deps/boost_1_63_0/boost/pointer_cast.hpp

   1 //////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga 2005.
   4 // Distributed under the Boost Software License, Version 1.0.
   5 // (See accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 //////////////////////////////////////////////////////////////////////////////
   9
  10 #ifndef BOOST_POINTER_CAST_HPP
  11 #define BOOST_POINTER_CAST_HPP
  12
  13 #include <boost/config.hpp>
  14
  15 namespace boost {
  16
  17 //static_pointer_cast overload for raw pointers
  18 template<class T, class U>
  19 inline T* static_pointer_cast(U *ptr)
  20 {
  21    return static_cast<T*>(ptr);
  22 }
  23
  24 //dynamic_pointer_cast overload for raw pointers
  25 template<class T, class U>
  26 inline T* dynamic_pointer_cast(U *ptr)
  27 {
  28    return dynamic_cast<T*>(ptr);
  29 }
  30
  31 //const_pointer_cast overload for raw pointers
  32 template<class T, class U>
  33 inline T* const_pointer_cast(U *ptr)
  34 {
  35    return const_cast<T*>(ptr);
  36 }
  37
  38 //reinterpret_pointer_cast overload for raw pointers
  39 template<class T, class U>
  40 inline T* reinterpret_pointer_cast(U *ptr)
  41 {
  42    return reinterpret_cast<T*>(ptr);
  43 }
  44
  45 } // namespace boost
  46
  47 #if !defined( BOOST_NO_CXX11_SMART_PTR )
  48
  49 #include <boost/type_traits/has_virtual_destructor.hpp>
  50 #include <boost/static_assert.hpp>
  51 #include <memory>
  52
  53 namespace boost {
  54
  55 //static_pointer_cast overload for std::shared_ptr
  56 using std::static_pointer_cast;
  57
  58 //dynamic_pointer_cast overload for std::shared_ptr
  59 using std::dynamic_pointer_cast;
  60
  61 //const_pointer_cast overload for std::shared_ptr
  62 using std::const_pointer_cast;
  63
  64 //reinterpret_pointer_cast overload for std::shared_ptr
  65 template<class T, class U> std::shared_ptr<T> reinterpret_pointer_cast(const std::shared_ptr<U> & r ) BOOST_NOEXCEPT
  66 {
  67     (void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
  68
  69     typedef typename std::shared_ptr<T>::element_type E;
  70
  71     E * p = reinterpret_cast< E* >( r.get() );
  72     return std::shared_ptr<T>( r, p );
  73 }
  74
  75 //static_pointer_cast overload for std::unique_ptr
  76 template<class T, class U> std::unique_ptr<T> static_pointer_cast( std::unique_ptr<U> && r ) BOOST_NOEXCEPT
  77 {
  78     (void) static_cast< T* >( static_cast< U* >( 0 ) );
  79
  80     typedef typename std::unique_ptr<T>::element_type E;
  81
  82     return std::unique_ptr<T>( static_cast<E*>( r.release() ) );
  83 }
  84
  85 //dynamic_pointer_cast overload for std::unique_ptr
  86 template<class T, class U> std::unique_ptr<T> dynamic_pointer_cast( std::unique_ptr<U> && r ) BOOST_NOEXCEPT
  87 {
  88     (void) dynamic_cast< T* >( static_cast< U* >( 0 ) );
  89
  90     BOOST_STATIC_ASSERT_MSG( boost::has_virtual_destructor<T>::value, "The target of dynamic_pointer_cast must have a virtual destructor." );
  91
  92     T * p = dynamic_cast<T*>( r.get() );
  93     if( p ) r.release();
  94     return std::unique_ptr<T>( p );
  95 }
  96
  97 //const_pointer_cast overload for std::unique_ptr
  98 template<class T, class U> std::unique_ptr<T> const_pointer_cast( std::unique_ptr<U> && r ) BOOST_NOEXCEPT
  99 {
 100     (void) const_cast< T* >( static_cast< U* >( 0 ) );
 101
 102     typedef typename std::unique_ptr<T>::element_type E;
 103
 104     return std::unique_ptr<T>( const_cast<E*>( r.release() ) );
 105 }
 106
 107 //reinterpret_pointer_cast overload for std::unique_ptr
 108 template<class T, class U> std::unique_ptr<T> reinterpret_pointer_cast( std::unique_ptr<U> && r ) BOOST_NOEXCEPT
 109 {
 110     (void) reinterpret_cast< T* >( static_cast< U* >( 0 ) );
 111
 112     typedef typename std::unique_ptr<T>::element_type E;
 113
 114     return std::unique_ptr<T>( reinterpret_cast<E*>( r.release() ) );
 115 }
 116
 117 } // namespace boost
 118
 119 #endif // #if !defined( BOOST_NO_CXX11_SMART_PTR )
 120
 121 #endif   //BOOST_POINTER_CAST_HPP