Provided by: libstdc++-9-doc_9.5.0-3ubuntu1_all 
NAME
std::allocator_traits< _Alloc > - Uniform interface to all allocator types.
SYNOPSIS
#include <alloc_traits.h>
Inherits std::__allocator_traits_base.
Inherited by __gnu_cxx::__alloc_traits< _Alloc, typename >.
Public Types
typedef _Alloc allocator_type
The allocator type.
using const_pointer = typename _Ptr< __c_pointer, const value_type >::type
The allocator's const pointer type.
using const_void_pointer = typename _Ptr< __cv_pointer, const void >::type
The allocator's const void pointer type.
using difference_type = typename _Diff< _Alloc, pointer >::type
The allocator's 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.
using pointer = __detected_or_t< value_type *, __pointer, _Alloc >
The allocator's pointer type.
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 > >
using size_type = typename _Size< _Alloc, difference_type >::type
The allocator's size type.
typedef _Alloc::value_type value_type
The allocated type.
using void_pointer = typename _Ptr< __v_pointer, void >::type
The allocator's void pointer type.
Static Public Member Functions
static _GLIBCXX_NODISCARD pointer allocate (_Alloc &__a, size_type __n)
Allocate memory.
static _GLIBCXX_NODISCARD pointer allocate (_Alloc &__a, size_type __n, const_void_pointer
__hint)
Allocate memory.
template<typename _Tp , typename... _Args> static 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 void deallocate (_Alloc &__a, pointer __p, size_type __n)
Deallocate memory.
template<typename _Tp > static void destroy (_Alloc &__a, _Tp *__p)
noexcept(noexcept(_S_destroy(__a, __p, 0)))
Destroy an object of type _Tp.
static size_type max_size (const _Alloc &__a) noexcept
The maximum supported allocation size.
static _Alloc select_on_container_copy_construction (const _Alloc &__rhs)
Obtain an allocator to use when copying a container.
Protected Types
template<typename _Tp > using __c_pointer = typename _Tp::const_pointer
template<typename _Tp > using __cv_pointer = typename _Tp::const_void_pointer
template<typename _Tp > using __equal = typename _Tp::is_always_equal
template<typename _Tp > using __pocca = typename
_Tp::propagate_on_container_copy_assignment
template<typename _Tp > using __pocma = typename
_Tp::propagate_on_container_move_assignment
template<typename _Tp > using __pocs = typename _Tp::propagate_on_container_swap
template<typename _Tp > using __pointer = typename _Tp::pointer
template<typename _Tp > using __v_pointer = typename _Tp::void_pointer
Detailed Description
template<typename _Alloc>
struct std::allocator_traits< _Alloc >"Uniform interface to all allocator types.
Definition at line 83 of file bits/alloc_traits.h.
Member Typedef Documentation
template<typename _Tp > using std::__allocator_traits_base::__c_pointer = typename
_Tp::const_pointer [protected], [inherited]
Definition at line 59 of file bits/alloc_traits.h.
template<typename _Tp > using std::__allocator_traits_base::__cv_pointer = typename
_Tp::const_void_pointer [protected], [inherited]
Definition at line 63 of file bits/alloc_traits.h.
template<typename _Tp > using std::__allocator_traits_base::__equal = typename
_Tp::is_always_equal [protected], [inherited]
Definition at line 71 of file bits/alloc_traits.h.
template<typename _Tp > using std::__allocator_traits_base::__pocca = typename
_Tp::propagate_on_container_copy_assignment [protected], [inherited]
Definition at line 65 of file bits/alloc_traits.h.
template<typename _Tp > using std::__allocator_traits_base::__pocma = typename
_Tp::propagate_on_container_move_assignment [protected], [inherited]
Definition at line 67 of file bits/alloc_traits.h.
template<typename _Tp > using std::__allocator_traits_base::__pocs = typename
_Tp::propagate_on_container_swap [protected], [inherited]
Definition at line 69 of file bits/alloc_traits.h.
template<typename _Tp > using std::__allocator_traits_base::__pointer = typename _Tp::pointer
[protected], [inherited]
Definition at line 57 of file bits/alloc_traits.h.
template<typename _Tp > using std::__allocator_traits_base::__v_pointer = typename
_Tp::void_pointer [protected], [inherited]
Definition at line 61 of file bits/alloc_traits.h.
template<typename _Alloc > typedef _Alloc std::allocator_traits< _Alloc >::allocator_type
The allocator type.
Definition at line 86 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc >::const_pointer = typename
_Ptr<__c_pointer, const value_type>::type
The allocator's const pointer type. Alloc::const_pointer if that type exists, otherwise
pointer_traits<pointer>::rebind<const value_type>
Definition at line 135 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc >::const_void_pointer =
typename _Ptr<__cv_pointer, const void>::type
The allocator's const void pointer type. Alloc::const_void_pointer if that type exists,
otherwise pointer_traits<pointer>::rebind<const void>
Definition at line 151 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc >::difference_type = typename
_Diff<_Alloc, pointer>::type
The allocator's difference type. Alloc::difference_type if that type exists, otherwise
pointer_traits<pointer>::difference_type
Definition at line 159 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc >::is_always_equal =
__detected_or_t<typename is_empty<_Alloc>::type, __equal, _Alloc>
Whether all instances of the allocator type compare equal. Alloc::is_always_equal if that
type exists, otherwise is_empty<Alloc>::type
Definition at line 202 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc >::pointer =
__detected_or_t<value_type*, __pointer, _Alloc>
The allocator's pointer type. Alloc::pointer if that type exists, otherwise value_type*
Definition at line 95 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc
>::propagate_on_container_copy_assignment = __detected_or_t<false_type, __pocca, _Alloc>
How the allocator is propagated on copy assignment.
Alloc::propagate_on_container_copy_assignment if that type exists, otherwise false_type
Definition at line 175 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc
>::propagate_on_container_move_assignment = __detected_or_t<false_type, __pocma, _Alloc>
How the allocator is propagated on move assignment.
Alloc::propagate_on_container_move_assignment if that type exists, otherwise false_type
Definition at line 184 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc >::propagate_on_container_swap
= __detected_or_t<false_type, __pocs, _Alloc>
How the allocator is propagated on swap. Alloc::propagate_on_container_swap if that type
exists, otherwise false_type
Definition at line 193 of file bits/alloc_traits.h.
template<typename _Alloc > template<typename _Tp > using std::allocator_traits< _Alloc
>::rebind_alloc = __alloc_rebind<_Alloc, _Tp>
Definition at line 206 of file bits/alloc_traits.h.
template<typename _Alloc > template<typename _Tp > using std::allocator_traits< _Alloc
>::rebind_traits = allocator_traits<rebind_alloc<_Tp> >
Definition at line 208 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc >::size_type = typename
_Size<_Alloc, difference_type>::type
The allocator's size type. Alloc::size_type if that type exists, otherwise
make_unsigned<difference_type>::type
Definition at line 167 of file bits/alloc_traits.h.
template<typename _Alloc > typedef _Alloc::value_type std::allocator_traits< _Alloc
>::value_type
The allocated type.
Definition at line 88 of file bits/alloc_traits.h.
template<typename _Alloc > using std::allocator_traits< _Alloc >::void_pointer = typename
_Ptr<__v_pointer, void>::type
The allocator's void pointer type. Alloc::void_pointer if that type exists, otherwise
pointer_traits<pointer>::rebind<void>
Definition at line 143 of file bits/alloc_traits.h.
Member Function Documentation
template<typename _Alloc > static _GLIBCXX_NODISCARD pointer std::allocator_traits< _Alloc
>::allocate (_Alloc & __a, size_type __n) [inline], [static]
Allocate memory.
Parameters
__a An allocator.
__n The number of objects to allocate space for.
Calls a.allocate(n)
Definition at line 304 of file bits/alloc_traits.h.
Referenced by std::__allocate_guarded().
template<typename _Alloc > static _GLIBCXX_NODISCARD pointer std::allocator_traits< _Alloc
>::allocate (_Alloc & __a, size_type __n, const_void_pointer __hint) [inline], [static]
Allocate memory.
Parameters
__a An allocator.
__n The number of objects to allocate space for.
__hint Aid to locality.
Returns
Memory of suitable size and alignment for n objects of type value_type
Returns a.allocate(n, hint) if that expression is well-formed, otherwise returns
a.allocate(n)
Definition at line 319 of file bits/alloc_traits.h.
template<typename _Alloc > template<typename _Tp , typename... _Args> static auto
std::allocator_traits< _Alloc >::construct (_Alloc & __a, _Tp * __p, _Args &&... __args)
-> decltype(_S_construct(__a, __p, std::forward<_Args>(__args)...))
[inline], [static], [noexcept]"
Construct an object of type `_Tp`.
Parameters
__a An allocator.
__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...
Definition at line 346 of file bits/alloc_traits.h.
template<typename _Alloc > static void std::allocator_traits< _Alloc >::deallocate (_Alloc &
__a, pointer __p, size_type __n) [inline], [static]
Deallocate memory.
Parameters
__a An allocator.
__p Pointer to the memory to deallocate.
__n The number of objects space was allocated for.
Calls a.deallocate(p, n)
Definition at line 331 of file bits/alloc_traits.h.
Referenced by std::__allocated_ptr< _Alloc >::~__allocated_ptr().
template<typename _Alloc > template<typename _Tp > static void std::allocator_traits< _Alloc
>::destroy (_Alloc & __a, _Tp * __p) [inline], [static], [noexcept]
Destroy an object of type _Tp.
Parameters
__a An allocator.
__p Pointer to the object to destroy
Calls __a.destroy(__p) if that expression is well-formed, otherwise calls __p->~_Tp()
Definition at line 361 of file bits/alloc_traits.h.
template<typename _Alloc > static size_type std::allocator_traits< _Alloc >::max_size (const
_Alloc & __a) [inline], [static], [noexcept]
The maximum supported allocation size.
Parameters
__a An allocator.
Returns
__a.max_size() or numeric_limits<size_type>::max()
Returns __a.max_size() if that expression is well-formed, otherwise returns
numeric_limits<size_type>::max()
Definition at line 373 of file bits/alloc_traits.h.
template<typename _Alloc > static _Alloc std::allocator_traits< _Alloc
>::select_on_container_copy_construction (const _Alloc & __rhs) [inline], [static]
Obtain an allocator to use when copying a container.
Parameters
__rhs An allocator.
Returns
__rhs.select_on_container_copy_construction() or __rhs
Returns __rhs.select_on_container_copy_construction() if that expression is well-formed,
otherwise returns __rhs
Definition at line 385 of file bits/alloc_traits.h.
Author
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