):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>65</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7364"></A><A NAME="I7365"></A>S'External_Tag
denotes an external string representation for S'Tag; it is of the predefined
type String. External_Tag may be specified for a specific tagged type
via an <FONT FACE="Arial, Helvetica">attribute_definition_clause</FONT>;
the expression of such a clause shall be static. The default external
tag representation is implementation defined. See <A HREF="AA-3-9-2.html">3.9.2</A>
and <A HREF="AA-13-13-2.html">13.13.2</A>. See 13.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>66/1</FONT></DIV>
<DL Class="Hanging"><DT> A'First<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
A that is of an array type (after any implicit dereference), or denotes
a constrained array subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>67</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">A'First denotes the lower bound of the first index
range; its type is the corresponding index type. See 3.6.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>68</FONT></DIV>
<DL Class="Hanging"><DT> S'First<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>69</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'First denotes the lower bound of the range of
S. The value of this attribute is of the type of S. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>70/1</FONT></DIV>
<DL Class="Hanging"><DT> A'First(N)<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
A that is of an array type (after any implicit dereference), or denotes
a constrained array subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>71</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">A'First(N) denotes the lower bound of the N-th index
range; its type is the corresponding index type. See 3.6.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>72</FONT></DIV>
<DL Class="Hanging"><DT> R.C'First_Bit<DD Class="Hanging">
For a component C of a composite, non-array object R:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>73</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the offset, from the start of the first
of the storage elements occupied by C, of the first bit occupied by C.
This offset is measured in bits. The first bit of a storage element is
numbered zero. The value of this attribute is of the type <I>universal_integer</I>.
See 13.5.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>74</FONT></DIV>
<DL Class="Hanging"><DT> S'Floor<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>75</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Floor denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>76</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Floor (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>77</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function yields the value <I>Floor</I>(<I>X</I>),
i.e., the largest (most positive) integral value less than or equal to
<I>X</I>. When <I>X</I> is zero, the result has the sign of <I>X</I>;
a zero result otherwise has a positive sign. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>78</FONT></DIV>
<DL Class="Hanging"><DT> S'Fore<DD Class="Hanging">
For every fixed point subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>79</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Fore yields the minimum number of characters needed
before the decimal point for the decimal representation of any value
of the subtype S, assuming that the representation does not include an
exponent, but includes a one-character prefix that is either a minus
sign or a space. (This minimum number does not include superfluous zeros
or underlines, and is at least 2.) The value of this attribute is of
the type <I>universal_integer</I>. See 3.5.10.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>80</FONT></DIV>
<DL Class="Hanging"><DT> S'Fraction<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>81</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Fraction denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>82</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Fraction (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>83</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function yields the value <I>X</I> ·
<I>T</I>'Machine_Radix<SUP><FONT SIZE=+1><FONT SIZE=-2>-<I>k</I></FONT></FONT></SUP>,
where <I>k</I> is the normalized exponent of <I>X</I>. A zero result,
which can only occur when <I>X</I> is zero, has the sign of <I>X</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>84</FONT></DIV>
<DL Class="Hanging"><DT> T'Identity<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> T that is of a task
type (after any implicit dereference):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>85</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields a value of the type Task_ID that identifies
the task denoted by T. See C.7.1.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>86/1</FONT></DIV>
<DL Class="Hanging"><DT> E'Identity<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
E that denotes an exception:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>87</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">E'Identity returns the unique identity of the exception.
The type of this attribute is Exception_Id. See 11.4.1.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>88</FONT></DIV>
<DL Class="Hanging"><DT> S'Image<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>89</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Image denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>90</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Image(<I>Arg</I> : S'Base)<BR>
<B>return</B> String</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>91</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function returns an image of the value of <I>Arg</I>
as a String. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>92</FONT></DIV>
<DL Class="Hanging"><DT> S'Class'Input<DD Class="Hanging">
For every subtype S'Class of a class-wide type <I>T</I>'Class:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>93</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Class'Input denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>94</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Class'Input(<BR>
<I>Stream</I> : <B>access</B> Ada.Streams.Root_Stream_Type'Class)<BR>
<B>return</B> <I>T</I>'Class</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>95</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">First reads the external tag from <I>Stream</I>
and determines the corresponding internal tag (by calling Tags.Internal_Tag(String'Input(<I>Stream</I>))
-- see <A HREF="AA-3-9.html">3.9</A>) and then dispatches to the subprogram
denoted by the Input attribute of the specific type identified by the
internal tag; returns that result. See 13.13.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>96</FONT></DIV>
<DL Class="Hanging"><DT> S'Input<DD Class="Hanging">
For every subtype S of a specific type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>97</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Input denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>98</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Input(<BR>
<I>Stream</I> : <B>access</B> Ada.Streams.Root_Stream_Type'Class)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>99</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Input reads and returns one value from <I>Stream</I>,
using any bounds or discriminants written by a corresponding S'Output
to determine how much to read. See 13.13.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>100/1</FONT></DIV>
<DL Class="Hanging"><DT> A'Last<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
A that is of an array type (after any implicit dereference), or denotes
a constrained array subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>101</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">A'Last denotes the upper bound of the first index
range; its type is the corresponding index type. See 3.6.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>102</FONT></DIV>
<DL Class="Hanging"><DT> S'Last<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>103</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Last denotes the upper bound of the range of S.
The value of this attribute is of the type of S. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>104/1</FONT></DIV>
<DL Class="Hanging"><DT> A'Last(N)<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
A that is of an array type (after any implicit dereference), or denotes
a constrained array subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>105</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">A'Last(N) denotes the upper bound of the N-th index
range; its type is the corresponding index type. See 3.6.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>106</FONT></DIV>
<DL Class="Hanging"><DT> R.C'Last_Bit<DD Class="Hanging">
For a component C of a composite, non-array object R:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>107</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the offset, from the start of the first
of the storage elements occupied by C, of the last bit occupied by C.
This offset is measured in bits. The value of this attribute is of the
type <I>universal_integer</I>. See 13.5.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>108</FONT></DIV>
<DL Class="Hanging"><DT> S'Leading_Part<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>109</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Leading_Part denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>110</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Leading_Part (<I>X</I> : <I>T</I>;<BR>
<I>Radix_Digits</I> : <I>universal_integer</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>111</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Let <I>v</I> be the value <I>T</I>'Machine_Radix<SUP><FONT SIZE=+1><FONT SIZE=-2><I>k</I>-<I>Radix_Digits</I></FONT></FONT></SUP>,
where <I>k</I> is the normalized exponent of <I>X</I>. The function yields
the value </DL>
<DIV Class="Paranum"><FONT SIZE=-2>112</FONT></DIV>
<UL Class="IndentedBulleted"><LI TYPE=DISC><I>Floor</I>(<I>X</I>/<I>v</I>) · <I>v</I>, when
<I>X</I> is nonnegative and <I>Radix_Digits</I> is positive;</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>113</FONT></DIV>
<UL Class="IndentedBulleted"><LI TYPE=DISC><I>Ceiling</I>(<I>X</I>/<I>v</I>) · <I>v</I>, when
<I>X</I> is negative and <I>Radix_Digits</I> is positive. </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>114</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7366"></A><A NAME="I7367"></A><A NAME="I7368"></A>Constraint_Error
is raised when <I>Radix_Digits</I> is zero or negative. A zero result,
which can only occur when <I>X</I> is zero, has the sign of <I>X</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>115/1</FONT></DIV>
<DL Class="Hanging"><DT> A'Length<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
A that is of an array type (after any implicit dereference), or denotes
a constrained array subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>116</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">A'Length denotes the number of values of the first
index range (zero for a null range); its type is <I>universal_integer</I>.
See 3.6.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>117/1</FONT></DIV>
<DL Class="Hanging"><DT> A'Length(N)<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
A that is of an array type (after any implicit dereference), or denotes
a constrained array subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>118</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">A'Length(N) denotes the number of values of the
N-th index range (zero for a null range); its type is <I>universal_integer</I>.
See 3.6.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>119</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>120</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Machine denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>121</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Machine (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>122</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7369"></A>If <I>X</I> is a machine number
of the type <I>T</I>, the function yields <I>X</I>; otherwise, it yields
the value obtained by rounding or truncating <I>X</I> to either one of
the adjacent machine numbers of the type <I>T</I>. <A NAME="I7370"></A><A NAME="I7371"></A>Constraint_Error
is raised if rounding or truncating <I>X</I> to the precision of the
machine numbers results in a value outside the base range of S. A zero
result has the sign of <I>X</I> when S'Signed_Zeros is True. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>123</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Emax<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>124</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the largest (most positive) value of <I>exponent</I>
such that every value expressible in the canonical form (for the type
<I>T</I>), having a <I>mantissa</I> of <I>T</I>'Machine_Mantissa digits,
is a machine number (see <A HREF="AA-3-5-7.html">3.5.7</A>) of the type
<I>T</I>. This attribute yields a value of the type <I>universal_integer</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>125</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Emin<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>126</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the smallest (most negative) value of <I>exponent</I>
such that every value expressible in the canonical form (for the type
<I>T</I>), having a <I>mantissa</I> of <I>T</I>'Machine_Mantissa digits,
is a machine number (see <A HREF="AA-3-5-7.html">3.5.7</A>) of the type
<I>T</I>. This attribute yields a value of the type <I>universal_integer</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>127</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Mantissa<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>128</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the largest value of <I>p</I> such that every
value expressible in the canonical form (for the type <I>T</I>), having
a <I>p</I>-digit <I>mantissa</I> and an <I>exponent</I> between <I>T</I>'Machine_Emin
and <I>T</I>'Machine_Emax, is a machine number (see <A HREF="AA-3-5-7.html">3.5.7</A>)
of the type <I>T</I>. This attribute yields a value of the type <I>universal_integer</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>129</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Overflows<DD Class="Hanging">
For every subtype S of a fixed point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>130</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True if overflow and divide-by-zero
are detected and reported by raising Constraint_Error for every predefined
operation that yields a result of the type <I>T</I>; yields the value
False otherwise. The value of this attribute is of the predefined type
Boolean. See A.5.4.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>131</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Overflows<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>132</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True if overflow and divide-by-zero
are detected and reported by raising Constraint_Error for every predefined
operation that yields a result of the type <I>T</I>; yields the value
False otherwise. The value of this attribute is of the predefined type
Boolean. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>133</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Radix<DD Class="Hanging">
For every subtype S of a fixed point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>134</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the radix of the hardware representation
of the type <I>T</I>. The value of this attribute is of the type <I>universal_integer</I>.
See A.5.4.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>135</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Radix<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>136</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the radix of the hardware representation
of the type <I>T</I>. The value of this attribute is of the type <I>universal_integer</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>137</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Rounds<DD Class="Hanging">
For every subtype S of a fixed point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>138</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True if rounding is performed on
inexact results of every predefined operation that yields a result of
the type <I>T</I>; yields the value False otherwise. The value of this
attribute is of the predefined type Boolean. See A.5.4.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>139</FONT></DIV>
<DL Class="Hanging"><DT> S'Machine_Rounds<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>140</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True if rounding is performed on
inexact results of every predefined operation that yields a result of
the type <I>T</I>; yields the value False otherwise. The value of this
attribute is of the predefined type Boolean. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>141</FONT></DIV>
<DL Class="Hanging"><DT> S'Max<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>142</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Max denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>143</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Max(<I>Left</I>, <I>Right</I> : S'Base)<BR>
<B>return</B> S'Base</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>144</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function returns the greater of the values of
the two parameters. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>145</FONT></DIV>
<DL Class="Hanging"><DT> S'Max_Size_In_Storage_Elements<DD Class="Hanging">
For every subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>146</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the maximum value for Size_In_Storage_Elements
that will be requested via Allocate for an access type whose designated
subtype is S. The value of this attribute is of type <I>universal_integer</I>.
See 13.11.1.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>147</FONT></DIV>
<DL Class="Hanging"><DT> S'Min<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>148</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Min denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>149</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Min(<I>Left</I>, <I>Right</I> : S'Base)<BR>
<B>return</B> S'Base</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>150</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function returns the lesser of the values of
the two parameters. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>151</FONT></DIV>
<DL Class="Hanging"><DT> S'Model<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>152</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Model denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>153</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Model (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>154</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">If the Numerics Annex is not supported, the meaning
of this attribute is implementation defined; see <A HREF="AA-G-2-2.html">G.2.2</A>
for the definition that applies to implementations supporting the Numerics
Annex. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>155</FONT></DIV>
<DL Class="Hanging"><DT> S'Model_Emin<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>156</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">If the Numerics Annex is not supported, this attribute
yields an implementation defined value that is greater than or equal
to the value of <I>T</I>'Machine_Emin. See <A HREF="AA-G-2-2.html">G.2.2</A>
for further requirements that apply to implementations supporting the
Numerics Annex. The value of this attribute is of the type <I>universal_integer</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>157</FONT></DIV>
<DL Class="Hanging"><DT> S'Model_Epsilon<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>158</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value <I>T</I>'Machine_Radix<SUP><FONT SIZE=+1><FONT SIZE=-2>1
- <I>T</I>'Model_Mantissa</FONT></FONT></SUP>. The value of this attribute
is of the type <I>universal_real</I>. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>159</FONT></DIV>
<DL Class="Hanging"><DT> S'Model_Mantissa<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>160</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">If the Numerics Annex is not supported, this attribute
yields an implementation defined value that is greater than or equal
to <I>Ceiling</I>(<I>d</I> · log(10) / log(<I>T</I>'Machine_Radix))
+ 1, where <I>d</I> is the requested decimal precision of <I>T</I>, and
less than or equal to the value of <I>T</I>'Machine_Mantissa. See <A HREF="AA-G-2-2.html">G.2.2</A>
for further requirements that apply to implementations supporting the
Numerics Annex. The value of this attribute is of the type <I>universal_integer</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>161</FONT></DIV>
<DL Class="Hanging"><DT> S'Model_Small<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>162</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value <I>T</I>'Machine_Radix<SUP><FONT SIZE=+1><FONT SIZE=-2><I>T</I>'Model_Emin
- 1</FONT></FONT></SUP>. The value of this attribute is of the type <I>universal_real</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>163</FONT></DIV>
<DL Class="Hanging"><DT> S'Modulus<DD Class="Hanging">
For every modular subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>164</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Modulus yields the modulus of the type of S, as
a value of the type <I>universal_integer</I>. See 3.5.4.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>165</FONT></DIV>
<DL Class="Hanging"><DT> S'Class'Output<DD Class="Hanging">
For every subtype S'Class of a class-wide type <I>T</I>'Class:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>166</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Class'Output denotes a procedure with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>167</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>procedure</B> S'Class'Output(<BR>
<I>Stream</I> : <B>access</B> Ada.Streams.Root_Stream_Type'Class;<BR>
<I>Item</I> : <B>in</B> <I>T</I>'Class)</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>168</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">First writes the external tag of <I>Item</I> to
<I>Stream</I> (by calling String'Output(Tags.External_Tag(<I>Item</I>'Tag)
-- see <A HREF="AA-3-9.html">3.9</A>) and then dispatches to the subprogram
denoted by the Output attribute of the specific type identified by the
tag. See 13.13.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>169</FONT></DIV>
<DL Class="Hanging"><DT> S'Output<DD Class="Hanging">
For every subtype S of a specific type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>170</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Output denotes a procedure with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>171</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>procedure</B> S'Output(<BR>
<I>Stream</I> : <B>access</B> Ada.Streams.Root_Stream_Type'Class;<BR>
<I>Item</I> : <B>in</B> <I>T</I>)</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>172</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Output writes the value of <I>Item</I> to <I>Stream</I>,
including any bounds or discriminants. See 13.13.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>173/1</FONT></DIV>
<DL Class="Hanging"><DT> D'Partition_ID<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
D that denotes a library-level declaration, excepting a declaration of
or within a declared-pure library unit:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>174</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes a value of the type <I>universal_integer</I>
that identifies the partition in which D was elaborated. If D denotes
the declaration of a remote call interface library unit (see <A HREF="AA-E-2-3.html">E.2.3</A>)
the given partition is the one where the body of D was elaborated. See
E.1.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>175</FONT></DIV>
<DL Class="Hanging"><DT> S'Pos<DD Class="Hanging">
For every discrete subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>176</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Pos denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>177</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Pos(<I>Arg</I> : S'Base)<BR>
<B>return</B> <I>universal_integer</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>178</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">This function returns the position number of the
value of <I>Arg</I>, as a value of type <I>universal_integer</I>. See
3.5.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>179</FONT></DIV>
<DL Class="Hanging"><DT> R.C'Position<DD Class="Hanging">
For a component C of a composite, non-array object R:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>180</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the same value as R.C'Address - R'Address.
The value of this attribute is of the type <I>universal_integer</I>.
See 13.5.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>181</FONT></DIV>
<DL Class="Hanging"><DT> S'Pred<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>182</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Pred denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>183</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Pred(<I>Arg</I> : S'Base)<BR>
<B>return</B> S'Base</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>184</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7372"></A>For an enumeration type, the
function returns the value whose position number is one less than that
of the value of <I>Arg</I>; <A NAME="I7373"></A><A NAME="I7374"></A>Constraint_Error
is raised if there is no such value of the type. For an integer type,
the function returns the result of subtracting one from the value of
<I>Arg</I>. For a fixed point type, the function returns the result of
subtracting <I>small</I> from the value of <I>Arg</I>. For a floating
point type, the function returns the machine number (as defined in <A HREF="AA-3-5-7.html">3.5.7</A>)
immediately below the value of <I>Arg</I>; <A NAME="I7375"></A><A NAME="I7376"></A>Constraint_Error
is raised if there is no such machine number. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>185/1</FONT></DIV>
<DL Class="Hanging"><DT> A'Range<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
A that is of an array type (after any implicit dereference), or denotes
a constrained array subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>186</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">A'Range is equivalent to the range A'First .. A'Last,
except that the <FONT FACE="Arial, Helvetica">prefix</FONT> A is only
evaluated once. See 3.6.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>187</FONT></DIV>
<DL Class="Hanging"><DT> S'Range<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>188</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Range is equivalent to the <FONT FACE="Arial, Helvetica">range</FONT>
S'First .. S'Last. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>189/1</FONT></DIV>
<DL Class="Hanging"><DT> A'Range(N)<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
A that is of an array type (after any implicit dereference), or denotes
a constrained array subtype:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>190</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">A'Range(N) is equivalent to the range A'First(N)
.. A'Last(N), except that the <FONT FACE="Arial, Helvetica">prefix</FONT>
A is only evaluated once. See 3.6.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>191</FONT></DIV>
<DL Class="Hanging"><DT> S'Class'Read<DD Class="Hanging">
For every subtype S'Class of a class-wide type <I>T</I>'Class:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>192</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Class'Read denotes a procedure with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>193</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>procedure</B> S'Class'Read(<BR>
<I>Stream</I> : <B>access</B> Ada.Streams.Root_Stream_Type'Class;<BR>
<I>Item</I> : <B>out</B> <I>T</I>'Class)</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>194</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Dispatches to the subprogram denoted by the Read
attribute of the specific type identified by the tag of Item. See 13.13.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>195</FONT></DIV>
<DL Class="Hanging"><DT> S'Read<DD Class="Hanging">
For every subtype S of a specific type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>196</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Read denotes a procedure with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>197</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>procedure</B> S'Read(<BR>
<I>Stream</I> : <B>access</B> Ada.Streams.Root_Stream_Type'Class;<BR>
<I>Item</I> : <B>out</B> <I>T</I>)</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>198</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Read reads the value of <I>Item</I> from <I>Stream</I>.
See 13.13.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>199</FONT></DIV>
<DL Class="Hanging"><DT> S'Remainder<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>200</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Remainder denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>201</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Remainder (<I>X</I>, <I>Y</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>202</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7377"></A>For nonzero <I>Y</I>, let <I>v</I>
be the value <I>X</I> - <I>n</I> · <I>Y</I>, where <I>n</I> is
the integer nearest to the exact value of <I>X</I>/<I>Y</I>; if |<I>n</I>
- <I>X</I>/<I>Y</I>| = 1/2, then <I>n</I> is chosen to be even. If
<I>v</I> is a machine number of the type <I>T</I>, the function yields
<I>v</I>; otherwise, it yields zero. <A NAME="I7378"></A><A NAME="I7379"></A>Constraint_Error
is raised if <I>Y</I> is zero. A zero result has the sign of <I>X</I>
when S'Signed_Zeros is True. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>203</FONT></DIV>
<DL Class="Hanging"><DT> S'Round<DD Class="Hanging">
For every decimal fixed point subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>204</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Round denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>205</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Round(<I>X</I> : <I>universal_real</I>)<BR>
<B>return</B> S'Base</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>206</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function returns the value obtained by rounding
X (away from 0, if X is midway between two values of the type of S).
See 3.5.10.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>207</FONT></DIV>
<DL Class="Hanging"><DT> S'Rounding<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>208</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Rounding denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>209</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Rounding (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>210</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function yields the integral value nearest to
<I>X</I>, rounding away from zero if <I>X</I> lies exactly halfway between
two integers. A zero result has the sign of <I>X</I> when S'Signed_Zeros
is True. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>211</FONT></DIV>
<DL Class="Hanging"><DT> S'Safe_First<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>212</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the lower bound of the safe range (see <A HREF="AA-3-5-7.html">3.5.7</A>)
of the type <I>T</I>. If the Numerics Annex is not supported, the value
of this attribute is implementation defined; see <A HREF="AA-G-2-2.html">G.2.2</A>
for the definition that applies to implementations supporting the Numerics
Annex. The value of this attribute is of the type <I>universal_real</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>213</FONT></DIV>
<DL Class="Hanging"><DT> S'Safe_Last<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>214</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the upper bound of the safe range (see <A HREF="AA-3-5-7.html">3.5.7</A>)
of the type <I>T</I>. If the Numerics Annex is not supported, the value
of this attribute is implementation defined; see <A HREF="AA-G-2-2.html">G.2.2</A>
for the definition that applies to implementations supporting the Numerics
Annex. The value of this attribute is of the type <I>universal_real</I>.
See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>215</FONT></DIV>
<DL Class="Hanging"><DT> S'Scale<DD Class="Hanging">
For every decimal fixed point subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>216</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Scale denotes the <I>scale</I> of the subtype
S, defined as the value N such that S'Delta = 10.0**(-N). <A NAME="I7380"></A>The
scale indicates the position of the point relative to the rightmost significant
digits of values of subtype S. The value of this attribute is of the
type <I>universal_integer</I>. See 3.5.10.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>217</FONT></DIV>
<DL Class="Hanging"><DT> S'Scaling<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>218</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Scaling denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>219</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Scaling (<I>X</I> : <I>T</I>;<BR>
<I>Adjustment</I> : <I>universal_integer</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>220</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7381"></A>Let <I>v</I> be the value <I>X</I>
· <I>T</I>'Machine_Radix<SUP><FONT SIZE=+1><FONT SIZE=-2><I>Adjustment</I></FONT></FONT></SUP>.
If <I>v</I> is a machine number of the type <I>T</I>, or if |<I>v</I>|
>= <I>T</I>'Model_Small, the function yields <I>v</I>; otherwise, it
yields either one of the machine numbers of the type <I>T</I> adjacent
to <I>v</I>. <A NAME="I7382"></A><A NAME="I7383"></A>Constraint_Error
is optionally raised if <I>v</I> is outside the base range of S. A zero
result has the sign of <I>X</I> when S'Signed_Zeros is True. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>221</FONT></DIV>
<DL Class="Hanging"><DT> S'Signed_Zeros<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>222</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True if the hardware representation
for the type <I>T</I> has the capability of representing both positively
and negatively signed zeros, these being generated and used by the predefined
operations of the type <I>T</I> as specified in IEC 559:1989; yields
the value False otherwise. The value of this attribute is of the predefined
type Boolean. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>223</FONT></DIV>
<DL Class="Hanging"><DT> S'Size<DD Class="Hanging">
For every subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>224</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">If S is definite, denotes the size (in bits) that
the implementation would choose for the following objects of subtype
S: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>225</FONT></DIV>
<UL Class="IndentedBulleted"><LI TYPE=DISC>A record component of subtype S when the record type is
packed.</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>226</FONT></DIV>
<UL Class="IndentedBulleted"><LI TYPE=DISC>The formal parameter of an instance of Unchecked_Conversion
that converts from subtype S to some other subtype. </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>227</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">If S is indefinite, the meaning is implementation
defined. The value of this attribute is of the type <I>universal_integer</I>.
See 13.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>228/1</FONT></DIV>
<DL Class="Hanging"><DT> X'Size<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
X that denotes an object:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>229</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the size in bits of the representation of
the object. The value of this attribute is of the type <I>universal_integer</I>.
See 13.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>230</FONT></DIV>
<DL Class="Hanging"><DT> S'Small<DD Class="Hanging">
For every fixed point subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>231</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Small denotes the <I>small</I> of the type of
S. The value of this attribute is of the type <I>universal_real</I>.
See 3.5.10.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>232</FONT></DIV>
<DL Class="Hanging"><DT> S'Storage_Pool<DD Class="Hanging">
For every access subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>233</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the storage pool of the type of S. The type
of this attribute is Root_Storage_Pool'Class. See 13.11.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>234</FONT></DIV>
<DL Class="Hanging"><DT> S'Storage_Size<DD Class="Hanging">
For every access subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>235</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the result of calling Storage_Size(S'Storage_Pool),
which is intended to be a measure of the number of storage elements reserved
for the pool. The type of this attribute is <I>universal_integer</I>.
See 13.11.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>236/1</FONT></DIV>
<DL Class="Hanging"><DT> T'Storage_Size<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
T that denotes a task object (after any implicit dereference):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>237</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Denotes the number of storage elements reserved
for the task. The value of this attribute is of the type <I>universal_integer</I>.
The Storage_Size includes the size of the task's stack, if any. The language
does not specify whether or not it includes other storage associated
with the task (such as the ``task control block'' used by some implementations.)
See 13.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>238</FONT></DIV>
<DL Class="Hanging"><DT> S'Succ<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>239</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Succ denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>240</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Succ(<I>Arg</I> : S'Base)<BR>
<B>return</B> S'Base</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>241</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7384"></A>For an enumeration type, the
function returns the value whose position number is one more than that
of the value of <I>Arg</I>; <A NAME="I7385"></A><A NAME="I7386"></A>Constraint_Error
is raised if there is no such value of the type. For an integer type,
the function returns the result of adding one to the value of <I>Arg</I>.
For a fixed point type, the function returns the result of adding <I>small</I>
to the value of <I>Arg</I>. For a floating point type, the function returns
the machine number (as defined in <A HREF="AA-3-5-7.html">3.5.7</A>)
immediately above the value of <I>Arg</I>; <A NAME="I7387"></A><A NAME="I7388"></A>Constraint_Error
is raised if there is no such machine number. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>242</FONT></DIV>
<DL Class="Hanging"><DT> X'Tag<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> X that is of a class-wide
tagged type (after any implicit dereference):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>243</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">X'Tag denotes the tag of X. The value of this attribute
is of type Tag. See 3.9.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>244</FONT></DIV>
<DL Class="Hanging"><DT> S'Tag<DD Class="Hanging">
For every subtype S of a tagged type <I>T</I> (specific or class-wide):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>245</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Tag denotes the tag of the type <I>T</I> (or if
<I>T</I> is class-wide, the tag of the root type of the corresponding
class). The value of this attribute is of type Tag. See 3.9.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>246</FONT></DIV>
<DL Class="Hanging"><DT> T'Terminated<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> T that is of a task
type (after any implicit dereference):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>247</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields the value True if the task denoted by T is
terminated, and False otherwise. The value of this attribute is of the
predefined type Boolean. See 9.9.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>248</FONT></DIV>
<DL Class="Hanging"><DT> S'Truncation<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>249</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Truncation denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>250</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Truncation (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>251</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function yields the value <I>Ceiling</I>(<I>X</I>)
when <I>X</I> is negative, and <I>Floor</I>(<I>X</I>) otherwise. A zero
result has the sign of <I>X</I> when S'Signed_Zeros is True. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>252</FONT></DIV>
<DL Class="Hanging"><DT> S'Unbiased_Rounding<DD Class="Hanging">
For every subtype S of a floating point type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>253</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Unbiased_Rounding denotes a function with the
following specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>254</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Unbiased_Rounding (<I>X</I> : <I>T</I>)<BR>
<B>return</B> <I>T</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>255</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">The function yields the integral value nearest to
<I>X</I>, rounding toward the even integer if <I>X</I> lies exactly halfway
between two integers. A zero result has the sign of <I>X</I> when S'Signed_Zeros
is True. See A.5.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>256</FONT></DIV>
<DL Class="Hanging"><DT> X'Unchecked_Access<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> X that denotes an aliased
view of an object:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>257</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">All rules and semantics that apply to X'Access (see
<A HREF="AA-3-10-2.html">3.10.2</A>) apply also to X'Unchecked_Access,
except that, for the purposes of accessibility rules and checks, it is
as if X were declared immediately within a library package. See 13.10.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>258</FONT></DIV>
<DL Class="Hanging"><DT> S'Val<DD Class="Hanging">
For every discrete subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>259</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Val denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>260</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Val(<I>Arg</I> : <I>universal_integer</I>)<BR>
<B>return</B> S'Base</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>261</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7389"></A><A NAME="I7390"></A>This function
returns a value of the type of S whose position number equals the value
of <I>Arg</I>. See 3.5.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>262</FONT></DIV>
<DL Class="Hanging"><DT> X'Valid<DD Class="Hanging">
For a <FONT FACE="Arial, Helvetica">prefix</FONT> X that denotes a scalar
object (after any implicit dereference):</DL>
<DIV Class="Paranum"><FONT SIZE=-2>263</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields True if and only if the object denoted by
X is normal and has a valid representation. The value of this attribute
is of the predefined type Boolean. See 13.9.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>264</FONT></DIV>
<DL Class="Hanging"><DT> S'Value<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>265</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Value denotes a function with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>266</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Value(<I>Arg</I> : String)<BR>
<B>return</B> S'Base</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>267</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">This function returns a value given an image of
the value as a String, ignoring any leading or trailing spaces. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>268/1</FONT></DIV>
<DL Class="Hanging"><DT> P'Version<DD Class="Hanging">
For a <U><FONT FACE="Arial, Helvetica">prefix</FONT></U><S>prefix</S>
P that statically denotes a program unit:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>269</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Yields a value of the predefined type String that
identifies the version of the compilation unit that contains the declaration
of the program unit. See E.3.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>270</FONT></DIV>
<DL Class="Hanging"><DT> S'Wide_Image<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>271</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Wide_Image denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>272</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Wide_Image(<I>Arg</I> : S'Base)<BR>
<B>return</B> Wide_String</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>273</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging"><A NAME="I7391"></A>The function returns an <I>image</I>
of the value of <I>Arg</I>, that is, a sequence of characters representing
the value in display form. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>274</FONT></DIV>
<DL Class="Hanging"><DT> S'Wide_Value<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>275</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Wide_Value denotes a function with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>276</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>function</B> S'Wide_Value(<I>Arg</I> : Wide_String)<BR>
<B>return</B> S'Base</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>277</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">This function returns a value given an image of
the value as a Wide_String, ignoring any leading or trailing spaces.
See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>278</FONT></DIV>
<DL Class="Hanging"><DT> S'Wide_Width<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>279</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Wide_Width denotes the maximum length of a Wide_String
returned by S'Wide_Image over all values of the subtype S. It denotes
zero for a subtype that has a null range. Its type is <I>universal_integer</I>.
See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>280</FONT></DIV>
<DL Class="Hanging"><DT> S'Width<DD Class="Hanging">
For every scalar subtype S:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>281</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Width denotes the maximum length of a String returned
by S'Image over all values of the subtype S. It denotes zero for a subtype
that has a null range. Its type is <I>universal_integer</I>. See 3.5.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>282</FONT></DIV>
<DL Class="Hanging"><DT> S'Class'Write<DD Class="Hanging">
For every subtype S'Class of a class-wide type <I>T</I>'Class:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>283</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Class'Write denotes a procedure with the following
specification: </DL>
<DIV Class="Paranum"><FONT SIZE=-2>284</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>procedure</B> S'Class'Write(<BR>
<I>Stream</I> : <B>access</B> Ada.Streams.Root_Stream_Type'Class;<BR>
<I>Item</I> : <B>in</B> <I>T</I>'Class)</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>285</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">Dispatches to the subprogram denoted by the Write
attribute of the specific type identified by the tag of Item. See 13.13.2.</DL>
<DIV Class="Paranum"><FONT SIZE=-2>286</FONT></DIV>
<DL Class="Hanging"><DT> S'Write<DD Class="Hanging">
For every subtype S of a specific type <I>T</I>:</DL>
<DIV Class="Paranum"><FONT SIZE=-2>287</FONT></DIV>
<DL Class="Hanging" Style="margin-bottom: 0.4em"><DD Class ="Hanging">S'Write denotes a procedure with the following specification:
</DL>
<DIV Class="Paranum"><FONT SIZE=-2>288</FONT></DIV>
<DIV Class="IndentedExamples"><TT><B>procedure</B> S'Write(<BR>
<I>Stream</I> : <B>access</B> Ada.Streams.Root_Stream_Type'Class;<BR>
<I>Item</I> : <B>in</B> <I>T</I>)</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>289</FONT></DIV>
<DL Class="Hanging"><DD Class ="Hanging">S'Write writes the value of <I>Item</I> to <I>Stream</I>.
See 13.13.2.</DL>
<HR>
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