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<H1> 11.1 Exception Declarations</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> <A NAME="I3828"></A>An <FONT FACE="Arial, Helvetica">exception_declaration</FONT>
declares a name for an exception. </DIV>
<H4 ALIGN=CENTER>Syntax</H4>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="SyntaxIndented"><FONT FACE="Arial, Helvetica">exception_declaration<A NAME="I3829"></A>
::= </FONT><A NAME="I3830"></A><FONT FACE="Arial, Helvetica">defining_identifier_list</FONT> : <B>exception</B>;</DIV>
<H4 ALIGN=CENTER>Static Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="Normal"> Each single <FONT FACE="Arial, Helvetica">exception_declaration</FONT>
declares a name for a different exception. If a generic unit includes
an <FONT FACE="Arial, Helvetica">exception_declaration</FONT>, the <FONT FACE="Arial, Helvetica">exception_declaration</FONT>s
implicitly generated by different instantiations of the generic unit
refer to distinct exceptions (but all have the same <FONT FACE="Arial, Helvetica">defining_identifier</FONT>).
The particular exception denoted by an exception name is determined at
compilation time and is the same regardless of how many times the <FONT FACE="Arial, Helvetica">exception_declaration</FONT>
is elaborated. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DIV Class="Normal"> <A NAME="I3831"></A><A NAME="I3832"></A><A NAME="I3833"></A><A NAME="I3834"></A><A NAME="I3835"></A>The
<I>predefined</I> exceptions are the ones declared in the declaration
of package Standard: Constraint_Error, Program_Error, Storage_Error,
and Tasking_Error; one of them is raised when a language-defined check
fails. </DIV>
<H4 ALIGN=CENTER>Dynamic Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DIV Class="Normal"> <A NAME="I3836"></A>The elaboration of an <FONT FACE="Arial, Helvetica">exception_declaration</FONT>
has no effect.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<DIV Class="Normal"> <A NAME="I3837"></A><A NAME="I3838"></A><A NAME="I3839"></A>The
execution of any construct raises Storage_Error if there is insufficient
storage for that execution. <A NAME="I3840"></A>The amount of storage
needed for the execution of constructs is unspecified. </DIV>
<H4 ALIGN=CENTER>Examples</H4>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> <I>Examples of user-defined
exception declarations:</I> </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<DIV Class="Examples"><TT>Singular : <B>exception</B>;<BR>
Error : <B>exception</B>;<BR>
Overflow, Underflow : <B>exception</B>;</TT></DIV>
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