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Add overloads for std::shared_ptr to pointer casts

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This commit is contained in:
Karolin Varner
2016-06-06 14:51:44 +02:00
parent 2185c4f005
commit 6b787f1cec
4 changed files with 169 additions and 2 deletions
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pointer_cast.html
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@@ -9,7 +9,7 @@
width="277" align="middle" border="0">pointer_cast</h1>
<p>The pointer cast functions (<code>boost::static_pointer_cast</code> <code>boost::dynamic_pointer_cast</code>
<code>boost::reinterpret_pointer_cast</code> <code>boost::const_pointer_cast</code>)
provide a way to write generic pointer castings for raw pointers. The functions
provide a way to write generic pointer castings for raw pointers and std::shared_ptr. The functions
are defined in <CITE><A href="../../boost/pointer_cast.hpp">boost/pointer_cast.hpp</A>.</CITE></p>
<P>There is test/example code in <CITE><A href="test/pointer_cast_test.cpp">pointer_cast_test.cpp</A></CITE>.</p>
<h2><a name="rationale">Rationale</a></h2>
@@ -23,7 +23,7 @@ template&lt;class T, class U&gt;
<P>Pointer cast functions from <CITE><A href="../../boost/pointer_cast.hpp">boost/pointer_cast.hpp</A></CITE>
are overloads of <code>boost::static_pointer_cast</code>, <code>boost::dynamic_pointer_cast</code>,
<code>boost::reinterpret_pointer_cast</code> and <code>boost::const_pointer_cast</code>
for raw pointers. This way when developing pointer type independent classes,
for raw pointers and std::shared_ptr. This way when developing pointer type independent classes,
for example, memory managers or shared memory compatible classes, the same code
can be used for raw and smart pointers.</p>
<H2><A name="synopsis">Synopsis</A></H2>
@@ -46,6 +46,18 @@ inline T* const_pointer_cast(U *ptr)
template&lt;class T, class U&gt;
inline T* reinterpret_pointer_cast(U *ptr)
{ return reinterpret_cast&lt;T*&gt;(ptr); }
template&lt;class T, class U&gt;
inline std::shared_ptr&lt;U&gt; static_pointer_cast(std::shared_ptr&lt;T&gt; ptr);
template&lt;class T, class U&gt;
inline std::shared_ptr&lt;U&gt; dynamic_pointer_cast(std::shared_ptr&lt;T&gt; ptr);
template&lt;class T, class U&gt;
inline std::shared_ptr&lt;U&gt; const_pointer_cast(std::shared_ptr&lt;T&gt; ptr);
template&lt;class T, class U&gt;
inline std::shared_ptr&lt;U&gt; reinterpret_pointer_cast(std::shared_ptr&lt;T&gt; ptr);
} // namespace boost
</PRE>