__gnu_cxx::__alloc_traits< _Alloc, typename >(3cxx) | __gnu_cxx::__alloc_traits< _Alloc, typename >(3cxx) |
NAME¶
__gnu_cxx::__alloc_traits< _Alloc, typename > - Uniform interface to C++98 and C++11 allocators.
SYNOPSIS¶
#include <alloc_traits.h>
Inherits std::allocator_traits< _Alloc >.
Public Types¶
typedef std::allocator_traits< _Alloc >
_Base_type
typedef _Alloc allocator_type
typedef _Base_type::const_pointer const_pointer
typedef const value_type & const_reference
using const_void_pointer = typename _Ptr< __cv_pointer, const void
>::type
The allocator's const void pointer type. typedef
_Base_type::difference_type difference_type
using is_always_equal = __detected_or_t< typename is_empty<
_Alloc >::type, __equal, _Alloc >
Whether all instances of the allocator type compare equal. typedef
_Base_type::pointer pointer
using propagate_on_container_copy_assignment = __detected_or_t<
false_type, __pocca, _Alloc >
How the allocator is propagated on copy assignment. using
propagate_on_container_move_assignment = __detected_or_t<
false_type, __pocma, _Alloc >
How the allocator is propagated on move assignment. using
propagate_on_container_swap = __detected_or_t< false_type, __pocs,
_Alloc >
How the allocator is propagated on swap. template<typename _Tp > using
rebind_alloc = __alloc_rebind< _Alloc, _Tp >
template<typename _Tp > using rebind_traits =
allocator_traits< rebind_alloc< _Tp > >
typedef value_type & reference
typedef _Base_type::size_type size_type
typedef _Base_type::value_type value_type
using void_pointer = typename _Ptr< __v_pointer, void >::type
The allocator's void pointer type.
Static Public Member Functions¶
static constexpr bool _S_always_equal ()
static constexpr bool _S_nothrow_move ()
static constexpr void _S_on_swap (_Alloc &__a, _Alloc &__b)
static constexpr bool _S_propagate_on_copy_assign ()
static constexpr bool _S_propagate_on_move_assign ()
static constexpr bool _S_propagate_on_swap ()
static constexpr _Alloc _S_select_on_copy (const _Alloc &__a)
static constexpr pointer allocate (_Alloc &__a, size_type __n)
Allocate memory. static constexpr pointer allocate (_Alloc &__a,
size_type __n)
Allocate memory. static constexpr pointer allocate (_Alloc &__a,
size_type __n, const_void_pointer __hint)
Allocate memory. static constexpr pointer allocate (_Alloc &__a,
size_type __n, const_void_pointer __hint)
Allocate memory. template<typename _Ptr , typename... _Args> static
constexpr std::__enable_if_t< __is_custom_pointer< _Ptr
>::value > construct (_Alloc &__a, _Ptr __p, _Args
&&... __args) noexcept(noexcept(_Base_type::construct(__a,
std::__to_address(__p), std::forward< _Args >(__args)...)))
template<typename _Tp , typename... _Args> static constexpr auto
construct (_Alloc &__a, _Tp *__p, _Args &&... __args)
noexcept(noexcept(_S_construct(__a, __p, std::forward< _Args
>(__args)...))) -> decltype(_S_construct(__a, __p,
std::forward< _Args >(__args)...))
Construct an object of type _Tp static constexpr void
deallocate (_Alloc &__a, pointer __p, size_type __n)
Deallocate memory. static constexpr void deallocate (_Alloc &__a,
pointer __p, size_type __n)
Deallocate memory. template<typename _Ptr > static constexpr
std::__enable_if_t< __is_custom_pointer< _Ptr
>::value > destroy (_Alloc &__a, _Ptr __p)
noexcept(noexcept(_Base_type::destroy(__a, std::__to_address(__p))))
template<typename _Tp > static constexpr void destroy (_Alloc
&__a, _Tp *__p) noexcept(noexcept(_S_destroy(__a, __p, 0)))
Destroy an object of type _Tp. static constexpr size_type
max_size (const _Alloc &__a) noexcept
The maximum supported allocation size. static constexpr _Alloc
select_on_container_copy_construction (const _Alloc &__rhs)
Obtain an allocator to use when copying a container.
Detailed Description¶
template<typename _Alloc, typename = typename _Alloc::value_type>¶
struct __gnu_cxx::__alloc_traits< _Alloc, typename >"Uniform interface to C++98 and C++11 allocators.
Member Typedef Documentation¶
template<typename _Alloc > using std::allocator_traits< _Alloc >::const_void_pointer = typename _Ptr<__cv_pointer, const void>::type [inherited]¶
The allocator's const void pointer type. Alloc::const_void_pointer if that type exists, otherwise pointer_traits<pointer>::rebind<const void>
template<typename _Alloc > using std::allocator_traits< _Alloc >::is_always_equal = __detected_or_t<typename is_empty<_Alloc>::type, __equal, _Alloc> [inherited]¶
Whether all instances of the allocator type compare equal. Alloc::is_always_equal if that type exists, otherwise is_empty<Alloc>::type
template<typename _Alloc > using std::allocator_traits< _Alloc >::propagate_on_container_copy_assignment = __detected_or_t<false_type, __pocca, _Alloc> [inherited]¶
How the allocator is propagated on copy assignment. Alloc::propagate_on_container_copy_assignment if that type exists, otherwise false_type
template<typename _Alloc > using std::allocator_traits< _Alloc >::propagate_on_container_move_assignment = __detected_or_t<false_type, __pocma, _Alloc> [inherited]¶
How the allocator is propagated on move assignment. Alloc::propagate_on_container_move_assignment if that type exists, otherwise false_type
template<typename _Alloc > using std::allocator_traits< _Alloc >::propagate_on_container_swap = __detected_or_t<false_type, __pocs, _Alloc> [inherited]¶
How the allocator is propagated on swap. Alloc::propagate_on_container_swap if that type exists, otherwise false_type
template<typename _Alloc > using std::allocator_traits< _Alloc >::void_pointer = typename _Ptr<__v_pointer, void>::type [inherited]¶
The allocator's void pointer type. Alloc::void_pointer if that type exists, otherwise pointer_traits<pointer>::rebind<void>
Member Function Documentation¶
template<typename _Alloc > static constexpr pointer std::allocator_traits< _Alloc >::allocate (_Alloc & __a, size_type __n) [inline], [static], [constexpr], [inherited]¶
Allocate memory.
Parameters
__n The number of objects to allocate space for.
Calls a.allocate(n)
template<typename _Alloc , typename = typename _Alloc::value_type> static constexpr pointer std::allocator_traits< _Alloc >::allocate (_Alloc & __a, size_type __n) [inline], [static], [constexpr]¶
Allocate memory.
Parameters
__n The number of objects to allocate space for.
Calls a.allocate(n)
template<typename _Alloc > static constexpr pointer std::allocator_traits< _Alloc >::allocate (_Alloc & __a, size_type __n, const_void_pointer __hint) [inline], [static], [constexpr], [inherited]¶
Allocate memory.
Parameters
__n The number of objects to allocate space for.
__hint Aid to locality.
Returns
Returns a.allocate(n, hint) if that expression is well-formed, otherwise returns a.allocate(n)
template<typename _Alloc , typename = typename _Alloc::value_type> static constexpr pointer std::allocator_traits< _Alloc >::allocate (_Alloc & __a, size_type __n, const_void_pointer __hint) [inline], [static], [constexpr]¶
Allocate memory.
Parameters
__n The number of objects to allocate space for.
__hint Aid to locality.
Returns
Returns a.allocate(n, hint) if that expression is well-formed, otherwise returns a.allocate(n)
template<typename _Alloc , typename = typename _Alloc::value_type> template<typename _Tp , typename... _Args> static constexpr auto std::allocator_traits< _Alloc >::construct (_Alloc & __a, _Tp * __p, _Args &&... __args) -> decltype(_S_construct(__a, __p, std::forward<_Args>(__args)...))¶
[inline], [static], [constexpr], [noexcept]"
Construct an object of type _Tp
Parameters
__p Pointer to memory of suitable size and alignment for Tp
__args Constructor arguments.
Calls __a.construct(__p, std::forward<Args>(__args)...) if that expression is well-formed, otherwise uses placement-new to construct an object of type _Tp at location __p from the arguments __args...
template<typename _Alloc > static constexpr void std::allocator_traits< _Alloc >::deallocate (_Alloc & __a, pointer __p, size_type __n) [inline], [static], [constexpr], [inherited]¶
Deallocate memory.
Parameters
__p Pointer to the memory to deallocate.
__n The number of objects space was allocated for.
Calls a.deallocate(p, n)
template<typename _Alloc , typename = typename _Alloc::value_type> static constexpr void std::allocator_traits< _Alloc >::deallocate (_Alloc & __a, pointer __p, size_type __n) [inline], [static], [constexpr]¶
Deallocate memory.
Parameters
__p Pointer to the memory to deallocate.
__n The number of objects space was allocated for.
Calls a.deallocate(p, n)
template<typename _Alloc , typename = typename _Alloc::value_type> template<typename _Tp > static constexpr void std::allocator_traits< _Alloc >::destroy (_Alloc & __a, _Tp * __p) [inline], [static], [constexpr], [noexcept]¶
Destroy an object of type _Tp.
Parameters
__p Pointer to the object to destroy
Calls __a.destroy(__p) if that expression is well-formed, otherwise calls __p->~_Tp()
template<typename _Alloc , typename = typename _Alloc::value_type> static constexpr size_type std::allocator_traits< _Alloc >::max_size (const _Alloc & __a) [inline], [static], [constexpr], [noexcept]¶
The maximum supported allocation size.
Parameters
Returns
Returns __a.max_size() if that expression is well-formed, otherwise returns numeric_limits<size_type>::max()
Referenced by std::forward_list< _Tp, _Alloc >::max_size(), and std::list< _Tp, _Alloc >::max_size().
template<typename _Alloc > static constexpr _Alloc std::allocator_traits< _Alloc >::select_on_container_copy_construction (const _Alloc & __rhs) [inline], [static], [constexpr], [inherited]¶
Obtain an allocator to use when copying a container.
Parameters
Returns
Returns __rhs.select_on_container_copy_construction() if that expression is well-formed, otherwise returns __rhs
Author¶
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