[ceph.git] / ceph / src / boost / libs / ptr_container / doc / indirect_fun.html

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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>
<h2 class="subtitle" id="indirected-functions">Indirected functions</h2>
<p>It is quite common that we have two pointers and what to compare the
pointed to objects. Also, we have usually already defined how
to compare the objects. So to avoid some tedious boiler-plate code
this library defines predicates that apply an indirection before comparing.</p>
<p>When the container uses <tt class="docutils literal"><span class="pre">void*</span></tt> internally, we can use the
class <tt class="docutils literal"><span class="pre">void_ptr_indirect_fun</span></tt>; otherwise we use the class
<tt class="docutils literal"><span class="pre">indirect_fun</span></tt>.</p>
<p><strong>Example:</strong></p>
<pre class="literal-block">
std::string* bar = new std::string(&quot;bar&quot;);
std::string* foo = new std::string(&quot;foo&quot;);
BOOST_ASSERT( indirect_fun&lt; std::less&lt;std::string&gt; &gt;()( bar, foo ) == true );
BOOST_ASSERT( make_indirect_fun( std::less&lt;std::string&gt;() )( foo, bar ) == false );   

void*       vptr1  = ptr1;
void*       vptr2  = ptr2;
void_ptr_indirect_fun&lt; std::less&lt;std::string&gt;, std::string&gt; cast_fun;
BOOST_CHECK( cast_fun( vptr1, vptr2 ) == true );
</pre>
<p><strong>See also:</strong></p>
<ul class="simple">
<li><a class="reference" href="http://www.boost.org/libs/utility/utility.htm#result_of">result_of</a></li>
<li><a class="reference" href="http://www.boost.org/libs/iterator/doc/pointee.html">pointee</a></li>
<li><a class="reference" href="ptr_set.html">ptr_set</a></li>
<li><a class="reference" href="ptr_multiset.html">ptr_multiset</a></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>Remarks:</strong></p>
<p>The class <tt class="docutils literal"><span class="pre">indirect_fun</span></tt> will work with smart pointers such as <a class="reference" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm">boost::shared_ptr&lt;T&gt;</a>
because of the type traits <tt class="docutils literal"><span class="pre">pointee&lt;T&gt;::type</span></tt> from the header <tt class="docutils literal"><span class="pre">&lt;boost/pointee.hpp&gt;</span></tt>.</p>
<p><strong>Synopsis:</strong></p>
<p>Since the definition of the predicates is somewhat trivial, only the
first operation is expanded inline.</p>
<pre class="literal-block">
namespace boost
{      

    template&lt; class Fun &gt;
    struct indirect_fun
    {
        indirect_fun() : fun(Fun())
        { }
        
        indirect_fun( Fun f ) : fun(f)
        { }
    
        template&lt; class T &gt;
        typename result_of&lt; Fun( typename pointee&lt;T&gt;::type ) &gt;::type 
        operator()( const T&amp; r ) const
        { 
            return fun( *r );
        }
    
        template&lt; class T, class U &gt;
        typename result_of&lt; Fun( typename pointee&lt;T&gt;::type, 
                                 typename pointee&lt;U&gt;::type ) &gt;::type 
        operator()( const T&amp; r, const U&amp; r2 ) const
        { 
            return fun( *r, *r2 );
        }
    
    private:
        Fun fun;
    };

    template&lt; class Fun &gt;
    inline indirect_fun&lt;Fun&gt; make_indirect_fun( Fun f )
    {
        return indirect_fun&lt;Fun&gt;( f );
    }        


    template&lt; class Fun, class Arg1, class Arg2 = Arg1 &gt;
    struct void_ptr_indirect_fun
    {
        void_ptr_indirect_fun() : fun(Fun())
        { }

        void_ptr_indirect_fun( Fun f ) : fun(f)
        { }

        typename result_of&lt; Fun( Arg1 ) &gt;::type 
        operator()( const void* r ) const
        { 
            return fun( * static_cast&lt;const Arg1*&gt;( r ) );
        }

        typename result_of&lt; Fun( Arg1, Arg2 ) &gt;::type 
        operator()( const void* l, const void* r ) const
        { 
            return fun( * static_cast&lt;const Arg1*&gt;( l ), * static_cast&lt;const Arg2*&gt;( r ) );
        }
        
    private:
        Fun fun;   
    };

    template&lt; class Fun, class Arg &gt;
    inline void_ptr_indirect_fun&lt;Fun,Arg&gt; 
    make_void_ptr_indirect_fun( Fun f )
    {
        return void_ptr_indirect_fun&lt;Fun,Arg&gt;( f );
    }
         
} // namespace 'boost'  
</pre>
<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>
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</div>
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288	</head>
289	<body>
290	<div class="document" id="boost-pointer-container-library">
291	<h1 class="title"><img alt="Boost" src="boost.png" /> Pointer Container Library</h1>
292	<h2 class="subtitle" id="indirected-functions">Indirected functions</h2>
293	<p>It is quite common that we have two pointers and what to compare the
294	pointed to objects. Also, we have usually already defined how
295	to compare the objects. So to avoid some tedious boiler-plate code
296	this library defines predicates that apply an indirection before comparing.</p>
297	<p>When the container uses <tt class="docutils literal"><span class="pre">void*</span></tt> internally, we can use the
298	class <tt class="docutils literal"><span class="pre">void_ptr_indirect_fun</span></tt>; otherwise we use the class
299	<tt class="docutils literal"><span class="pre">indirect_fun</span></tt>.</p>
300	<p><strong>Example:</strong></p>
301	<pre class="literal-block">
302	std::string* bar = new std::string("bar");
303	std::string* foo = new std::string("foo");
304	BOOST_ASSERT( indirect_fun< std::less<std::string> >()( bar, foo ) == true );
305	BOOST_ASSERT( make_indirect_fun( std::less<std::string>() )( foo, bar ) == false );
306
307	void* vptr1 = ptr1;
308	void* vptr2 = ptr2;
309	void_ptr_indirect_fun< std::less<std::string>, std::string> cast_fun;
310	BOOST_CHECK( cast_fun( vptr1, vptr2 ) == true );
311	</pre>
312	<p><strong>See also:</strong></p>
313	<ul class="simple">
314	<li><a class="reference" href="http://www.boost.org/libs/utility/utility.htm#result_of">result_of</a></li>
315	<li><a class="reference" href="http://www.boost.org/libs/iterator/doc/pointee.html">pointee</a></li>
316	<li><a class="reference" href="ptr_set.html">ptr_set</a></li>
317	<li><a class="reference" href="ptr_multiset.html">ptr_multiset</a></li>
318	</ul>
319	<p><strong>Navigate</strong></p>
320	<ul class="simple">
321	<li><a class="reference" href="ptr_container.html">home</a></li>
322	<li><a class="reference" href="reference.html">reference</a></li>
323	</ul>
324	<p><strong>Remarks:</strong></p>
325	<p>The class <tt class="docutils literal"><span class="pre">indirect_fun</span></tt> will work with smart pointers such as <a class="reference" href="http://www.boost.org/libs/smart_ptr/shared_ptr.htm">boost::shared_ptr<T></a>
326	because of the type traits <tt class="docutils literal"><span class="pre">pointee<T>::type</span></tt> from the header <tt class="docutils literal"><span class="pre"><boost/pointee.hpp></span></tt>.</p>
327	<p><strong>Synopsis:</strong></p>
328	<p>Since the definition of the predicates is somewhat trivial, only the
329	first operation is expanded inline.</p>
330	<pre class="literal-block">
331	namespace boost
332	{
333
334	template< class Fun >
335	struct indirect_fun
336	{
337	indirect_fun() : fun(Fun())
338	{ }
339
340	indirect_fun( Fun f ) : fun(f)
341	{ }
342
343	template< class T >
344	typename result_of< Fun( typename pointee<T>::type ) >::type
345	operator()( const T& r ) const
346	{
347	return fun( *r );
348	}
349
350	template< class T, class U >
351	typename result_of< Fun( typename pointee<T>::type,
352	typename pointee<U>::type ) >::type
353	operator()( const T& r, const U& r2 ) const
354	{
355	return fun( r, r2 );
356	}
357
358	private:
359	Fun fun;
360	};
361
362	template< class Fun >
363	inline indirect_fun<Fun> make_indirect_fun( Fun f )
364	{
365	return indirect_fun<Fun>( f );
366	}
367
368
369
370	template< class Fun, class Arg1, class Arg2 = Arg1 >
371	struct void_ptr_indirect_fun
372	{
373	void_ptr_indirect_fun() : fun(Fun())
374	{ }
375
376	void_ptr_indirect_fun( Fun f ) : fun(f)
377	{ }
378
379	typename result_of< Fun( Arg1 ) >::type
380	operator()( const void* r ) const
381	{
382	return fun( * static_cast<const Arg1*>( r ) );
383	}
384
385	typename result_of< Fun( Arg1, Arg2 ) >::type
386	operator()( const void* l, const void* r ) const
387	{
388	return fun( * static_cast<const Arg1>( l ), static_cast<const Arg2*>( r ) );
389	}
390
391	private:
392	Fun fun;
393	};
394
395	template< class Fun, class Arg >
396	inline void_ptr_indirect_fun<Fun,Arg>
397	make_void_ptr_indirect_fun( Fun f )
398	{
399	return void_ptr_indirect_fun<Fun,Arg>( f );
400	}
401
402	} // namespace 'boost'
403	</pre>
404	<hr><table class="docutils field-list" frame="void" rules="none">
405	<col class="field-name" />
406	<col class="field-body" />
407	<tbody valign="top">
408	<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>
409	</tr>
410	</tbody>
411	</table>
412	</div>
413	</body>
414	</html>