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<H1> A.4.6 String-Handling Sets and Mappings</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> The language-defined package Strings.Maps.Constants
declares Character_Set and Character_Mapping constants corresponding
to classification and conversion functions in package Characters.Handling.
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>1.a</FONT></DIV>
<DIV Class="Annotations"><FONT SIZE=-1><B>Discussion: </B>The Constants
package is a child of Strings.Maps since it needs visibility of the private
part of Strings.Maps in order to initialize the constants in a preelaborable
way (i.e. via aggregates versus function calls). </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.Maps.Constants has the following declaration:</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="Examples"><TT><A NAME="I5429"></A><A NAME="I5430"></A><A NAME="I5431"></A><B>package</B> Ada.Strings.Maps.Constants <B>is</B><BR>
<B>pragma</B> Preelaborate(Constants);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DIV Class="Examples"><TT> <A NAME="I5432"></A>Control_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5433"></A>Graphic_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5434"></A>Letter_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5435"></A>Lower_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5436"></A>Upper_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5437"></A>Basic_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5438"></A>Decimal_Digit_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5439"></A>Hexadecimal_Digit_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5440"></A>Alphanumeric_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5441"></A>Special_Set : <B>constant</B> Character_Set;<BR>
<A NAME="I5442"></A>ISO_646_Set : <B>constant</B> Character_Set;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DIV Class="Examples"><TT> <A NAME="I5443"></A>Lower_Case_Map : <B>constant</B> Character_Mapping;<BR>
--<I>Maps to lower case for letters, else identity</I><BR>
<A NAME="I5444"></A>Upper_Case_Map : <B>constant</B> Character_Mapping;<BR>
--<I>Maps to upper case for letters, else identity</I><BR>
<A NAME="I5445"></A>Basic_Map : <B>constant</B> Character_Mapping;<BR>
--<I>Maps to basic letter for letters, else identity</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<DIV Class="Examples"><TT><B>private</B><BR>
... -- <I>not specified by the language</I><BR>
<B>end</B> Ada.Strings.Maps.Constants;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<DIV Class="Normal"> Each of these constants represents a correspondingly
named set of characters or character mapping in Characters.Handling (see
<A HREF="AA-A-3-2.html">A.3.2</A>). </DIV>
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