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<div class="document" id="boost-pointer-container-library">
<h1 class="title"><img alt="Boost" src="boost.png" /> Pointer Container Library</h1>
<div class="section">
<h1><a id="class-ptr-map-adapter" name="class-ptr-map-adapter">Class <tt class="docutils literal"><span class="pre">ptr_map_adapter</span></tt></a></h1>
<p>This class is used to build custom pointer containers with
an underlying map-like container. The interface of the class is an extension
of the interface from <tt class="docutils literal"><span class="pre">associative_ptr_container</span></tt>.</p>
<p><strong>Hierarchy:</strong></p>
<ul class="simple">
<li><a class="reference" href="reversible_ptr_container.html">reversible_ptr_container</a><ul>
<li><a class="reference" href="associative_ptr_container.html">associative_ptr_container</a><ul>
<li><a class="reference" href="ptr_set_adapter.html">ptr_set_adapter</a></li>
<li><a class="reference" href="ptr_multiset_adapter.html">ptr_multiset_adapter</a></li>
<li><tt class="docutils literal"><span class="pre">ptr_map_adapter</span></tt></li>
<li><a class="reference" href="ptr_multimap_adapter.html">ptr_multi_map_adapter</a><ul>
<li><a class="reference" href="ptr_set.html">ptr_set</a></li>
<li><a class="reference" href="ptr_multiset.html">ptr_multi_set</a></li>
<li><a class="reference" href="ptr_map.html">ptr_map</a></li>
<li><a class="reference" 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" href="ptr_container.html">home</a></li>
<li><a class="reference" href="reference.html">reference</a></li>
</ul>
<p><strong>Synopsis:</strong></p>
<pre class="literal-block">
namespace boost
{
template
<
class T,
class VoidPtrMap,
class CloneAllocator = heap_clone_allocator
>
class ptr_map_adapter
{
public: // <a class="reference" href="#typedefs">typedefs</a>
typedef VoidPtrMap::key_type key_type;
typedef T* mapped_type;
typedef T& mapped_reference;
typedef const T& const_mapped_reference;
typedef ... value_type;
typedef ... reference;
typedef ... const_reference;
typedef ... pointer;
typedef ... const_pointer;
public: // <a class="reference" href="#modifiers">modifiers</a>
std::pair<iterator,bool> insert( key_type& k, T* x );
template< class U >
std::pair<iterator,bool> insert( const key_type& k, std::auto_ptr<U> x );
public; // <a class="reference" href="#lookup">lookup</a>
T& operator[]( const key_type& key );
T& at( const key_type& key );
const T& at( const key_type& key ) const;
public: // <a class="reference" href="#pointer-container-requirements">pointer container requirements</a>
bool transfer( iterator object, ptr_map_adapter& from );
size_type transfer( iterator first, iterator last, ptr_map_adapter& from );
template< class Range >
size_type transfer( const Range& r, ptr_map_adapter& from );
size_type transfer( ptr_map_adapter& from );
}; // class 'ptr_map_adapter'
} // namespace 'boost'
</pre>
</div>
<div class="section">
<h1><a id="semantics" name="semantics">Semantics</a></h1>
<div class="section">
<h2><a id="semantics-typedefs" name="semantics-typedefs"><span id="typedefs"></span>Semantics: typedefs</a></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"><span class="pre">first</span></tt> and <tt class="docutils literal"><span class="pre">second</span></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->foo();
map_type::reference a_reference = *m.begin();
a_reference.second->foo();
map_type::const_reference a_creference = *const_begin(m);
map_type::pointer a_pointer = &*m.begin();
a_pointer->second->foo();
map_type::const_pointer a_cpointer = &*const_begin(m);
</pre>
<p>The difference compared to <tt class="docutils literal"><span class="pre">std::map<Key,T*></span></tt> is that constness
is propagated to the pointer (that is, to <tt class="docutils literal"><span class="pre">second</span></tt>) in <tt class="docutils literal"><span class="pre">const_itertor</span></tt>.</p>
</div>
<div class="section">
<h2><a id="semantics-modifiers" name="semantics-modifiers"><span id="modifiers"></span>Semantics: modifiers</a></h2>
<ul>
<li><p class="first"><tt class="docutils literal"><span class="pre">std::pair<iterator,bool></span> <span class="pre">insert(</span> <span class="pre">key_type&</span> <span class="pre">k,</span> <span class="pre">value_type</span> <span class="pre">x</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">x</span> <span class="pre">!=</span> <span class="pre">0</span></tt></li>
<li>Effects: Takes ownership of <tt class="docutils literal"><span class="pre">x</span></tt> and insert it iff there is no equivalent of it already. The bool part of the return value indicates insertion and the iterator points to the element with key <tt class="docutils literal"><span class="pre">x</span></tt>.</li>
<li>Throws: bad_pointer if <tt class="docutils literal"><span class="pre">x</span> <span class="pre">==</span> <span class="pre">0</span></tt></li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template<</span> <span class="pre">class</span> <span class="pre">U</span> <span class="pre">></span> <span class="pre">std::pair<iterator,bool></span> <span class="pre">insert(</span> <span class="pre">const</span> <span class="pre">key_type&</span> <span class="pre">k,</span> <span class="pre">std::auto_ptr<U></span> <span class="pre">x</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Equivalent to (but without the <tt class="docutils literal"><span class="pre">const_cast</span></tt>): <tt class="docutils literal"><span class="pre">return</span> <span class="pre">insert(</span> <span class="pre">const_cast<key_type&>(k),</span> <span class="pre">x.release()</span> <span class="pre">);</span></tt></li>
</ul>
</blockquote>
</li>
</ul>
<!-- - ``std::pair<iterator,bool> insert( key_type& k, const_reference x );``
- Effects: ``return insert( allocate_clone( x ) );``
- Exception safety: Strong guarantee -->
</div>
<div class="section">
<h2><a id="semantics-lookup" name="semantics-lookup"><span id="lookup"></span>Semantics: lookup</a></h2>
<ul>
<li><p class="first"><tt class="docutils literal"><span class="pre">T&</span> <span class="pre">operator[](</span> <span class="pre">const</span> <span class="pre">key_type&</span> <span class="pre">key</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: returns the object with key <tt class="docutils literal"><span class="pre">key</span></tt> if it exists; otherwise a new object is allocated and inserted and its reference returned.</li>
<li>Exception-safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">T&</span> <span class="pre">at(</span> <span class="pre">const</span> <span class="pre">key_type&</span> <span class="pre">key</span> <span class="pre">);</span></tt></p>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&</span> <span class="pre">at(</span> <span class="pre">const</span> <span class="pre">key_type&</span> <span class="pre">jey</span> <span class="pre">)</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirement: the key exists</li>
<li>Throws: <tt class="docutils literal"><span class="pre">bad_ptr_container_operation</span></tt> if the key does not exist</li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section">
<h2><a id="semantics-pointer-container-requirements" name="semantics-pointer-container-requirements"><span id="pointer-container-requirements"></span>Semantics: pointer container requirements</a></h2>
<ul>
<li><p class="first"><tt class="docutils literal"><span class="pre">bool</span> <span class="pre">transfer(</span> <span class="pre">iterator</span> <span class="pre">object,</span> <span class="pre">ptr_map_adapter&</span> <span class="pre">from</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">not</span> <span class="pre">from.empty()</span></tt></li>
<li>Effects: Inserts the object defined by <tt class="docutils literal"><span class="pre">object</span></tt> into the container and remove it from <tt class="docutils literal"><span class="pre">from</span></tt>
iff no equivalent object exists.</li>
<li>Returns: whether the object was transfered</li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">size_type</span> <span class="pre">transfer(</span> <span class="pre">iterator</span> <span class="pre">first,</span> <span class="pre">iterator</span> <span class="pre">last,</span> <span class="pre">ptr__set_adapter&</span> <span class="pre">from</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">not</span> <span class="pre">from.empty()</span></tt></li>
<li>Effects: Inserts the objects defined by the range <tt class="docutils literal"><span class="pre">[first,last)</span></tt> into the container and remove it from <tt class="docutils literal"><span class="pre">from</span></tt>.
An object is only transferred if no equivalent object exists.</li>
<li>Returns: the number of transfered objects</li>
<li>Exception safety: Basic guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template<</span> <span class="pre">class</span> <span class="pre">Range</span> <span class="pre">></span> <span class="pre">void</span> <span class="pre">transfer(</span> <span class="pre">const</span> <span class="pre">Range&</span> <span class="pre">r,</span> <span class="pre">ptr_map_adapter&</span> <span class="pre">from</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal"><span class="pre">return</span> <span class="pre">transfer(</span> <span class="pre">boost::begin(r),</span> <span class="pre">boost::end(r),</span> <span class="pre">from</span> <span class="pre">);</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">size_type</span> <span class="pre">transfer(</span> <span class="pre">ptr_set_adapter&</span> <span class="pre">from</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: <tt class="docutils literal"><span class="pre">return</span> <span class="pre">transfer(</span> <span class="pre">from.begin(),</span> <span class="pre">from.end(),</span> <span class="pre">from</span> <span class="pre">);</span></tt>.</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" href="http://www.boost.org/LICENSE_1_0.txt">LICENSE_1_0.txt</a>).</td>
</tr>
</tbody>
</table>
</div>
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