alloc_traits.h (__allocator_always_compares_equal): New trait, provide partial specializations for known allocators.
2011-07-09 Jonathan Wakely <jwakely.gcc@gmail.com> * include/ext/alloc_traits.h (__allocator_always_compares_equal): New trait, provide partial specializations for known allocators. (__alloc_traits::construct, __alloc_traits::destroy): Overload for non-standard pointer types. (__alloc_traits::_S_always_equal): New trait for use with noexcept. (__alloc_traits::_S_nothrow_move): Likewise. (__alloc_traits::_S_nothrow_swap): Likewise. From-SVN: r176077
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@ -1,3 +1,13 @@
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2011-07-09 Jonathan Wakely <jwakely.gcc@gmail.com>
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* include/ext/alloc_traits.h (__allocator_always_compares_equal): New
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trait, provide partial specializations for known allocators.
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(__alloc_traits::construct, __alloc_traits::destroy): Overload for
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non-standard pointer types.
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(__alloc_traits::_S_always_equal): New trait for use with noexcept.
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(__alloc_traits::_S_nothrow_move): Likewise.
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(__alloc_traits::_S_nothrow_swap): Likewise.
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2011-07-09 Jonathan Wakely <jwakely.gcc@gmail.com>
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* include/ext/cast.h: Fix typo in include guard.
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@ -37,14 +37,55 @@
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# include <bits/allocator.h> // for __alloc_swap
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#endif
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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template<typename> struct allocator;
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @brief Uniform interface to C++98 and C++0x allocators.
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* @ingroup allocators
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*/
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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template<typename _Alloc>
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struct __allocator_always_compares_equal
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{ static const bool value = false; };
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template<typename _Tp>
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struct __allocator_always_compares_equal<std::allocator<_Tp>>
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{ static const bool value = true; };
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template<typename, typename> struct array_allocator;
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template<typename _Tp, typename _Array>
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struct __allocator_always_compares_equal<array_allocator<_Tp, _Array>>
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{ static const bool value = true; };
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template<typename> struct mt_allocator;
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template<typename _Tp>
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struct __allocator_always_compares_equal<mt_allocator<_Tp>>
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{ static const bool value = true; };
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template<typename> struct new_allocator;
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template<typename _Tp>
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struct __allocator_always_compares_equal<new_allocator<_Tp>>
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{ static const bool value = true; };
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template<typename> struct pool_allocator;
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template<typename _Tp>
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struct __allocator_always_compares_equal<pool_allocator<_Tp>>
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{ static const bool value = true; };
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#endif
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/**
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* @brief Uniform interface to C++98 and C++0x allocators.
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* @ingroup allocators
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*/
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template<typename _Alloc>
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struct __alloc_traits
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#ifdef __GXX_EXPERIMENTAL_CXX0X__
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using _Base_type::construct;
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using _Base_type::destroy;
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private:
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template<typename _Ptr>
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struct __is_custom_pointer
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: std::integral_constant<bool, std::is_same<pointer, _Ptr>::value
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&& !std::is_pointer<_Ptr>::value>
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{ };
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public:
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template<typename _Ptr, typename... _Args>
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static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
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construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
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{
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_Base_type::construct(__a, std::addressof(*__p),
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std::forward<_Args>(__args)...);
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}
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template<typename _Ptr>
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static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
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destroy(_Alloc& __a, _Ptr __p)
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{ _Base_type::destroy(__a, std::addressof(*__p)); }
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static _Alloc _S_select_on_copy(const _Alloc& __a)
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{ return _Base_type::select_on_container_copy_construction(__a); }
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static constexpr bool _S_propagate_on_swap()
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{ return _Base_type::propagate_on_container_swap::value; }
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static constexpr bool _S_always_equal()
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{ return __allocator_always_compares_equal<_Alloc>::value; }
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static constexpr bool _S_nothrow_move()
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{ return _S_propagate_on_move_assign() || _S_always_equal(); }
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static constexpr bool _S_nothrow_swap()
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{
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using std::swap;
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return !_S_propagate_on_swap()
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|| noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>()));
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}
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#else
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typedef typename _Alloc::pointer pointer;
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