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361</head>
362<body>
363<div class="document" id="boost-pointer-container-library">
364<h1 class="title"><img alt="Boost" src="boost.png" /> Pointer Container Library</h1>
365
366<div class="section" id="class-reversible-ptr-container">
367<h1>Class <tt class="docutils literal">reversible_ptr_container</tt></h1>
368<p>This class is not a real class that can be found in the library.
369Its purpose is to present the general interface of all the pointer containers.</p>
370<p><strong>Hierarchy:</strong></p>
371<ul class="simple">
372<li><tt class="docutils literal">reversible_ptr_container</tt><ul>
373<li><a class="reference external" href="ptr_sequence_adapter.html">ptr_sequence_adapter</a><ul>
374<li><a class="reference external" href="ptr_vector.html">ptr_vector</a></li>
375<li><a class="reference external" href="ptr_list.html">ptr_list</a></li>
376<li><a class="reference external" href="ptr_deque.html">ptr_deque</a></li>
377<li><a class="reference external" href="ptr_array.html">ptr_array</a></li>
378</ul>
379</li>
380<li><a class="reference external" href="associative_ptr_container.html">associative_ptr_container</a><ul>
381<li><a class="reference external" href="ptr_set_adapter.html">ptr_set_adapter</a></li>
382<li><a class="reference external" href="ptr_multiset_adapter.html">ptr_multiset_adapter</a></li>
383<li><a class="reference external" href="ptr_map_adapter.html">ptr_map_adapter</a></li>
384<li><a class="reference external" href="ptr_multimap_adapter.html">ptr_multi_map_adapter</a><ul>
385<li><a class="reference external" href="ptr_set.html">ptr_set</a></li>
386<li><a class="reference external" href="ptr_multiset.html">ptr_multi_set</a></li>
387<li><a class="reference external" href="ptr_map.html">ptr_map</a></li>
388<li><a class="reference external" href="ptr_multimap.html">ptr_multimap</a></li>
389</ul>
390</li>
391</ul>
392</li>
393</ul>
394</li>
395</ul>
396<p><strong>Navigate:</strong></p>
397<ul class="simple">
398<li><a class="reference external" href="ptr_container.html">home</a></li>
399<li><a class="reference external" href="reference.html">reference</a></li>
400</ul>
401<p><strong>synopsis:</strong></p>
402<pre class="literal-block">
403namespace boost
404{
405    template
406    &lt;
407        class T,
408        class CloneAllocator,
409        class VoidPtrContainer
410    &gt;
411    class reversible_ptr_container
412    {
413    public: // <a class="reference internal" href="#typedefs">typedefs</a>
414        typedef  T*                                           value_type;
415        typedef  T&amp;                                           reference;
416        typedef  const T&amp;                                     const_reference;
417        typedef  <em>implementation defined</em>                       iterator;
418        typedef  <em>implementation defined</em>                       const_iterator;
419        typedef  typename VoidPtrContainer::differnce_type    difference_type;
420        typedef  typename VoidPtrContainer::size_type         size_type;
421        typedef  typename VoidPtrContainer::allocator_type    allocator_type;
422        typedef  <em>implementation defined</em>                       reverse_iterator;
423        typedef  <em>implementation defined</em>                       const_reverse_iterator;
424        typedef  <em>implementation defined</em>                       auto_type;
425
426    public: // <a class="reference internal" href="#construct-copy-destroy">construct/copy/destroy</a>
427        reversible_ptr_container();
428        explicit reversible_ptr_container( const reversible_ptr_container&amp; r );
429        template&lt; class Derived &gt;
430        explicit reversible_ptr_container( const reversible_ptr_container&lt;Derived&gt;&amp; r );
431        explicit reversible_ptr_container( <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;reversible_ptr_container&gt; r );
432        template&lt; class InputIterator &gt;
433        reversible_ptr_container( InputIterator first, InputIterator last );
434
435        ~reversible_ptr_container();
436
437        reversible_ptr_container&amp;  operator=( const reversible_ptr_container&amp; r );
438        template&lt;class Derived&gt;
439        reversible_ptr_container&amp;  operator=( const reversible_ptr_container&lt;Derived&gt;&amp; r );
440        reversible_ptr_container&amp;  operator=( <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;reversible_ptr_container&gt; r );
441        allocator_type             get_allocator() const;
442
443    public: // <a class="reference internal" href="#iterators">iterators</a>
444        iterator                begin();
445        const_iterator          begin() const;
446        iterator                end();
447        const_iterator          end() const;
448        reverse_iterator        rbegin();
449        const_reverse_iterator  rbegin() const;
450        reverse_iterator        rend();
451        const_reverse_iterator  rend() const;
452
453    public: // <a class="reference internal" href="#capacity">capacity</a>
454        size_type  size() const;
455        size_type  max_size() const;
456        bool       empty() const;
457
458    public: // <a class="reference internal" href="#modifiers">modifiers</a>
459        void                     swap( reversible_ptr_container&amp; r );
460        void                     clear():
461        VoidPtrContainer&amp;        base();
462        const VoidPtrContainer&amp;  base() const;
463
464    public: // <a class="reference internal" href="#pointer-container-requirements">pointer container requirements</a>
465        auto_type                                replace( iterator position, T* x );
466        template&lt; class U &gt;
467        auto_type                                replace( iterator position, <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;U&gt; x );
468        <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;reversible_ptr_container&gt;  clone() const;
469        <a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;reversible_ptr_container&gt;  release();
470        auto_type                                release( iterator position );
471
472    }; //  class 'reversible_ptr_container'
473
474    // <a class="reference internal" href="#comparison">comparison</a>
475    template &lt; class T, class CA, class VPC &gt;
476    bool operator==( const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; x,
477                     const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; y);
478
479    template &lt; class T, class CA, class VPC  &gt;
480    bool operator&lt;( const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; x,
481                    const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; y);
482
483    template &lt; class T, class CA, class VPC  &gt;
484    bool operator!=( const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; x,
485                     const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; y);
486
487    template &lt; class T,  class CA, class VPC &gt;
488    bool operator&gt;( const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; x,
489                    const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; y);
490
491    template &lt; class T,  class CA, class VPC &gt;
492    bool operator&gt;=( const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; x,
493                     const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; y);
494
495    template &lt; class T,  class CA, class VPC &gt;
496    bool operator&lt;=( const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; x,
497                     const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; y);
498
499    template&lt; class T,  class CA, class VPC  &gt;
500    void swap( reversible_ptr_container&lt;T,CA,VPC&gt;&amp; x,
501               reversible_ptr_container&lt;T,CA,VPC&gt;&amp; y );
502
503    // <a class="reference internal" href="#cloneability">cloneability</a>
504    template&lt; class T,  class CA, class VPC &gt;
505    reversible_ptr_container&lt;T,CA,VPC&gt;*
506    new_clone( const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; r );
507
508    // <a class="reference internal" href="#null-predicate">null predicate</a>
509    template&lt; class Iterator &gt;
510    bool is_null( Iterator i );
511
512    // <a class="reference internal" href="#serialization">serialization</a>
513    template&lt;class Archive, class T, class CA, class VPC&gt;
514    void serialize( Archive&amp; ar, reversible_ptr_container&lt;T,CÁ,VPC&gt;&amp; c, const unsigned int version );
515
516
517} // namespace 'boost'
518</pre>
519</div>
520<div class="section" id="semantics">
521<h1>Semantics</h1>
522<div class="section" id="semantics-typedefs">
523<span id="typedefs"></span><h2>Semantics: typedefs</h2>
524<p>Notice how these two types differ:</p>
525<ul>
526<li><p class="first"><tt class="docutils literal">typedef T* value_type;</tt></p>
527<blockquote>
528<ul class="simple">
529<li>notice this has pointer type</li>
530</ul>
531</blockquote>
532</li>
533<li><p class="first"><tt class="docutils literal">typedef T&amp; reference;</tt></p>
534<blockquote>
535<ul class="simple">
536<li>notice this is not a pointer type</li>
537</ul>
538</blockquote>
539</li>
540</ul>
541<p>This is done to be able to add pointers directly
542to the container, but to hide the pointers externally.</p>
543<!-- - ``typedef *implementation defined* object_type;``
544- this is ``T`` for sequences and sets
545- this is ``std::pair<const Key, void*>`` for maps -->
546<p>Also notice that</p>
547<ul class="simple">
548<li><tt class="docutils literal">typedef ... iterator</tt></li>
549</ul>
550<p>allows one to iterate over <tt class="docutils literal">T&amp;</tt> objects, not <tt class="docutils literal">T*</tt>.
551Note that:</p>
552<pre class="literal-block">
553iterator i = ...;
554i.base();
555</pre>
556<p>returns an iterator that allows one to iterate over <tt class="docutils literal">void*</tt>
557elements (<em>this is very rarely needed and you should not use the
558functionality unless you know what you are doing</em>).</p>
559<ul class="simple">
560<li><tt class="docutils literal">typedef ... auto_type</tt></li>
561</ul>
562<p>This declaration hides a pointer pointer type. You can rely on the following
563operations</p>
564<pre class="literal-block">
565T* operator-&gt;() const;
566T&amp; operator*() const;
567T* release();
568~auto_type();
569operator <em>implementation-defined bool</em>();
570</pre>
571<p>The destructor will delete the stored object <em>using the clone allocator of the container</em>
572(this explains why we cannot use <tt class="docutils literal"><span class="pre">std::auto_ptr&lt;T&gt;</span></tt> nor <tt class="docutils literal"><span class="pre">std::unique_ptr&lt;T&gt;</span></tt>). It might help to
573think it is just a <tt class="docutils literal"><span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;T&gt;</span></tt>. You can also return
574the pointer from a function or assign it to another pointer via the <tt class="docutils literal">move()</tt>
575function</p>
576<pre class="literal-block">
577auto_type ptr   = ...;
578auto_type other = boost::ptr_container::move( ptr );
579return boost::ptr_container::move( other );
580</pre>
581</div>
582<div class="section" id="semantics-construct-copy-destroy">
583<span id="construct-copy-destroy"></span><h2>Semantics: construct/copy/destroy</h2>
584<ul>
585<li><p class="first"><tt class="docutils literal"><span class="pre">reversible_ptr_container();</span></tt></p>
586<blockquote>
587<ul class="simple">
588<li>Effects: Constructs an empty container</li>
589<li>Postconditions: <tt class="docutils literal">size() == 0</tt></li>
590</ul>
591</blockquote>
592</li>
593</ul>
594<!-- - ``reversible_ptr_container( size_type n, const T& x );``
595
596- Effects: Constructs a container with ``n`` clones of ``x``
597
598- Postconditions: ``size() == n`` -->
599<ul>
600<li><p class="first"><tt class="docutils literal">explicit reversible_ptr_container( const reversible_ptr_container&amp; r );</tt></p>
601<blockquote>
602<ul class="simple">
603<li>Effects: Constructs a container by cloning all elements of <tt class="docutils literal">r</tt></li>
604</ul>
605</blockquote>
606</li>
607<li><p class="first"><tt class="docutils literal">template&lt; class Derived &gt; explicit reversible_ptr_container( const reversible_ptr_container&lt;Derived&gt;&amp; r );</tt></p>
608<blockquote>
609<ul class="simple">
610<li>Effects: Constructs a container by cloning all elements of <tt class="docutils literal">r</tt></li>
611<li>Requirements: <tt class="docutils literal">Derived</tt> is derived from <tt class="docutils literal">T</tt></li>
612</ul>
613</blockquote>
614</li>
615<li><p class="first"><tt class="docutils literal">explicit reversible_ptr_container( <span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;</span> reversible_ptr_container &gt; r );</tt></p>
616<blockquote>
617<ul class="simple">
618<li>Effects: Constructs a container by taking ownership of the supplied pointers</li>
619</ul>
620</blockquote>
621</li>
622<li><p class="first"><tt class="docutils literal">template&lt; class InputIterator &gt;</tt>
623<tt class="docutils literal">reversible_ptr_container( InputIterator first, InputIterator last );</tt></p>
624<blockquote>
625<ul class="simple">
626<li>Requirements: <tt class="docutils literal">(first,last]</tt> is a valid range</li>
627<li>Effects: Constructs a container with a cloned range of <tt class="docutils literal">(first,last]</tt></li>
628<li>Postconditions: <tt class="docutils literal">size() == <span class="pre">std::distance(</span> first, last )</tt></li>
629</ul>
630</blockquote>
631</li>
632<li><p class="first"><tt class="docutils literal"><span class="pre">~reversible_ptr_container();</span></tt></p>
633<blockquote>
634<ul class="simple">
635<li>Effects: Deletes the stored objects via the clone allocator</li>
636<li>Throws: Nothing</li>
637</ul>
638</blockquote>
639</li>
640<li><p class="first"><tt class="docutils literal">reversible_ptr_container&amp; operator=( const reversible_ptr_container&amp; r );</tt></p>
641<blockquote>
642<ul class="simple">
643<li>Effects: Assigns a clone of <tt class="docutils literal">r</tt></li>
644<li>Exception safety: strong guarantee</li>
645</ul>
646</blockquote>
647</li>
648<li><p class="first"><tt class="docutils literal">template&lt;class Derived&gt; reversible_ptr_container&amp; operator=( const reversible_ptr_container&lt;Derived&gt;&amp; r );</tt></p>
649<blockquote>
650<ul class="simple">
651<li>Effects: Assigns a clone of <tt class="docutils literal">r</tt></li>
652<li>Requirements: <tt class="docutils literal">Derived</tt> is derived from <tt class="docutils literal">T</tt></li>
653<li>Exception safety: Strong guarantee</li>
654</ul>
655</blockquote>
656</li>
657<li><p class="first"><tt class="docutils literal">reversible_ptr_container&amp; operator=( <span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;reversible_ptr_container&gt;</span> r );</tt></p>
658<blockquote>
659<ul class="simple">
660<li>Effects: Deletes the stored objects and then takes ownership of the supplied pointers</li>
661<li>Throws: Nothing</li>
662</ul>
663</blockquote>
664</li>
665<li><p class="first"><tt class="docutils literal">allocator_type get_allocator() const;</tt></p>
666<blockquote>
667<ul class="simple">
668<li>Effects: Returns a copy of the allocator of the container object</li>
669</ul>
670</blockquote>
671</li>
672</ul>
673</div>
674<div class="section" id="semantics-iterators">
675<span id="iterators"></span><h2>Semantics: iterators</h2>
676<p><strong>See also:</strong> <a class="reference external" href="conventions.html#iterators-are-invalidated-as-in-the-corresponding-standard-container">iterator invalidation</a></p>
677<ul>
678<li><p class="first"><tt class="docutils literal">iterator <span class="pre">begin();</span></tt></p>
679</li>
680<li><p class="first"><tt class="docutils literal">const_iterator begin() const;</tt></p>
681<blockquote>
682<ul class="simple">
683<li>Effects: Returns a mutable/non-mutable iterator with <tt class="docutils literal">value_type T</tt></li>
684<li>Throws: Nothing</li>
685</ul>
686</blockquote>
687</li>
688<li><p class="first"><tt class="docutils literal">iterator <span class="pre">end();</span></tt></p>
689</li>
690<li><p class="first"><tt class="docutils literal">const_iterator end() const;</tt></p>
691<blockquote>
692<ul class="simple">
693<li>Effects: Returns a mutable/non-mutable iterator with <tt class="docutils literal">value_type T</tt></li>
694<li>Throws: Nothing</li>
695</ul>
696</blockquote>
697</li>
698<li><p class="first"><tt class="docutils literal">reverse_iterator <span class="pre">rbegin();</span></tt></p>
699</li>
700<li><p class="first"><tt class="docutils literal">const_reverse_iterator rbegin() const;</tt></p>
701<blockquote>
702<ul class="simple">
703<li>Effects: Returns a mutable/non-mutable reverse iterator with <tt class="docutils literal">value_type T</tt></li>
704<li>Throws: Nothing</li>
705</ul>
706</blockquote>
707</li>
708<li><p class="first"><tt class="docutils literal">reverse_iterator <span class="pre">rend();</span></tt></p>
709</li>
710<li><p class="first"><tt class="docutils literal">const_reverse_iterator rend() const;</tt></p>
711<blockquote>
712<ul class="simple">
713<li>Effects: Returns a mutable/non-mutable reverse iterator with <tt class="docutils literal">value_type T</tt></li>
714<li>Throws: Nothing</li>
715</ul>
716</blockquote>
717</li>
718</ul>
719</div>
720<div class="section" id="semantics-capacity">
721<span id="capacity"></span><h2>Semantics: capacity</h2>
722<ul>
723<li><p class="first"><tt class="docutils literal">size_type size() const;</tt></p>
724<blockquote>
725<ul class="simple">
726<li>Effects: Returns the number of stored elements</li>
727<li>Throws: Nothing</li>
728</ul>
729</blockquote>
730</li>
731<li><p class="first"><tt class="docutils literal">size_type max_size() const;</tt></p>
732<blockquote>
733<ul class="simple">
734<li>Effects: Returns the maximum number of stored elements</li>
735<li>Throws: Nothing</li>
736</ul>
737</blockquote>
738</li>
739<li><p class="first"><tt class="docutils literal">bool empty() const;</tt></p>
740<blockquote>
741<ul class="simple">
742<li>Effects: Returns whether the container is empty or not</li>
743<li>Throws: Nothing</li>
744</ul>
745</blockquote>
746</li>
747</ul>
748</div>
749<div class="section" id="semantics-modifiers">
750<span id="modifiers"></span><h2>Semantics: modifiers</h2>
751<ul>
752<li><p class="first"><tt class="docutils literal">void swap( reversible_ptr_container&amp; r );</tt></p>
753<blockquote>
754<ul class="simple">
755<li>Effects: Swaps the content of the two containers</li>
756<li>Throws: Nothing</li>
757</ul>
758</blockquote>
759</li>
760<li><p class="first"><tt class="docutils literal">void <span class="pre">clear();</span></tt></p>
761<blockquote>
762<ul class="simple">
763<li>Effects: Destroys all object of the container</li>
764<li>Postconditions: <tt class="docutils literal">empty() == true</tt></li>
765<li>Throws: Nothing</li>
766</ul>
767</blockquote>
768</li>
769<li><p class="first"><tt class="docutils literal">VoidPtrContainer&amp; <span class="pre">base();</span></tt></p>
770</li>
771<li><p class="first"><tt class="docutils literal">const VoidPtrContainer&amp; base() const;</tt></p>
772<blockquote>
773<ul class="simple">
774<li>Returns: a reference to the wrapped container</li>
775</ul>
776</blockquote>
777</li>
778</ul>
779</div>
780<div class="section" id="semantics-pointer-container-requirements">
781<span id="pointer-container-requirements"></span><h2>Semantics: pointer container requirements</h2>
782<ul>
783<li><p class="first"><tt class="docutils literal">auto_type replace( iterator position, T* x );</tt></p>
784<blockquote>
785<ul class="simple">
786<li>Requirements: <tt class="docutils literal">not empty() and x != 0</tt></li>
787<li>Effects: returns the object pointed to by <tt class="docutils literal">position</tt> and replaces it with <tt class="docutils literal">x</tt>.</li>
788<li>Throws: <tt class="docutils literal">bad_ptr_container_operation</tt> if the container is empty and <tt class="docutils literal">bad_pointer</tt> if <tt class="docutils literal">x == 0</tt>.</li>
789<li>Exception safety: Strong guarantee</li>
790</ul>
791</blockquote>
792</li>
793<li><p class="first"><tt class="docutils literal">template&lt; class U &gt; auto_type replace( iterator position, <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>
794<blockquote>
795<ul class="simple">
796<li>Effects: <tt class="docutils literal">return replace( position, x.release() );</tt></li>
797</ul>
798</blockquote>
799</li>
800<li><p class="first"><tt class="docutils literal"><span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;</span> reversible_ptr_container &gt; clone() const;</tt></p>
801<blockquote>
802<ul class="simple">
803<li>Effects: Returns a deep copy of the container</li>
804<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>
805<li>Complexity: Linear</li>
806</ul>
807</blockquote>
808</li>
809<li><p class="first"><tt class="docutils literal"><span class="pre"><a class="reference external" href="compatible_smart_ptr.html"><em>compatible-smart-ptr</em></a>&lt;</span> reversible_ptr_container &gt; <span class="pre">release();</span></tt></p>
810<blockquote>
811<ul class="simple">
812<li>Effects: Releases ownership of the container. This is a useful way of returning a container from a function.</li>
813<li>Postconditions: <tt class="docutils literal">empty() == true</tt></li>
814<li>Throws: <tt class="docutils literal"><span class="pre">std::bad_alloc</span></tt> if the return value cannot be allocated</li>
815<li>Exception safety: Strong guarantee</li>
816</ul>
817</blockquote>
818</li>
819<li><p class="first"><tt class="docutils literal">auto_type release( iterator position );</tt></p>
820<blockquote>
821<ul class="simple">
822<li>Requirements: <tt class="docutils literal">not <span class="pre">empty();</span></tt></li>
823<li>Effects: Releases ownership of the pointer referred to by position</li>
824<li>Postconditions: <tt class="docutils literal">size()</tt> is one less</li>
825<li>Throws: <tt class="docutils literal">bad_ptr_container_operation</tt> if the container is empty</li>
826<li>Exception safety: Strong guarantee</li>
827</ul>
828</blockquote>
829</li>
830</ul>
831</div>
832<div class="section" id="semantics-comparison">
833<span id="comparison"></span><h2>Semantics: comparison</h2>
834<p>These functions compare the underlying range of objects.
835So</p>
836<pre class="literal-block">
837operation( const ptr_container&amp; l, const ptr_container&amp; r );
838</pre>
839<p>has the effect one would expect of normal standard containers. Hence
840objects are compared and not the pointers to objects.</p>
841</div>
842<div class="section" id="semantics-cloneability">
843<span id="cloneability"></span><h2>Semantics: cloneability</h2>
844<ul>
845<li><p class="first"><tt class="docutils literal">template&lt; class T, class CloneAllocator &gt;
846reversible_ptr_container&lt;T,CA,VPC&gt;*
847new_clone( const reversible_ptr_container&lt;T,CA,VPC&gt;&amp; r );</tt></p>
848<blockquote>
849<ul class="simple">
850<li>Effects: <tt class="docutils literal">return <span class="pre">r.clone().release();</span></tt></li>
851<li>Remarks: This function is only defined for concrete <a class="reference external" href="ptr_container.html#smart-containers">pointer containers</a>, but not for
852<a class="reference external" href="ptr_container.html#smart-container-adapters">pointer container adapters</a>.</li>
853</ul>
854</blockquote>
855</li>
856</ul>
857</div>
858<div class="section" id="semantics-null-predicate">
859<span id="null-predicate"></span><h2>Semantics: null predicate</h2>
860<ul>
861<li><p class="first"><tt class="docutils literal">template&lt; class Iterator &gt; bool is_null( Iterator i );</tt></p>
862<blockquote>
863<ul class="simple">
864<li>Requirements: <tt class="docutils literal">i</tt> is a valid dereferencable iterator</li>
865<li>Returns: <tt class="docutils literal">*i.base() == 0;</tt></li>
866</ul>
867</blockquote>
868</li>
869</ul>
870</div>
871<div class="section" id="semantics-serialization">
872<span id="serialization"></span><h2>Semantics: serialization</h2>
873<p>All containers can be serialized by means of
874<a class="reference external" href="../../serialization/index.html">Boost.Serialization</a>. For an overview, see
875<a class="reference external" href="reference.html#serialization">Serialization of Pointer Containers</a>.</p>
876<blockquote>
877<pre class="literal-block">
878template&lt;class Archive, class T, class CA, class VPC&gt;
879void serialize( Archive&amp; ar, reversible_ptr_container&lt;T,CA,VPC&gt;&amp; c, const unsigned int version );
880</pre>
881</blockquote>
882<ul class="simple">
883<li>Effects: Saves or loads the container to/from the archive.</li>
884<li>Remarks: This function is called automatically be stream operators in
885Boost.Serialization</li>
886<li>Exception safety: Loading gives the basic guarantee</li>
887</ul>
888<hr><table class="docutils field-list" frame="void" rules="none">
889<col class="field-name" />
890<col class="field-body" />
891<tbody valign="top">
892<tr class="field"><th class="field-name">Copyright:</th><td class="field-body">Thorsten Ottosen 2004-2007. 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>
893</tr>
894</tbody>
895</table>
896</div>
897</div>
898</div>
899</body>
900</html>
901