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<Head>
<Title>Pair Associative Container</Title>
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<H1>Pair Associative Container</H1>
<Table CellPadding=0 CellSpacing=0 width=100%>
<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 Pair Associative Container is an <A href="AssociativeContainer.html">Associative Container</A> that
associates a key with some other object. The value type of a
Pair Associative Container is <tt><A href="pair.html">pair</A><const key_type, data_type></tt>. <A href="#1">[1]</A>
<h3>Refinement of</h3>
<A href="AssociativeContainer.html">Associative Container</A>
<h3>Associated types</h3>
One new type is introduced, in addition to the types defined in the
<A href="AssociativeContainer.html">Associative Container</A> requirements. Additionally, Pair Associative
Container introduces one new type restriction
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<TR>
<TD VAlign=top>
Key type
</TD>
<TD VAlign=top>
<tt>X::key_type</tt>
</TD>
<TD VAlign=top>
The type of the key associated with <tt>X::value_type</tt>.
</TD>
</TR>
<TR>
<TD VAlign=top>
Data type
</TD>
<TD VAlign=top>
<tt>X::data_type</tt>
</TD>
<TD VAlign=top>
The type of the data associated with <tt>X::value_type</tt>. A Pair Associative
Container can be thought of as a mapping from <tt>key_type</tt> to
<tt>data_type</tt>.
</TD>
</TR>
<TR>
<TD VAlign=top>
Value type
</TD>
<TD VAlign=top>
<tt>X::value_type</tt>
</TD>
<TD VAlign=top>
The type of object stored in the container. The value type is
required to be <tt><A href="pair.html">pair</A><const key_type, data_type></tt>.
</TD>
</tr>
</table>
<h3>Notation</h3>
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<TD VAlign=top>
<tt>X</tt>
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A type that is a model of Pair Associative Container
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<tt>a</tt>
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Object of type <tt>X</tt>
</TD>
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<tt>t</tt>
</TD>
<TD VAlign=top>
Object of type <tt>X::value_type</tt>
</TD>
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<TD VAlign=top>
<tt>d</tt>
</TD>
<TD VAlign=top>
Object of type <tt>X::data_type</tt>
</TD>
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<TR>
<TD VAlign=top>
<tt>k</tt>
</TD>
<TD VAlign=top>
Object of type <tt>X::key_type</tt>
</TD>
</TR>
<TR>
<TD VAlign=top>
<tt>p</tt>, <tt>q</tt>
</TD>
<TD VAlign=top>
Object of type <tt>X::iterator</tt>
</TD>
</tr>
</table>
<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>
<h3>Models</h3>
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<h3>Notes</h3>
<P><A name="1">[1]</A>
The value type must be <tt><A href="pair.html">pair</A><const key_type, data_type></tt>,
rather than <tt><A href="pair.html">pair</A><key_type, data_type></tt>, because of the
<A href="AssociativeContainer.html">Associative Container</A> invariant of key immutability. The
<tt>data_type</tt> part of an object in a Pair Associative Container may
be modified, but the <tt>key_type</tt> part may not be. Note the implication
of this fact: a Pair Associative Container cannot provide
mutable iterators (as defined in the <A href="trivial.html">Trivial Iterator</A>
requirements), because the value type of a mutable iterator must
be <A href="Assignable.html">Assignable</A>, and <tt><A href="pair.html">pair</A><const key_type, data_type></tt> is
not <A href="Assignable.html">Assignable</A>. However, a Pair Associative Container can
provide iterators that are not completely constant: iterators such
that the expression <tt>(*i).second = d</tt> is valid.
<h3>See also</h3>
<A href="AssociativeContainer.html">Associative Container</A>, <A href="SimpleAssociativeContainer.html">Simple Associative Container</A>
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