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<Head>
<Title>Simple Associative Container</Title>
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<H1>Simple Associative Container</H1>
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<TR>
<TD Align=left><Img src = "containers.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
<TD Align=right><Img src = "concept.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD>
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<TR>
<TD Align=left VAlign=top><b>Category</b>: containers</TD>
<TD Align=right VAlign=top><b>Component type</b>: concept</TD>
</TR>
</Table>
<h3>Description</h3>
A Simple Associative Container is an <A href="AssociativeContainer.html">Associative Container</A> where
elements are their own keys. A key in a Simple Associative Container
is not associated with any additional value.
<h3>Refinement of</h3>
<A href="AssociativeContainer.html">Associative Container</A>
<h3>Associated types</h3>
None, except for those described in the <A href="AssociativeContainer.html">Associative Container</A>
requirements. Simple Associative Container, however, introduces two
new type restrictions.
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Key type
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<tt>X::key_type</tt>
</TD>
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The type of the key associated with <tt>X::value_type</tt>. The types
<tt>key_type</tt> and <tt>value_type</tt> must be the same type.
</TD>
</TR>
<TR>
<TD VAlign=top>
Iterator
</TD>
<TD VAlign=top>
<tt>X::iterator</tt>
</TD>
<TD VAlign=top>
The type of iterator used to iterate through a Simple Associative
Container's elements. The types <tt>X::iterator</tt> and
<tt>X::const_iterator</tt> must be the same type. That is, a
Simple Associative Container does not provide mutable iterators. <A href="#1">[1]</A>
</TD>
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<h3>Notation</h3>
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<TD VAlign=top>
<tt>X</tt>
</TD>
<TD VAlign=top>
A type that is a model of Simple Associative Container
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>a</tt>
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Object of type <tt>X</tt>
</TD>
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<TD VAlign=top>
<tt>k</tt>
</TD>
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Object of type <tt>X::key_type</tt>
</TD>
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<TD VAlign=top>
<tt>p</tt>, <tt>q</tt>
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Object of type <tt>X::iterator</tt>
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<h3>Definitions</h3>
<h3>Valid expressions</h3>
None, except for those defined in the <A href="AssociativeContainer.html">Associative Container</A> requirements.
<h3>Expression semantics</h3>
<h3>Complexity guarantees</h3>
<h3>Invariants</h3>
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Immutability of Elements
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Every element of a Simple Associative Container is immutable. Objects
may be inserted and erased, but not modified. <A href="#1">[1]</A>
</TD>
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</table>
<h3>Models</h3>
<UL>
<LI>
<tt><A href="set.html">set</A></tt>
<LI>
<tt><A href="multiset.html">multiset</A></tt>
<LI>
<tt><A href="hash_set.html">hash_set</A></tt>
<LI>
<tt><A href="hash_multiset.html">hash_multiset</A></tt>
</UL>
<h3>Notes</h3>
<P><A name="1">[1]</A>
This is a consequence of the Immutability of Keys invariant of
<A href="AssociativeContainer.html">Associative Container</A>. Keys may never be modified; values in
a Simple Associative Container are themselves keys, so it immediately
follows that values in a Simple Associative Container may not be modified.
<h3>See also</h3>
<A href="AssociativeContainer.html">Associative Container</A>, <A href="PairAssociativeContainer.html">Pair Associative Container</A>
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