Provided by: libstdc++-10-doc_10.4.0-5ubuntu2_all 
NAME
__gnu_cxx::__alloc_traits< _Alloc, typename > - Uniform interface to C++98 and C++11
allocators.
SYNOPSIS
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
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.
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 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.
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, typename = typename _Alloc::value_type>
struct __gnu_cxx::__alloc_traits< _Alloc, typename >" Uniform interface to C++98 and C++11
allocators.
Definition at line 48 of file ext/alloc_traits.h.
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>
Definition at line 154 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> [inherited]
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 205 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>
[inherited]
How the allocator is propagated on copy assignment.
Alloc::propagate_on_container_copy_assignment if that type exists, otherwise false_type
Definition at line 178 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>
[inherited]
How the allocator is propagated on move assignment.
Alloc::propagate_on_container_move_assignment if that type exists, otherwise false_type
Definition at line 187 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> [inherited]
How the allocator is propagated on swap. Alloc::propagate_on_container_swap if that type
exists, otherwise false_type
Definition at line 196 of file bits/alloc_traits.h.
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>
Definition at line 146 of file bits/alloc_traits.h.
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
__a An allocator.
__n The number of objects to allocate space for.
Calls a.allocate(n)
Definition at line 313 of file bits/alloc_traits.h.
Referenced by std::__allocate_guarded().
template<typename _Alloc , typename = typename _Alloc::value_type> static constexpr pointer
std::allocator_traits< _Alloc >::allocate [inline], [static], [constexpr]
Allocate memory.
Parameters
__a An allocator.
__n The number of objects to allocate space for.
Calls a.allocate(n)
Definition at line 313 of file bits/alloc_traits.h.
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
__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 328 of file bits/alloc_traits.h.
template<typename _Alloc , typename = typename _Alloc::value_type> static constexpr pointer
std::allocator_traits< _Alloc >::allocate [inline], [static], [constexpr]
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 328 of file bits/alloc_traits.h.
template<typename _Alloc > 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], [inherited]"
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 356 of file bits/alloc_traits.h.
template<typename _Alloc , typename = typename _Alloc::value_type> template<typename _Tp ,
typename... _Args> static constexpr auto std::allocator_traits< _Alloc >::construct
(typename _Tp, typename... _Args) [inline], [static], [constexpr], [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 356 of file bits/alloc_traits.h.
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
__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 340 of file bits/alloc_traits.h.
Referenced by std::__allocated_ptr< _Alloc >::~__allocated_ptr().
template<typename _Alloc , typename = typename _Alloc::value_type> static constexpr void
std::allocator_traits< _Alloc >::deallocate [inline], [static], [constexpr]
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 340 of file bits/alloc_traits.h.
template<typename _Alloc > template<typename _Tp > static constexpr void
std::allocator_traits< _Alloc >::destroy (_Alloc & __a, _Tp * __p) [inline], [static],
[constexpr], [noexcept], [inherited]
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 372 of file bits/alloc_traits.h.
Referenced by std::_Destroy().
template<typename _Alloc , typename = typename _Alloc::value_type> template<typename _Tp >
static constexpr void std::allocator_traits< _Alloc >::destroy (typename _Tp) [inline],
[static], [constexpr], [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 372 of file bits/alloc_traits.h.
template<typename _Alloc > static constexpr size_type std::allocator_traits< _Alloc
>::max_size (const _Alloc & __a) [inline], [static], [constexpr], [noexcept],
[inherited]
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 385 of file bits/alloc_traits.h.
template<typename _Alloc , typename = typename _Alloc::value_type> static constexpr size_type
std::allocator_traits< _Alloc >::max_size [inline], [static], [constexpr], [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 385 of file bits/alloc_traits.h.
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
__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 397 of file bits/alloc_traits.h.
Author
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