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<H1> A.4.4 Bounded-Length String Handling</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> The language-defined package Strings.Bounded provides
a generic package each of whose instances yields a private type Bounded_String
and a set of operations. An object of a particular Bounded_String type
represents a String whose low bound is 1 and whose length can vary conceptually
between 0 and a maximum size established at the generic instantiation.
The subprograms for fixed-length string handling are either overloaded
directly for Bounded_String, or are modified as needed to reflect the
variability in length. Additionally, since the Bounded_String type is
private, appropriate constructor and selector operations are provided.
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>1.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Reason: </B>Strings.Bounded
declares an inner generic package, versus itself being directly a generic
child of Strings, in order to retain compatibility with a version of
the string-handling packages that is generic with respect to the character
and string types.</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>1.b</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Reason: </B>The bound of a
bounded-length string is specified as a parameter to a generic, versus
as the value for a discriminant, because of the inappropriateness of
assignment and equality of discriminated types for the copying and comparison
of bounded strings.</FONT></DIV>
<H4 ALIGN=CENTER>Static Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> The library package
Strings.Bounded has the following declaration: </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="Examples"><TT><B>with</B> Ada.Strings.Maps;<BR>
<A NAME="I5244"></A><A NAME="I5245"></A><A NAME="I5246"></A><B>package</B> Ada.Strings.Bounded <B>is</B><BR>
<B>pragma</B> Preelaborate(Bounded);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DIV Class="Examples"><TT> <B>generic</B><BR>
Max : Positive; --<I> Maximum length of a Bounded_String</I><BR>
<B>package</B> <A NAME="I5247"></A>Generic_Bounded_Length <B>is</B></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DIV Class="Examples"><TT> <A NAME="I5248"></A>Max_Length : <B>constant</B> Positive := Max;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<DIV Class="Examples"><TT> <B>type</B> <A NAME="I5249"></A><A NAME="I5250"></A>Bounded_String <B>is</B> <B>private</B>;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<DIV Class="Examples"><TT> <A NAME="I5251"></A>Null_Bounded_String : <B>constant</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<DIV Class="Examples"><TT> <B>subtype</B> <A NAME="I5252"></A>Length_Range <B>is</B> Natural <B>range</B> 0 .. Max_Length;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>9</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5253"></A><A NAME="I5254"></A>Length (Source : <B>in</B> Bounded_String) <B>return</B> Length_Range;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>10</FONT></DIV>
<DIV Class="Examples"><TT> --<I> Conversion, Concatenation, and Selection functions</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>11</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5255"></A><A NAME="I5256"></A>To_Bounded_String (Source : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>12</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5257"></A><A NAME="I5258"></A>To_String (Source : <B>in</B> Bounded_String) <B>return</B> String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>13</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5259"></A><A NAME="I5260"></A>Append (Left, Right : <B>in</B> Bounded_String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>14</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5261"></A><A NAME="I5262"></A>Append (Left : <B>in</B> Bounded_String;<BR>
Right : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>15</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5263"></A><A NAME="I5264"></A>Append (Left : <B>in</B> String;<BR>
Right : <B>in</B> Bounded_String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>16</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5265"></A><A NAME="I5266"></A>Append (Left : <B>in</B> Bounded_String;<BR>
Right : <B>in</B> Character;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>17</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5267"></A><A NAME="I5268"></A>Append (Left : <B>in</B> Character;<BR>
Right : <B>in</B> Bounded_String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>18</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5269"></A><A NAME="I5270"></A>Append (Source : <B>in out</B> Bounded_String;<BR>
New_Item : <B>in</B> Bounded_String;<BR>
Drop : <B>in</B> Truncation := Error);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>19</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5271"></A><A NAME="I5272"></A>Append (Source : <B>in out</B> Bounded_String;<BR>
New_Item : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>20</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5273"></A><A NAME="I5274"></A>Append (Source : <B>in out</B> Bounded_String;<BR>
New_Item : <B>in</B> Character;<BR>
Drop : <B>in</B> Truncation := Error);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>21</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "&" (Left, Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>22</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "&" (Left : <B>in</B> Bounded_String; Right : <B>in</B> String)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>23</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "&" (Left : <B>in</B> String; Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>24</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "&" (Left : <B>in</B> Bounded_String; Right : <B>in</B> Character)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>25</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "&" (Left : <B>in</B> Character; Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>26</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5275"></A><A NAME="I5276"></A>Element (Source : <B>in</B> Bounded_String;<BR>
Index : <B>in</B> Positive)<BR>
<B>return</B> Character;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>27</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5277"></A><A NAME="I5278"></A>Replace_Element (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Index : <B>in</B> Positive;<BR>
By : <B>in</B> Character);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>28</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5279"></A><A NAME="I5280"></A>Slice (Source : <B>in</B> Bounded_String;<BR>
Low : <B>in</B> Positive;<BR>
High : <B>in</B> Natural)<BR>
<B>return</B> String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>29</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "=" (Left, Right : <B>in</B> Bounded_String) <B>return</B> Boolean;<BR>
<B>function</B> "=" (Left : <B>in</B> Bounded_String; Right : <B>in</B> String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>30</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "=" (Left : <B>in</B> String; Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>31</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "<" (Left, Right : <B>in</B> Bounded_String) <B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>32</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "<" (Left : <B>in</B> Bounded_String; Right : <B>in</B> String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>33</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "<" (Left : <B>in</B> String; Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>34</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "<=" (Left, Right : <B>in</B> Bounded_String) <B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>35</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "<=" (Left : <B>in</B> Bounded_String; Right : <B>in</B> String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>36</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "<=" (Left : <B>in</B> String; Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>37</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> ">" (Left, Right : <B>in</B> Bounded_String) <B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>38</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> ">" (Left : <B>in</B> Bounded_String; Right : <B>in</B> String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>39</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> ">" (Left : <B>in</B> String; Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>40</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> ">=" (Left, Right : <B>in</B> Bounded_String) <B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>41</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> ">=" (Left : <B>in</B> Bounded_String; Right : <B>in</B> String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>42</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> ">=" (Left : <B>in</B> String; Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>43</FONT></DIV>
<DIV Class="Examples"><TT> --<I> Search functions</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>44</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5281"></A><A NAME="I5282"></A>Index (Source : <B>in</B> Bounded_String;<BR>
Pattern : <B>in</B> String;<BR>
Going : <B>in</B> Direction := Forward;<BR>
Mapping : <B>in</B> Maps.Character_Mapping<BR>
:= Maps.Identity)<BR>
<B>return</B> Natural;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>45</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5283"></A><A NAME="I5284"></A>Index (Source : <B>in</B> Bounded_String;<BR>
Pattern : <B>in</B> String;<BR>
Going : <B>in</B> Direction := Forward;<BR>
Mapping : <B>in</B> Maps.Character_Mapping_Function)<BR>
<B>return</B> Natural;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>46</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5285"></A><A NAME="I5286"></A>Index (Source : <B>in</B> Bounded_String;<BR>
Set : <B>in</B> Maps.Character_Set;<BR>
Test : <B>in</B> Membership := Inside;<BR>
Going : <B>in</B> Direction := Forward)<BR>
<B>return</B> Natural;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>47</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5287"></A><A NAME="I5288"></A>Index_Non_Blank (Source : <B>in</B> Bounded_String;<BR>
Going : <B>in</B> Direction := Forward)<BR>
<B>return</B> Natural;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>48</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5289"></A><A NAME="I5290"></A>Count (Source : <B>in</B> Bounded_String;<BR>
Pattern : <B>in</B> String;<BR>
Mapping : <B>in</B> Maps.Character_Mapping<BR>
:= Maps.Identity)<BR>
<B>return</B> Natural;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>49</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5291"></A><A NAME="I5292"></A>Count (Source : <B>in</B> Bounded_String;<BR>
Pattern : <B>in</B> String;<BR>
Mapping : <B>in</B> Maps.Character_Mapping_Function)<BR>
<B>return</B> Natural;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>50</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5293"></A><A NAME="I5294"></A>Count (Source : <B>in</B> Bounded_String;<BR>
Set : <B>in</B> Maps.Character_Set)<BR>
<B>return</B> Natural;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>51</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5295"></A><A NAME="I5296"></A>Find_Token (Source : <B>in</B> Bounded_String;<BR>
Set : <B>in</B> Maps.Character_Set;<BR>
Test : <B>in</B> Membership;<BR>
First : <B>out</B> Positive;<BR>
Last : <B>out</B> Natural);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>52</FONT></DIV>
<DIV Class="Examples"><TT> --<I> String translation subprograms</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>53</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5297"></A><A NAME="I5298"></A>Translate (Source : <B>in</B> Bounded_String;<BR>
Mapping : <B>in</B> Maps.Character_Mapping)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>54</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5299"></A><A NAME="I5300"></A>Translate (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Mapping : <B>in</B> Maps.Character_Mapping);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>55</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5301"></A><A NAME="I5302"></A>Translate (Source : <B>in</B> Bounded_String;<BR>
Mapping : <B>in</B> Maps.Character_Mapping_Function)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>56</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5303"></A><A NAME="I5304"></A>Translate (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Mapping : <B>in</B> Maps.Character_Mapping_Function);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>57</FONT></DIV>
<DIV Class="Examples"><TT> --<I> String transformation subprograms</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>58</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5305"></A><A NAME="I5306"></A>Replace_Slice (Source : <B>in</B> Bounded_String;<BR>
Low : <B>in</B> Positive;<BR>
High : <B>in</B> Natural;<BR>
By : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>59</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5307"></A><A NAME="I5308"></A>Replace_Slice (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Low : <B>in</B> Positive;<BR>
High : <B>in</B> Natural;<BR>
By : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>60</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5309"></A><A NAME="I5310"></A>Insert (Source : <B>in</B> Bounded_String;<BR>
Before : <B>in</B> Positive;<BR>
New_Item : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>61</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5311"></A><A NAME="I5312"></A>Insert (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Before : <B>in</B> Positive;<BR>
New_Item : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>62</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5313"></A><A NAME="I5314"></A>Overwrite (Source : <B>in</B> Bounded_String;<BR>
Position : <B>in</B> Positive;<BR>
New_Item : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>63</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5315"></A><A NAME="I5316"></A>Overwrite (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Position : <B>in</B> Positive;<BR>
New_Item : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>64</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5317"></A><A NAME="I5318"></A>Delete (Source : <B>in</B> Bounded_String;<BR>
From : <B>in</B> Positive;<BR>
Through : <B>in</B> Natural)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>65</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5319"></A><A NAME="I5320"></A>Delete (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
From : <B>in</B> Positive;<BR>
Through : <B>in</B> Natural);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>66</FONT></DIV>
<DIV Class="Examples"><TT>--<I>String selector subprograms</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>67</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5321"></A><A NAME="I5322"></A>Trim (Source : <B>in</B> Bounded_String;<BR>
Side : <B>in</B> Trim_End)<BR>
<B>return</B> Bounded_String;<BR>
<B>procedure</B> <A NAME="I5323"></A><A NAME="I5324"></A>Trim (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Side : <B>in</B> Trim_End);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>68</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5325"></A><A NAME="I5326"></A>Trim (Source : <B>in</B> Bounded_String;<BR>
Left : <B>in</B> Maps.Character_Set;<BR>
Right : <B>in</B> Maps.Character_Set)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>69</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5327"></A><A NAME="I5328"></A>Trim (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Left : <B>in</B> Maps.Character_Set;<BR>
Right : <B>in</B> Maps.Character_Set);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>70</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5329"></A><A NAME="I5330"></A>Head (Source : <B>in</B> Bounded_String;<BR>
Count : <B>in</B> Natural;<BR>
Pad : <B>in</B> Character := Space;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>71</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5331"></A><A NAME="I5332"></A>Head (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Count : <B>in</B> Natural;<BR>
Pad : <B>in</B> Character := Space;<BR>
Drop : <B>in</B> Truncation := Error);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>72</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5333"></A><A NAME="I5334"></A>Tail (Source : <B>in</B> Bounded_String;<BR>
Count : <B>in</B> Natural;<BR>
Pad : <B>in</B> Character := Space;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>73</FONT></DIV>
<DIV Class="Examples"><TT> <B>procedure</B> <A NAME="I5335"></A><A NAME="I5336"></A>Tail (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Count : <B>in</B> Natural;<BR>
Pad : <B>in</B> Character := Space;<BR>
Drop : <B>in</B> Truncation := Error);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>74</FONT></DIV>
<DIV Class="Examples"><TT>--<I>String constructor subprograms</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>75</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "*" (Left : <B>in</B> Natural;<BR>
Right : <B>in</B> Character)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>76</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "*" (Left : <B>in</B> Natural;<BR>
Right : <B>in</B> String)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>77</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "*" (Left : <B>in</B> Natural;<BR>
Right : <B>in</B> Bounded_String)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>78</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5337"></A><A NAME="I5338"></A>Replicate (Count : <B>in</B> Natural;<BR>
Item : <B>in</B> Character;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>79</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5339"></A><A NAME="I5340"></A>Replicate (Count : <B>in</B> Natural;<BR>
Item : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>80</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5341"></A><A NAME="I5342"></A>Replicate (Count : <B>in</B> Natural;<BR>
Item : <B>in</B> Bounded_String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>81</FONT></DIV>
<DIV Class="Examples"><TT> <B>private</B><BR>
... -- <I>not specified by the language</I><BR>
<B>end</B> Generic_Bounded_Length;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>82</FONT></DIV>
<DIV Class="Examples"><TT><B>end</B> Ada.Strings.Bounded;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>82.a.1/1</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Implementation Note: </B>{<I><A HREF="defect2.html#8652/0097">8652/0097</A></I>}
<U>Bounded_String cannot be implemented as a (directly) controlled type,
as Ada.Strings.Bounded.Generic_Bounded_Length can be instantiated at
any nesting depth. Bounded_String could have a component of a controlled
type, as long as that type is declared in some other (non-generic) package
(including directly in Ada.Strings.Bounded).</U> </FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>83</FONT></DIV>
<DIV Class="Normal"> Null_Bounded_String represents the null string.
If an object of type Bounded_String is not otherwise initialized, it
will be initialized to the same value as Null_Bounded_String. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>84</FONT></DIV>
<DIV Class="Examples"><TT><B>function</B> Length (Source : <B>in</B> Bounded_String) <B>return</B> Length_Range;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>85</FONT></DIV>
<DIV Class="CodeIndented" Style="margin-bottom: 0.9em">The Length function
returns the length of the string represented by Source.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>86</FONT></DIV>
<DIV Class="Examples"><TT><B>function</B> To_Bounded_String (Source : <B>in</B> String;<BR>
Drop : <B>in</B> Truncation := Error)<BR>
<B>return</B> Bounded_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>87</FONT></DIV>
<DIV Class="CodeIndented" Style="margin-bottom: 0.4em">If Source'Length
<= Max_Length then this function returns a Bounded_String that represents
Source. Otherwise the effect depends on the value of Drop: </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>88</FONT></DIV>
<UL Class="CodeIndentedBulleted"><LI TYPE=DISC>If Drop=Left, then the result is a Bounded_String that
represents the string comprising the rightmost Max_Length characters
of Source.</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>89</FONT></DIV>
<UL Class="CodeIndentedBulleted"><LI TYPE=DISC>If Drop=Right, then the result is a Bounded_String that
represents the string comprising the leftmost Max_Length characters of
Source.</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>90</FONT></DIV>
<UL Class="CodeIndentedBulleted" Style="margin-bottom: 0.7em"><LI TYPE=DISC>If Drop=Error, then Strings.Length_Error is propagated.
</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>91</FONT></DIV>
<DIV Class="Examples"><TT><B>function</B> To_String (Source : <B>in</B> Bounded_String) <B>return</B> String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>92</FONT></DIV>
<DIV Class="CodeIndented" Style="margin-bottom: 0.9em">To_String returns
the String value with lower bound 1 represented by Source. If B is a
Bounded_String, then B = To_Bounded_String(To_String(B)). </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>93</FONT></DIV>
<DIV Class="Normal"> Each of the Append functions returns a Bounded_String
obtained by concatenating the string or character given or represented
by one of the parameters, with the string or character given or represented
by the other parameter, and applying To_Bounded_String to the concatenation
result string, with Drop as provided to the Append function.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>94</FONT></DIV>
<DIV Class="Normal"> Each of the procedures Append(Source, New_Item,
Drop) has the same effect as the corresponding assignment Source := Append(Source,
New_Item, Drop).</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>95</FONT></DIV>
<DIV Class="Normal"> Each of the "&" functions has the
same effect as the corresponding Append function, with Error as the Drop
parameter. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>96</FONT></DIV>
<DIV Class="Examples"><TT><B>function</B> Element (Source : <B>in</B> Bounded_String;<BR>
Index : <B>in</B> Positive)<BR>
<B>return</B> Character;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>97</FONT></DIV>
<DIV Class="CodeIndented" Style="margin-bottom: 0.9em">Returns the character
at position Index in the string represented by Source; propagates Index_Error
if Index > Length(Source).</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>98</FONT></DIV>
<DIV Class="Examples"><TT><B>procedure</B> Replace_Element (Source : <B>in</B> <B>out</B> Bounded_String;<BR>
Index : <B>in</B> Positive;<BR>
By : <B>in</B> Character);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>99</FONT></DIV>
<DIV Class="CodeIndented" Style="margin-bottom: 0.9em">Updates Source
such that the character at position Index in the string represented by
Source is By; propagates Index_Error if Index > Length(Source).</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>100</FONT></DIV>
<DIV Class="Examples"><TT><B>function</B> Slice (Source : <B>in</B> Bounded_String;<BR>
Low : <B>in</B> Positive;<BR>
High : <B>in</B> Natural)<BR>
<B>return</B> String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>101/1</FONT></DIV>
<DIV Class="CodeIndented">{<I><A HREF="defect1.html#8652/0049">8652/0049</A></I>}
Returns the slice at positions Low through High in the string represented
by Source; propagates Index_Error if Low > Length(Source)+1<U> or
High > Length(Source)</U>. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>102</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.9em"> Each of the functions
"=", "<", ">","<=",
and ">=" returns the same result as the corresponding String
operation applied to the String values given or represented by the two
parameters.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>103</FONT></DIV>
<DIV Class="Normal"> Each of the search subprograms (Index, Index_Non_Blank,
Count, Find_Token) has the same effect as the corresponding subprogram
in Strings.Fixed applied to the string represented by the Bounded_String
parameter.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>104</FONT></DIV>
<DIV Class="Normal"> Each of the Translate subprograms, when applied
to a Bounded_String, has an analogous effect to the corresponding subprogram
in Strings.Fixed. For the Translate function, the translation is applied
to the string represented by the Bounded_String parameter, and the result
is converted (via To_Bounded_String) to a Bounded_String. For the Translate
procedure, the string represented by the Bounded_String parameter after
the translation is given by the Translate function for fixed-length strings
applied to the string represented by the original value of the parameter.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>105/1</FONT></DIV>
<DIV Class="Normal"> {<I><A HREF="defect1.html#8652/0049">8652/0049</A></I>}
Each of the transformation subprograms (Replace_Slice, Insert, Overwrite,
Delete), selector subprograms (Trim, Head, Tail), and constructor functions
("*") has an effect based on its corresponding subprogram in
Strings.Fixed, and Replicate is based on Fixed."*". <U>In the
case of a function</U><S>For each of these subprograms</S>, the corresponding
fixed-length string subprogram is applied to the string represented by
the Bounded_String parameter. To_Bounded_String is applied the result
string, with Drop (or Error in the case of Generic_Bounded_Length."*")
determining the effect when the string length exceeds Max_Length. <U>In
the case of a procedure, the corresponding function in Strings.Bounded.Generic_Bounded_Length
is applied, with the result assigned into the Source parameter.</U> </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>105.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Ramification: </B>The "/="
operations between Bounded_String and String, and between String and
Bounded_String, are automatically defined based on the corrsponding "="
operations. </FONT></DIV>
<H4 ALIGN=CENTER>Implementation Advice</H4>
<DIV Class="Paranum"><FONT SIZE=-2>106</FONT></DIV>
<DIV Class="Normal"> Bounded string objects should not be implemented
by implicit pointers and dynamic allocation. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>106.a</FONT></DIV>
<DIV Class="Annotations" Style="margin-bottom: 0.4em"><FONT SIZE=-1><B>Implementation
Note: </B>The following is a possible implementation of the private part
of the package: </FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>106.b</FONT></DIV>
<DIV Class="SmallExamples"><TT><B>type</B> Bounded_String_Internals (Length : Length_Range := 0) <B>is</B><BR>
<B>record</B><BR>
Data : String(1..Length);<BR>
<B>end</B> <B>record</B>;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>106.c</FONT></DIV>
<DIV Class="SmallExamples"><TT><B>type</B> Bounded_String <B>is</B><BR>
<B>record</B><BR>
Data : Bounded_String_Internals; --<I> Unconstrained</I><BR>
<B>end</B> <B>record</B>;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>106.d</FONT></DIV>
<DIV Class="SmallExamples"><TT>Null_Bounded_String : <B>constant</B> Bounded_String :=<BR>
(Data => (Length => 0,<BR>
Data => (1..0 => ' ')));</TT></DIV>
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