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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">
<h1><a id="class-ptr-array" name="class-ptr-array">Class <tt class="docutils literal"><span class="pre">ptr_array</span></tt></a></h1>
<p>A <tt class="docutils literal"><span class="pre">ptr_array&lt;T,size&gt;</span></tt> is a pointer container that uses an underlying <tt class="docutils literal"><span class="pre">boost::array&lt;void*,size&gt;</span></tt>
to store the pointers. The class is useful when there is no requirement
of dynamic expansion and when no overhead is tolerable.</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="ptr_sequence_adapter.html">ptr_sequence_adapter</a><ul>
<li><a class="reference" href="ptr_vector.html">ptr_vector</a></li>
<li><a class="reference" href="ptr_list.html">ptr_list</a></li>
<li><a class="reference" href="ptr_deque.html">ptr_deque</a></li>
<li><tt class="docutils literal"><span class="pre">ptr_array</span></tt></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
    &lt; 
        class T, 
        size_t N, 
        CloneAllocator = heap_clone_allocator
    &gt;
    class ptr_array : public <em>implementation-defined</em>
    {
    public: // <a class="reference" href="#construct-copy-destroy">construct/copy/destroy</a>
        ptr_array();
        explicit ptr_array( const ptr_array&amp; r );
        template&lt; class U &gt;
        explicit ptr_array( const ptr_array&lt;U,N&gt;&amp; r );                
        explicit ptr_array( std::auto_ptr&lt;ptr_array&gt;&amp; r );
        
        ptr_array&amp; operator=( const ptr_array&amp; r );
        template&lt; class U &gt;
        ptr_array&amp; operator=( const ptr_array&lt;U,N&gt;&amp; r );
        ptr_array&amp; operator=( std::auto_ptr&lt;this_type&gt; r );

    public: // <a class="reference" href="reversible_ptr_container.html#iterators">iterators</a>

    public: // <a class="reference" href="reversible_ptr_container.html#capacity">capacity</a>

    public: // <a class="reference" href="#element-access">element access</a>
        T&amp;        front();
        const T&amp;  front() const;
        T&amp;        back();
        const T&amp;  back() const;
        
        template&lt; size_t idx &gt;
        T&amp;        at();
        template&lt; size_t idx &gt;
        const T&amp;  at() const;
        T&amp;        at( size_t );
        const T&amp;  at( size_t );

        T&amp;        operator[]( size_t );
        const T&amp;  operator[]( size_t ) const;

    public: // <a class="reference" href="#modifiers">modifiers</a>
        void  swap( ptr_array&amp; r );

        template&lt; size_t idx &gt;
        auto_type replace( T* r );
        template&lt; size_t idx, class U &gt;
        auto_type replace( std::auto_ptr&lt;U&gt; r );
        auto_type replace( size_t idx, T* r );
        template&lt; class U &gt;
        auto_type replace( size_t idx, std::auto_ptr&lt;U&gt; r );

    public: // <a class="reference" href="#pointer-container-requirements">pointer container requirements</a>
        std::auto_ptr&lt;ptr_array&gt;  clone() const;    
        std::auto_ptr&lt;ptr_array&gt;  release();
        template&lt; size_t idx &gt;
        bool                      is_null() const;
        bool                      is_null( size_t idx ) const;
     
    }; //  class 'ptr_sequence_adapter'

} // namespace 'boost'  
</pre>
</div>
<div class="section">
<h1><a id="semantics" name="semantics">Semantics</a></h1>
<div class="section">
<h2><a id="semantics-construct-copy-destroy" name="semantics-construct-copy-destroy"><span id="construct-copy-destroy"></span>Semantics: construct/copy/destroy</a></h2>
<ul>
<li><p class="first"><tt class="docutils literal"><span class="pre">ptr_array();</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: constructs array where each element is null</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">explicit</span> <span class="pre">ptr_array(</span> <span class="pre">const</span> <span class="pre">ptr_array&amp;</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template&lt;</span> <span class="pre">class</span> <span class="pre">U</span> <span class="pre">&gt;</span>
<span class="pre">explicit</span> <span class="pre">ptr_array(</span> <span class="pre">const</span> <span class="pre">ptr_array&lt;U,N&gt;&amp;</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
<ul class="simple">
<li>Effects: Constructs array by cloning <tt class="docutils literal"><span class="pre">r</span></tt></li>
</ul>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">ptr_array(</span> <span class="pre">std::auto_ptr&lt;ptr_array&gt;&amp;</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: take ownership of the supplied pointers</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">ptr_array&amp;</span> <span class="pre">operator=(</span> <span class="pre">const</span> <span class="pre">ptr_array&amp;</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template&lt;</span> <span class="pre">class</span> <span class="pre">U</span> <span class="pre">&gt;</span> <span class="pre">ptr_array&amp;</span> <span class="pre">operator=(</span> <span class="pre">const</span> <span class="pre">ptr_array&lt;U,N&gt;&amp;</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: Assigns a clone of <tt class="docutils literal"><span class="pre">r</span></tt></li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">ptr_array&amp;</span> <span class="pre">operator=(</span> <span class="pre">std::auto_ptr&lt;this_type&gt;</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: take ownership of the supplied pointers</li>
<li>Throws: Nothing</li>
</ul>
</blockquote>
</li>
</ul>
</div>
<div class="section">
<h2><a id="semantics-element-access" name="semantics-element-access"><span id="element-access"></span>Semantics: element access</a></h2>
<ul>
<li><p class="first"><tt class="docutils literal"><span class="pre">T&amp;</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span class="pre">front();</span></tt></p>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&amp;</span> <span class="pre">front()</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">not</span> <span class="pre">empty();</span></tt></li>
<li>Effects: <tt class="docutils literal"><span class="pre">return</span> <span class="pre">*begin();</span></tt></li>
<li>Throws: <tt class="docutils literal"><span class="pre">bad_ptr_container_operation</span></tt> if <tt class="docutils literal"><span class="pre">empty()</span> <span class="pre">==</span> <span class="pre">true</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">T&amp;</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span class="pre">back();</span></tt></p>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&amp;</span> <span class="pre">back()</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">not</span> <span class="pre">empty();</span></tt></li>
<li>Effects: <tt class="docutils literal"><span class="pre">return</span> <span class="pre">*--end();</span></tt></li>
<li>Throws: <tt class="docutils literal"><span class="pre">bad_ptr_container_operation</span></tt> if <tt class="docutils literal"><span class="pre">empty()</span> <span class="pre">==</span> <span class="pre">true</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template&lt;</span> <span class="pre">size_t</span> <span class="pre">idx</span> <span class="pre">&gt;</span> <span class="pre">T&amp;</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span class="pre">at(</span> <span class="pre">size_type</span> <span class="pre">n</span> <span class="pre">);</span></tt></p>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template&lt;</span> <span class="pre">size_t</span> <span class="pre">idx</span> <span class="pre">&gt;</span> <span class="pre">const</span> <span class="pre">T&amp;</span> <span class="pre">at(</span> <span class="pre">size_type</span> <span class="pre">n</span> <span class="pre">)</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">idx</span> <span class="pre">&lt;</span> <span class="pre">size()</span></tt> (compile-time enforced)</li>
<li>Effects: Returns a reference to the <tt class="docutils literal"><span class="pre">n</span></tt>'th element</li>
<li>Throws: nothing</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">T&amp;</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span class="pre">at(</span> <span class="pre">size_type</span> <span class="pre">n</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&amp;</span> <span class="pre">at(</span> <span class="pre">size_type</span> <span class="pre">n</span> <span class="pre">)</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">n</span> <span class="pre">&lt;</span> <span class="pre">size()</span></tt></li>
<li>Effects: Returns a reference to the <tt class="docutils literal"><span class="pre">n</span></tt>'th element</li>
<li>Throws: <tt class="docutils literal"><span class="pre">bad_index</span></tt> if <tt class="docutils literal"><span class="pre">n</span> <span class="pre">&gt;=size()</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">T&amp;</span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span class="pre">operator[](</span> <span class="pre">size_type</span> <span class="pre">n</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&amp;</span> <span class="pre">operator[](</span> <span class="pre">size_type</span> <span class="pre">n</span> <span class="pre">)</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">n</span> <span class="pre">&lt;</span> <span class="pre">size()</span></tt></li>
<li>Effects: Returns a reference to the <tt class="docutils literal"><span class="pre">n</span></tt>'th element</li>
<li>Throws: Nothing</li>
</ul>
</blockquote>
</li>
</ul>
</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">void</span> <span class="pre">swap(</span> <span class="pre">ptr_array&amp;</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: swaps the two arrays</li>
<li>Complexity: Linear</li>
<li>Throws: nothing</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template&lt;</span> <span class="pre">size_t</span> <span class="pre">idx</span> <span class="pre">&gt;</span> <span class="pre">auto_type</span> <span class="pre">replace(</span> <span class="pre">T*</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul>
<li><p class="first">Requirements:</p>
<blockquote>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">idx</span> <span class="pre">&lt;</span> <span class="pre">size()</span></tt> (compile-time enforced)</li>
<li><tt class="docutils literal"><span class="pre">r</span> <span class="pre">!=</span> <span class="pre">0</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first">Effects: returns the object indexed by <tt class="docutils literal"><span class="pre">idx</span></tt> and replaces it with <tt class="docutils literal"><span class="pre">r</span></tt>.</p>
</li>
<li><p class="first">Throws: <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>.</p>
</li>
<li><p class="first">Exception safety: Strong guarantee</p>
</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template&lt;</span> <span class="pre">size_t</span> <span class="pre">idx,</span> <span class="pre">class</span> <span class="pre">U</span> <span class="pre">&gt;</span> <span class="pre">auto_type</span> <span class="pre">replace(</span> <span class="pre">std::auto_ptr&lt;U&gt;</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">replace&lt;idx&gt;(</span> <span class="pre">r.release()</span> <span class="pre">);</span></tt></li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">auto_type</span> <span class="pre">replace(</span> <span class="pre">size_t</span> <span class="pre">idx,</span> <span class="pre">T*</span> <span class="pre">r</span> <span class="pre">);</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: `` x != 0 and idx &lt; size()``</li>
<li>Effects: returns the object indexed by <tt class="docutils literal"><span class="pre">idx</span></tt> and replaces it with <tt class="docutils literal"><span class="pre">x</span></tt>.</li>
<li>Throws: <tt class="docutils literal"><span class="pre">bad_index</span></tt> if <tt class="docutils literal"><span class="pre">idx</span> <span class="pre">&gt;=</span> <span class="pre">size()</span></tt> 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>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template&lt;</span> <span class="pre">class</span> <span class="pre">U</span> <span class="pre">&gt;</span> <span class="pre">auto_type</span> <span class="pre">replace(</span> <span class="pre">size_t</span> <span class="pre">idx,</span> <span class="pre">std::auto_ptr&lt;U&gt;</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">replace(</span> <span class="pre">idx,</span> <span class="pre">r.release()</span> <span class="pre">);</span></tt></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">std::auto_ptr&lt;ptr_array&gt;</span>&nbsp; <span class="pre">clone()</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: Returns a deep copy of the container</li>
<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>
<li>Complexity: Linear</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">std::auto_ptr&lt;ptr_array&gt;</span>&nbsp; <span class="pre">release();</span></tt></p>
<blockquote>
<ul class="simple">
<li>Effects: Releases ownership of the container. This is a useful way of returning a container from a function.</li>
<li>Postconditions: <tt class="docutils literal"><span class="pre">empty()</span> <span class="pre">==</span> <span class="pre">true</span></tt> and all pointers are null</li>
<li>Throws: <tt class="docutils literal"><span class="pre">std::bad_alloc</span></tt> if the return value cannot be allocated</li>
<li>Exception safety: Strong guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">template&lt;</span> <span class="pre">size_t</span> <span class="pre">idx</span> <span class="pre">&gt;</span> <span class="pre">bool</span> <span class="pre">is_null()</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">idx</span> <span class="pre">&lt;</span> <span class="pre">size()</span></tt> (compile-time enforced)</li>
<li>Effects: returns whether the pointer at index <tt class="docutils literal"><span class="pre">idx</span></tt> is null</li>
<li>Exception safety: Nothrow guarantee</li>
</ul>
</blockquote>
</li>
<li><p class="first"><tt class="docutils literal"><span class="pre">bool</span> <span class="pre">is_null(</span> <span class="pre">size_type</span> <span class="pre">idx</span> <span class="pre">)</span> <span class="pre">const;</span></tt></p>
<blockquote>
<ul class="simple">
<li>Requirements: <tt class="docutils literal"><span class="pre">idx</span> <span class="pre">&lt;</span> <span class="pre">size()</span></tt></li>
<li>Effects: returns whether the pointer at index <tt class="docutils literal"><span class="pre">idx</span></tt> is null</li>
<li>Exception safety: Nothrow guarantee</li>
</ul>
</blockquote>
</li>
</ul>
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<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>
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