std::allocator_traits - Man Page

typedef _Alloc allocator_type
The allocator type.
using const_pointer
The allocator's const pointer type.
using const_void_pointer
The allocator's const void pointer type.
using difference_type
The allocator's difference type.
using is_always_equal
Whether all instances of the allocator type compare equal.
using pointer
The allocator's pointer type.
using propagate_on_container_copy_assignment
How the allocator is propagated on copy assignment.
using propagate_on_container_move_assignment
How the allocator is propagated on move assignment.
using propagate_on_container_swap
How the allocator is propagated on swap.
template<typename _Tp > using rebind_alloc
template<typename _Tp > using rebind_traits
using size_type
The allocator's size type.
typedef _Alloc::value_type value_type
The allocated type.
using void_pointer
The allocator's void pointer type.

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.
template<typename _Tp , typename... _Args> static constexpr __enable_if_t< __can_construct< _Alloc, _Tp, _Args... > > construct (_Alloc &__a, _Tp *__p, _Args &&... __args) noexcept(_S_nothrow_construct< _Tp, _Args... >())
Construct an object of type _Tp
static constexpr void deallocate (_Alloc &__a, pointer __p, size_type __n)
Deallocate memory.
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.

struct std::allocator_traits< typename >"Uniform interface to all allocator types.

Since

C++11

The allocator type.

The allocator's const pointer type. Alloc::const_pointer if that type exists, otherwise pointer_traits<pointer>::rebind<const value_type>

The allocator's const void pointer type. Alloc::const_void_pointer if that type exists, otherwise pointer_traits<pointer>::rebind<const void>

The allocator's difference type. Alloc::difference_type if that type exists, otherwise pointer_traits<pointer>::difference_type

Whether all instances of the allocator type compare equal. Alloc::is_always_equal if that type exists, otherwise is_empty<Alloc>::type

The allocator's pointer type. Alloc::pointer if that type exists, otherwise value_type*

How the allocator is propagated on copy assignment. Alloc::propagate_on_container_copy_assignment if that type exists, otherwise false_type

How the allocator is propagated on move assignment. Alloc::propagate_on_container_move_assignment if that type exists, otherwise false_type

How the allocator is propagated on swap. Alloc::propagate_on_container_swap if that type exists, otherwise false_type

The allocator's size type. Alloc::size_type if that type exists, otherwise make_unsigned<difference_type>::type

The allocated type.

The allocator's void pointer type. Alloc::void_pointer if that type exists, otherwise pointer_traits<pointer>::rebind<void>

Allocate memory.

Parameters

Calls a.allocate(n)

Allocate memory.

Parameters

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)

Construct an object of type _Tp

Parameters

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...

References std::_Construct(), and std::forward().

Deallocate memory.

Parameters

Calls a.deallocate(p, n)

Destroy an object of type _Tp.

Parameters

Calls __a.destroy(__p) if that expression is well-formed, otherwise calls __p->~_Tp()

The maximum supported allocation size.

Parameters

Returns

Returns __a.max_size() if that expression is well-formed, otherwise returns numeric_limits<size_type>::max()

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