__gnu_cxx::__alloc_traits< _Alloc, typename >(3)

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
The allocator's const void pointer type.
typedef _Base_type::difference_type difference_type
using is_always_equal
Whether all instances of the allocator type compare equal.
typedef _Base_type::pointer pointer
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
typedef value_type & reference
typedef _Base_type::size_type size_type
typedef _Base_type::value_type value_type
using void_pointer
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 [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 [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 [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 [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 [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 [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
    __a An allocator.
    __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
    __a An allocator.
    __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
    __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)

References std::forward().

  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
    __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)

  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
    __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...

  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)

  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
    __a An allocator.
    __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
    __a An allocator.
    __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
    __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()

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

References std::forward().

Author

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