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431 lines
22 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="generator" content="Docutils 0.3.9: http://docutils.sourceforge.net/" />
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<title>Boost Pointer Container Library</title>
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<link rel="stylesheet" href="default.css" type="text/css" />
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</head>
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<body>
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<div class="document" id="boost-pointer-container-library">
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<h1 class="title"><img alt="Boost" src="boost.png" /> Pointer Container Library</h1>
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<div class="section" id="class-reversible-ptr-container">
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<h1><a name="class-reversible-ptr-container">Class <tt class="docutils literal"><span class="pre">reversible_ptr_container</span></tt></a></h1>
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<p>This class is not a real class that can be found in the library.
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Its purpose is to present the general interface of all the pointer containers.</p>
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<p><strong>Navigate:</strong></p>
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<ul class="simple">
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<li><a class="reference" href="ptr_container.html">home</a></li>
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<li><a class="reference" href="reference.html">reference</a></li>
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</ul>
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<p><strong>synopsis:</strong></p>
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<pre class="literal-block">
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namespace boost
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{
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template
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<
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class T,
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class CloneAllocator,
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class VoidPtrContainer
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>
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class reversible_ptr_container
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{
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public: // <a class="reference" href="#typedefs">typedefs</a>
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typedef T* value_type;
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typedef T& reference;
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typedef const T& const_reference;
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typedef <em>implementation defined</em> iterator;
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typedef <em>implementation defined</em> const_iterator;
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typedef typename VoidPtrContainer::differnce_type difference_type;
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typedef typename VoidPtrContainer::size_type size_type;
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typedef typename VoidPtrContainer::allocator_type allocator_type;
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typedef <em>implementation defined</em> reverse_iterator;
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typedef <em>implementation defined</em> const_reverse_iterator;
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typedef <em>implementation defined</em> auto_type;
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public: // <a class="reference" href="#construct-copy-destroy">construct/copy/destroy</a>
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reversible_ptr_container();
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reversible_ptr_container( auto_ptr<reversible_ptr_container> r );
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template< class InputIterator >
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reversible_ptr_container( InputIterator first, InputIterator last );
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~reversible_ptr_container();
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void operator=( std::auto_ptr<reversible_ptr_container> r )
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allocator_type get_allocator() const;
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public: // <a class="reference" href="#iterators">iterators</a>
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iterator begin();
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const_iterator begin() const;
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iterator end();
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const_iterator end() const;
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reverse_iterator rbegin();
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const_reverse_iterator rbegin() const;
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reverse_iterator rend();
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const_reverse_iterator rend() const;
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public: // <a class="reference" href="#capacity">capacity</a>
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size_type size() const;
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size_type max_size() const;
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bool empty() const;
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public: // <a class="reference" href="#modifiers">modifiers</a>
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void swap( reversible_ptr_container& r );
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void clear():
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public: // <a class="reference" href="#pointer-container-requirements">pointer container requirements</a>
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auto_type replace( iterator position, T* x );
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std::auto_ptr<reversible_ptr_container> clone() const;
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std::auto_ptr<reversible_ptr_container> release();
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auto_type release( iterator position );
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}; // class 'reversible_ptr_container'
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// <a class="reference" href="#comparison">comparison</a>
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template < class T, class CA, class VPC >
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bool operator==( const reversible_ptr_container<T,CA,VPC>& x,
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const reversible_ptr_container<T,CA,VPC>& y);
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template < class T, class CA, class VPC >
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bool operator<( const reversible_ptr_container<T,CA,VPC>& x,
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const reversible_ptr_container<T,CA,VPC>& y);
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template < class T, class CA, class VPC >
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bool operator!=( const reversible_ptr_container<T,CA,VPC>& x,
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const reversible_ptr_container<T,CA,VPC>& y);
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template < class T, class CA, class VPC >
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bool operator>( const reversible_ptr_container<T,CA,VPC>& x,
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const reversible_ptr_container<T,CA,VPC>& y);
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template < class T, class CA, class VPC >
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bool operator>=( const reversible_ptr_container<T,CA,VPC>& x,
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const reversible_ptr_container<T,CA,VPC>& y);
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template < class T, class CA, class VPC >
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bool operator<=( const reversible_ptr_container<T,CA,VPC>& x,
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const reversible_ptr_container<T,CA,VPC>& y);
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template< class T, class CA, class VPC >
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void swap( reversible_ptr_container<T,CA,VPC>& x,
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reversible_ptr_container<T,CA,VPC>& y );
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// <a class="reference" href="#clonability">clonability</a>
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template< class T, class CA, class VPC >
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reversible_ptr_container<T,CA,VPC>*
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new_clone( const reversible_ptr_container<T,CA,VPC>& r );
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// <a class="reference" href="#null-predicate">null predicate</a>
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template< class Iterator >
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bool is_null( Iterator i );
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} // namespace 'boost'
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</pre>
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</div>
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<div class="section" id="semantics">
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<h1><a name="semantics">Semantics</a></h1>
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<span id="typedefs"></span><div class="section" id="semantics-typedefs">
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<h2><a name="semantics-typedefs">Semantics: typedefs</a></h2>
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<p>Notice how these two types differ:</p>
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<ul>
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<li><p class="first"><tt class="docutils literal"><span class="pre">typedef</span> <span class="pre">T*</span> <span class="pre">value_type;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>notice this has pointer type</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">typedef</span> <span class="pre">T&</span> <span class="pre">reference;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>notice this is not a pointer type</li>
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</ul>
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</blockquote>
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</li>
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</ul>
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<p>This is done to be able to add pointers directly
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to the container, but to hide the pointers externally.</p>
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<!-- - ``typedef *implementation defined* object_type;``
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- this is ``T`` for sequences and sets
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- this is ``std::pair<const Key, void*>`` for maps -->
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<p>Also notice that</p>
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<ul class="simple">
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<li><tt class="docutils literal"><span class="pre">typedef</span> <span class="pre">...</span> <span class="pre">iterator</span></tt></li>
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</ul>
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<p>allows one to iterate over <tt class="docutils literal"><span class="pre">T&</span></tt> objects, not <tt class="docutils literal"><span class="pre">T*</span></tt>.
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Note that:</p>
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<pre class="literal-block">
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iterator i = ...;
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i.base();
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</pre>
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<p>returns an iterator that allows one to iterate over <tt class="docutils literal"><span class="pre">void*</span></tt>
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elements (<em>this is very rarely needed and you should not use the
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functionality unless you know what you are doing</em>).</p>
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<ul class="simple">
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<li><tt class="docutils literal"><span class="pre">typedef</span> <span class="pre">...</span> <span class="pre">auto_type</span></tt></li>
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</ul>
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<p>This declaration hides a pointer pointer type. You can rely on the following
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operations:</p>
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<pre class="literal-block">
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T* operator->() const;
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T& operator*() const;
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T* release();
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~auto_type();
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</pre>
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<p>The destructor will delete the stored object. It might help to
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think it is just an <tt class="docutils literal"><span class="pre">std::auto_ptr<T></span></tt>.</p>
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</div>
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<span id="construct-copy-destroy"></span><div class="section" id="semantics-construct-copy-destroy">
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<h2><a name="semantics-construct-copy-destroy">Semantics: construct/copy/destroy</a></h2>
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<ul>
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<li><p class="first"><tt class="docutils literal"><span class="pre">reversible_ptr_container();</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Constructs an empty container</li>
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<li>Postconditions: <tt class="docutils literal"><span class="pre">size()</span> <span class="pre">==</span> <span class="pre">0</span></tt></li>
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</ul>
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</blockquote>
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</li>
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</ul>
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<!-- - ``reversible_ptr_container( size_type n, const T& x );``
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- Effects: Constructs a container with ``n`` clones of ``x``
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- Postconditions: ``size() == n`` -->
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<ul>
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<li><p class="first"><tt class="docutils literal"><span class="pre">explicit</span> <span class="pre">reversible_ptr_container(</span> <span class="pre">std::auto_ptr<</span> <span class="pre">reversible_ptr_container</span> <span class="pre">></span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Constructs a container by taking ownership of the supplied pointers</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">template<</span> <span class="pre">class</span> <span class="pre">InputIterator</span> <span class="pre">></span></tt>
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<tt class="docutils literal"><span class="pre">reversible_ptr_container(</span> <span class="pre">InputIterator</span> <span class="pre">first,</span> <span class="pre">InputIterator</span> <span class="pre">last</span> <span class="pre">);</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Requirements: <tt class="docutils literal"><span class="pre">(first,last]</span></tt> is a valid range</li>
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<li>Effects: Constructs a container with a cloned range of <tt class="docutils literal"><span class="pre">(first,last]</span></tt></li>
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<li>Postconditions: <tt class="docutils literal"><span class="pre">size()</span> <span class="pre">==</span> <span class="pre">std::distance(</span> <span class="pre">first,</span> <span class="pre">last</span> <span class="pre">)</span></tt></li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">~reversible_ptr_container();</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Deletes the stored objects</li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">operator=(</span> <span class="pre">std::auto_ptr<reversible_ptr_container></span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Deletes the stored objects and then takes ownership of the supplied pointers</li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">allocator_type</span> <span class="pre">get_allocator()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns a copy of the allocator of the container object</li>
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</ul>
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</blockquote>
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</li>
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</ul>
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</div>
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<span id="iterators"></span><div class="section" id="semantics-iterators">
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<h2><a name="semantics-iterators">Semantics: iterators</a></h2>
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<p><strong>See also:</strong> <a class="reference" href="conventions.html#iterators-are-invalidated-as-in-the-corresponding-standard-container">iterator invalidation</a></p>
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<ul>
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<li><p class="first"><tt class="docutils literal"><span class="pre">iterator</span> <span class="pre">begin();</span></tt></p>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">const_iterator</span> <span class="pre">begin()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns a mutable/non-mutable iterator with <tt class="docutils literal"><span class="pre">value_type</span> <span class="pre">T</span></tt></li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">iterator</span> <span class="pre">end();</span></tt></p>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">const_iterator</span> <span class="pre">end()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns a mutable/non-mutable iterator with <tt class="docutils literal"><span class="pre">value_type</span> <span class="pre">T</span></tt></li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">reverse_iterator</span> <span class="pre">rbegin();</span></tt></p>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">const_reverse_iterator</span> <span class="pre">rbegin()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns a mutable/non-mutable reverse iterator with <tt class="docutils literal"><span class="pre">value_type</span> <span class="pre">T</span></tt></li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">reverse_iterator</span> <span class="pre">rend();</span></tt></p>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">const_reverse_iterator</span> <span class="pre">rend()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns a mutable/non-mutable reverse iterator with <tt class="docutils literal"><span class="pre">value_type</span> <span class="pre">T</span></tt></li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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</ul>
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</div>
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<span id="capacity"></span><div class="section" id="semantics-capacity">
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<h2><a name="semantics-capacity">Semantics: capacity</a></h2>
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<ul>
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<li><p class="first"><tt class="docutils literal"><span class="pre">size_type</span> <span class="pre">size()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns the number of stored elements</li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">size_type</span> <span class="pre">max_size()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns the maximum number of stored elements</li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">bool</span> <span class="pre">empty()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns whether the container is empty or not</li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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</ul>
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</div>
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<span id="modifiers"></span><div class="section" id="semantics-modifiers">
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<h2><a name="semantics-modifiers">Semantics: modifiers</a></h2>
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<ul>
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<li><p class="first"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">swap(</span> <span class="pre">reversible_ptr_container&</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Swaps the content of the two containers</li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">clear();</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Destroys all object of the container</li>
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<li>Postconditions: <tt class="docutils literal"><span class="pre">empty()</span> <span class="pre">==</span> <span class="pre">true</span></tt></li>
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<li>Throws: Nothing</li>
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</ul>
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</blockquote>
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</li>
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</ul>
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</div>
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<span id="pointer-container-requirements"></span><div class="section" id="semantics-pointer-container-requirements">
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<h2><a name="semantics-pointer-container-requirements">Semantics: pointer container requirements</a></h2>
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<ul>
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<li><p class="first"><tt class="docutils literal"><span class="pre">auto_type</span> <span class="pre">replace(</span> <span class="pre">iterator</span> <span class="pre">position,</span> <span class="pre">T*</span> <span class="pre">x</span> <span class="pre">);</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Requirements: <tt class="docutils literal"><span class="pre">not</span> <span class="pre">empty()</span> <span class="pre">and</span> <span class="pre">x</span> <span class="pre">!=</span> <span class="pre">0</span></tt></li>
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<li>Effects: returns the object pointed to by <tt class="docutils literal"><span class="pre">position</span></tt> and replaces it with <tt class="docutils literal"><span class="pre">x</span></tt>.</li>
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<li>Throws: <tt class="docutils literal"><span class="pre">bad_ptr_container_operation</span></tt> if the container is empty and <tt class="docutils literal"><span class="pre">bad_pointer</span></tt> if <tt class="docutils literal"><span class="pre">x</span> <span class="pre">==</span> <span class="pre">0</span></tt>.</li>
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<li>Exception safety: Strong guarantee</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">std::auto_ptr<</span> <span class="pre">reversible_ptr_container</span> <span class="pre">></span> <span class="pre">clone()</span> <span class="pre">const;</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Returns a deep copy of the container</li>
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<li>Throws: <tt class="docutils literal"><span class="pre">std::bad_alloc</span></tt> if there is not enough memory to make a clone of the container</li>
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<li>Complexity: Linear</li>
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</ul>
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</blockquote>
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</li>
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<li><p class="first"><tt class="docutils literal"><span class="pre">std::auto_ptr<</span> <span class="pre">reversible_ptr_container</span> <span class="pre">></span> <span class="pre">release();</span></tt></p>
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<blockquote>
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<ul class="simple">
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<li>Effects: Releases ownership of the container. This is a useful way of returning a container from a function.</li>
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<li>Postconditions: <tt class="docutils literal"><span class="pre">empty()</span> <span class="pre">==</span> <span class="pre">true</span></tt></li>
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<li>Throws: <tt class="docutils literal"><span class="pre">std::bad_alloc</span></tt> if the return value cannot be allocated</li>
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<li>Exception safety: Strong guarantee</li>
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|
</ul>
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|
</blockquote>
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</li>
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|
<li><p class="first"><tt class="docutils literal"><span class="pre">auto_type</span> <span class="pre">release(</span> <span class="pre">iterator</span> <span class="pre">position</span> <span class="pre">);</span></tt></p>
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<blockquote>
|
|
<ul class="simple">
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|
<li>Requirements: <tt class="docutils literal"><span class="pre">not</span> <span class="pre">empty();</span></tt></li>
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|
<li>Effects: Releases ownership of the pointer referred to by position</li>
|
|
<li>Postconditions: <tt class="docutils literal"><span class="pre">size()</span></tt> is one less</li>
|
|
<li>Throws: <tt class="docutils literal"><span class="pre">bad_ptr_container_operation</span></tt> if the container is empty</li>
|
|
<li>Exception safety: Strong guarantee</li>
|
|
</ul>
|
|
</blockquote>
|
|
</li>
|
|
</ul>
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</div>
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<span id="comparison"></span><div class="section" id="semantics-comparison">
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<h2><a name="semantics-comparison">Semantics: comparison</a></h2>
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|
<p>These functions compare the underlying range of objects.
|
|
So</p>
|
|
<pre class="literal-block">
|
|
operation( const ptr_container& l, const ptr_container& r );
|
|
</pre>
|
|
<p>has the effect one would expect of normal standard containers. Hence
|
|
objects are compared and not the pointers to objects.</p>
|
|
</div>
|
|
<span id="clonability"></span><div class="section" id="semantics-clonability">
|
|
<h2><a name="semantics-clonability">Semantics: clonability</a></h2>
|
|
<ul>
|
|
<li><p class="first"><tt class="docutils literal"><span class="pre">template<</span> <span class="pre">class</span> <span class="pre">T,</span> <span class="pre">class</span> <span class="pre">CloneAllocator</span> <span class="pre">></span>
|
|
<span class="pre">reversible_ptr_container<T,CA,VPC>*</span>
|
|
<span class="pre">new_clone(</span> <span class="pre">const</span> <span class="pre">reversible_ptr_container<T,CA,VPC>&</span> <span class="pre">r</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">r.clone().release();</span></tt></li>
|
|
<li>Remarks: This function is only defined for concrete <a class="reference" href="ptr_container.html#smart-containers">pointer containers</a>, but not for
|
|
<a class="reference" href="ptr_container.html#smart-container-adapters">pointer container adapters</a>.</li>
|
|
</ul>
|
|
</blockquote>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<span id="null-predicate"></span><div class="section" id="semantics-null-predicate">
|
|
<h2><a name="semantics-null-predicate">Semantics: null predicate</a></h2>
|
|
<ul>
|
|
<li><p class="first"><tt class="docutils literal"><span class="pre">template<</span> <span class="pre">class</span> <span class="pre">Iterator</span> <span class="pre">></span> <span class="pre">bool</span> <span class="pre">is_null(</span> <span class="pre">Iterator</span> <span class="pre">i</span> <span class="pre">);</span></tt></p>
|
|
<blockquote>
|
|
<ul class="simple">
|
|
<li>Requirements: <tt class="docutils literal"><span class="pre">i</span></tt> is a valid dereferencable iterator</li>
|
|
<li>Returns: <tt class="docutils literal"><span class="pre">*i.base()</span> <span class="pre">==</span> <span class="pre">0;</span></tt></li>
|
|
</ul>
|
|
</blockquote>
|
|
</li>
|
|
</ul>
|
|
<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 2004-2005.</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
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