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     Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
    
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<Head>
<Title>Constant Associative Property Map Adaptor</Title>
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<H2><A NAME="sec:const-associative-property-map"></A>
</h2>
<PRE>
const_associative_property_map&lt;UniquePairAssociativeContainer&gt;
</PRE>

<P>
This property map is an adaptor that converts any type that is a model
of both <a
href="http://www.sgi.com/tech/stl/PairAssociativeContainer.html">Pair
Associative Container</a> and <a
href="http://www.sgi.com/tech/stl/UniqueAssociativeContainer.html">Unique
Associative Container</a> such as <a
href="http://www.sgi.com/tech/stl/Map.html"><tt>std::map</tt></a> into
a constant <a href="./LvaluePropertyMap.html">Lvalue Property Map</a>.
Note that the adaptor only retains a reference to the container, so
the lifetime of the container must encompass the use of the adaptor.
</P>

<h3>Example</h3>

<a href="../example/example1.cpp">example1.cpp</a>:
<pre>
<font color="#008040">#include &lt;iostream&gt;</font>
<font color="#008040">#include &lt;map&gt;</font>
<font color="#008040">#include &lt;string&gt;</font>
<font color="#008040">#include &lt;boost/property_map/property_map.hpp&gt;</font>


<B>template</B> &lt;<B>typename</B> ConstAddressMap&gt;
<B>void</B> display(ConstAddressMap address)
{
  <B>typedef</B> <B>typename</B> boost::property_traits&lt;ConstAddressMap&gt;::value_type
    value_type;
  <B>typedef</B> <B>typename</B> boost::property_traits&lt;ConstAddressMap&gt;::key_type key_type;

  key_type fred = <font color="#0000FF">"Fred"</font>;
  key_type joe = <font color="#0000FF">"Joe"</font>;

  value_type freds_address = get(address, fred);
  value_type joes_address = get(address, joe);
  
  std::cout &lt;&lt; fred &lt;&lt; <font color="#0000FF">": "</font> &lt;&lt; freds_address &lt;&lt; <font color="#0000FF">"\n"</font>
	    &lt;&lt; joe  &lt;&lt; <font color="#0000FF">": "</font> &lt;&lt; joes_address  &lt;&lt; <font color="#0000FF">"\n"</font>;
}

<B>int</B>
main()
{
  std::map&lt;std::string, std::string&gt; name2address;
  boost::const_associative_property_map&lt; std::map&lt;std::string, std::string&gt; &gt;
    address_map(name2address);

  name2address.insert(make_pair(std::string(<font color="#0000FF">"Fred"</font>), 
				std::string(<font color="#0000FF">"710 West 13th Street"</font>)));
  name2address.insert(make_pair(std::string(<font color="#0000FF">"Joe"</font>), 
				std::string(<font color="#0000FF">"710 West 13th Street"</font>)));

  display(address_map);
  
  <B>return</B> EXIT_SUCCESS;
}


</PRE>

<H3>Where Defined</H3>

<P>
<a href="../../../boost/property_map/property_map.hpp"><TT>boost/property_map/property_map.hpp</TT></a>

<p>
<H3>Model Of</H3>

<a href="./LvaluePropertyMap.html">Lvalue Property Map</a>

<P>

<H3>Template Parameters</H3>

<P>

<TABLE border>
<TR>
<th>Parameter</th><th>Description</th><th>Default</th>
</tr>


<TR>
<TD><TT>UniquePairAssociativeContainer</TT></TD> 
<TD>Must be a model of both <a
href="http://www.sgi.com/tech/stl/PairAssociativeContainer.html">Pair
Associative Container</a> and <a
href="http://www.sgi.com/tech/stl/UniqueAssociativeContainer.html">Unique
Associative Container</a> .</TD>
<TD>&nbsp;</td>
</tr>

</TABLE>
<P>

<H3>Members</H3>

<P>
In addition to the methods and functions required by <a
href="./LvaluePropertyMap.html">Lvalue Property Map</a>, this
class has the following members.

<hr>

<pre>
property_traits&lt;const_associative_property_map&gt;::value_type
</pre>
This is the same type as
<TT>UniquePairAssociativeContainer::data_type</TT>.

<hr>

<pre>
const_associative_property_map()
</pre>
Default Constructor.

<pre>
const_associative_property_map(const UniquePairAssociativeContainer&amp; c)
</pre>
Constructor.

<hr>

<pre>
const data_type&amp; operator[](const key_type&amp; k) const
</pre>
The operator bracket for property access.
The <TT>key_type</TT> and
<TT>data_type</TT> types are from the typedefs inside of
<TT>UniquePairAssociativeContainer</TT>.

<hr>

<h3>Non-Member functions</h3>

<hr>

<pre>
  template &lt;typename UniquePairAssociativeContainer&gt;
  const_associative_property_map&lt;UniquePairAssociativeContainer&gt;
  make_assoc_property_map(const UniquePairAssociativeContainer&amp; c);
</pre>
A function for conveniently creating an associative property map.


<hr>


<br>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright &copy 2002</TD><TD>
<a HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</a>,
Indiana University (<A
HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br>
<A HREF="http://www.boost.org/people/liequan_lee.htm">Lie-Quan Lee</A>, Indiana University (<A HREF="mailto:llee1@osl.iu.edu">llee1@osl.iu.edu</A>)<br>
<A HREF="http://www.osl.iu.edu/~lums">Andrew Lumsdaine</A>,
Indiana University (<A
HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>)
</TD></TR></TABLE>

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