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<body>
<div class="document" id="boost-pointer-container-library">
<h1 class="title"><img alt="Boost" src="boost.png" /> Pointer Container Library</h1>

<div class="section" id="class-ptr-multimap-adapter">
<h1>Class <tt class="docutils literal">ptr_multimap_adapter</tt></h1>
<p>This class is used to build custom pointer containers with
an underlying multimap-like container. The interface of the class is an extension
of the interface from <tt class="docutils literal">associative_ptr_container</tt>.</p>
<p><strong>Hierarchy:</strong></p>
<ul class="simple">
<li><a class="reference external" href="reversible_ptr_container.html">reversible_ptr_container</a><ul>
<li><a class="reference external" href="associative_ptr_container.html">associative_ptr_container</a><ul>
<li><a class="reference external" href="ptr_set_adapter.html">ptr_set_adapter</a></li>
<li><a class="reference external" href="ptr_multiset_adapter.html">ptr_multiset_adapter</a></li>
<li><a class="reference external" href="ptr_map_adapter.html">ptr_map_adapter</a></li>
<li><tt class="docutils literal">ptr_multi_map_adapter</tt><ul>
<li><a class="reference external" href="ptr_set.html">ptr_set</a></li>
<li><a class="reference external" href="ptr_multiset.html">ptr_multi_set</a></li>
<li><a class="reference external" href="ptr_map.html">ptr_map</a></li>
<li><a class="reference external" href="ptr_multimap.html">ptr_multimap</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
</ul>
<p><strong>Navigate:</strong></p>
<ul class="simple">
<li><a class="reference external" href="ptr_container.html">home</a></li>
<li><a class="reference external" href="reference.html">reference</a></li>
</ul>
<p><strong>Synopsis:</strong></p>
<pre class="literal-block">
namespace boost
{
    template
    &lt;
        T,
        class VoidPtrMultiMap,
        class CloneAllocator = heap_clone_allocator
    &gt;
    class ptr_multimap_adapter
    {
    public: // <a class="reference internal" href="#typedefs">typedefs</a>
        typedef VoidPtrMap::key_type key_type;
        typedef T*                   mapped_type;
        typedef T&amp;                   mapped_reference;
        typedef const T&amp;             const_mapped_reference;
        typedef ...                  value_type;
        typedef ...                  reference;
        typedef ...                  const_reference;
        typedef ...                  pointer;
        typedef ...                  const_pointer;

    public: // <a class="reference internal" href="#modifiers">modifiers</a>
        iterator  insert( key_type&amp; k, T* x );
        template&lt; class U &gt;
        iterator  insert( const key_type&amp;, <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt; x );

    public: // <a class="reference internal" href="#pointer-container-requirements">pointer container requirements</a>
        void      transfer( iterator object, ptr_multimap_adapter&amp; from );
        size_type transfer( iterator first, iterator last, ptr_multimap_adapter&amp; from );
        template&lt; class Range &gt;
        size_type transfer( const Range&amp; r, ptr_multimap_adapter&amp; from );
        void      transfer( ptr_multimap_adapter&amp; from );

    }; //  class 'ptr_multimap_adapter'

} // namespace 'boost'
</pre>
</div>
<div class="section" id="semantics">
<h1>Semantics</h1>
<p>. <span class="target" id="typedefs">typedefs</span>:</p>
<div class="section" id="semantics-typedefs">
<h2>Semantics: typedefs</h2>
<p>The following types are implementation defined:</p>
<pre class="literal-block">
typedef ... value_type;
typedef ... reference;
typedef ... const_reference;
typedef ... pointer;
typedef ... const_pointer;
</pre>
<p>However, the structure of the type mimics <tt class="docutils literal"><span class="pre">std::pair</span></tt> s.t. one
can use <tt class="docutils literal">first</tt> and <tt class="docutils literal">second</tt> members. The reference-types
are not real references and the pointer-types are not real pointers.
However, one may still write</p>
<pre class="literal-block">
map_type::value_type       a_value      = *m.begin();
a_value.second-&gt;foo();
map_type::reference        a_reference  = *m.begin();
a_reference.second-&gt;foo();
map_type::const_reference  a_creference = *const_begin(m);
map_type::pointer          a_pointer    = &amp;*m.begin();
a_pointer-&gt;second-&gt;foo();
map_type::const_pointer    a_cpointer   = &amp;*const_begin(m);
</pre>
<p>The difference compared to <tt class="docutils literal"><span class="pre">std::map&lt;Key,T*&gt;</span></tt> is that constness
is propagated to the pointer (that is, to <tt class="docutils literal">second</tt>) in <tt class="docutils literal">const_itertor</tt>.</p>
</div>
<div class="section" id="semantics-modifiers">
<span id="modifiers"></span><h2>Semantics: modifiers</h2>
<ul>
<li><p class="first"><tt class="docutils literal">iterator insert( key_type&amp; k, T* x );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">x != 0</tt></li>
<li>Effects: Takes ownership of <tt class="docutils literal">x</tt> and returns an iterator pointing to it.</li>
<li>Throws: bad_pointer if <tt class="docutils literal">x == 0</tt></li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class U &gt; iterator insert( const key_type&amp; k, <span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt;</span> x );</tt></p>
<blockquote>
<ul class="simple">
<li>Equivalent to (but without the <tt class="docutils literal">const_cast</tt>): <tt class="docutils literal">return insert( <span class="pre">const_cast&lt;key_type&amp;&gt;(k),</span> x.release() );</tt></li>
</ul>
</blockquote>
</li>
</ul>
<!-- - ``iterator insert( key_type& k, const_reference x );``

- Effects: ``return insert( allocate_clone( x ) );``

- Exception safety: Strong guarantee -->
<span class="target" id="lookup"></span><!-- Semantics: lookup
^^^^^^^^^^^^^^^^^

- ``reference        operator[]( const Key& key );``
- ``const_reference  operator[]( const Key& key ) const;``

    - Requirements: the key exists

    - Effects: returns the object with key ``key``

    - Throws: ``bad_ptr_container_operation`` if the key does not exist -->
</div>
<div class="section" id="semantics-pointer-container-requirements">
<span id="pointer-container-requirements"></span><h2>Semantics: pointer container requirements</h2>
<ul>
<li><p class="first"><tt class="docutils literal">void transfer( iterator object, ptr_multimap_adapter&amp; from );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">not from.empty()</tt></li>
<li>Effects: Inserts the object defined by <tt class="docutils literal">object</tt> into the container and remove it from <tt class="docutils literal">from</tt>.</li>
<li>Postconditions: <tt class="docutils literal">size()</tt> is one more, <tt class="docutils literal">from.size()</tt> is one less.</li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">void transfer( iterator first, iterator last, ptr_multimap_adapter&amp; from );</tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal">not from.empty()</tt></li>
<li>Effects: Inserts the objects defined by the range <tt class="docutils literal">[first,last)</tt> into the container and remove it from <tt class="docutils literal">from</tt>.</li>
<li>Postconditions: Let <tt class="docutils literal">N == <span class="pre">std::distance(first,last);</span></tt> then <tt class="docutils literal">size()</tt> is <tt class="docutils literal">N</tt> more, <tt class="docutils literal">from.size()</tt> is <tt class="docutils literal">N</tt> less.</li>
<li>Exception safety: Basic guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">template&lt; class Range &gt; void transfer( const Range&amp; r, ptr_multimap_adapter&amp; from );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">transfer( <span class="pre">boost::begin(r),</span> <span class="pre">boost::end(r),</span> from );</tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal">void transfer( ptr_multimap_adapter&amp; from );</tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal">transfer( <span class="pre">from.begin(),</span> <span class="pre">from.end(),</span> from );</tt>.</li>
<li>Postconditions: <tt class="docutils literal"><span class="pre">from.empty();</span></tt></li>
<li>Exception safety: Basic guarantee</li>
</ul>
</blockquote>
</li>
</ul>
<hr><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Copyright:</th><td class="field-body">Thorsten Ottosen 2004-2006. Use, modification and distribution is subject to the Boost Software License, Version 1.0 (see <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt">LICENSE_1_0.txt</a>).</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
</body>
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