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std::allocator_traits(3) C++ Standard Libary std::allocator_traits(3) NAME std::allocator_traits - std::allocator_traits Synopsis Defined in header <memory> template< class Alloc > (since C++11) struct allocator_traits; The allocator_traits class template provides the standardized way to access various properties of Allocators. The standard containers and other standard library components access allocators through this template, which makes it possible to use any class type as an allocator, as long as the user-provided spe- cialization of allocator_traits implements all required functionality. The default, non-specialized, allocator_traits contains the follow- ing members: Member types Type Definition allocator_type Alloc value_type Alloc::value_type pointer Alloc::pointer if present, otherwise value_type* Alloc::const_pointer if present, otherwise const_pointer std::pointer_traits<pointer>::rebind<const value_type> void_pointer Alloc::void_pointer if present, otherwise std::pointer_traits<pointer>::re- bind<void> Alloc::const_void_pointer if present, const_void_pointer otherwise std::pointer_traits<pointer>::re- bind<const void> difference_type Alloc::difference_type if present, otherwise std::pointer_traits<pointer>::dif- ference_type size_type Alloc::size_type if present, otherwise std::make_unsigned<differ- ence_type>::type propagate_on_container_copy_assignment Alloc::propagate_on_con- tainer_copy_assignment if present, otherwise std::false_type propagate_on_container_move_assignment Alloc::propagate_on_con- tainer_move_assignment if present, otherwise std::false_type propagate_on_container_swap Alloc::propagate_on_con- tainer_swap if present, otherwise std::false_type is_always_equal Alloc::is_always_equal if present, otherwise std::is_empty<Alloc>::type Member alias templates Type Definition rebind_alloc<T> Alloc::rebind<T>::other if present, otherwise Al- loc<T, Args> if this Alloc is Alloc<U, Args> rebind_traits<T> std::allocator_traits<rebind_alloc<T>> Member functions allocate allocates uninitialized stor- age using the [static] allocator (public static member func- tion) deallocate deallocates storage using the allocator [static] (public static member func- tion) construct constructs an object in the allocated storage [static] (function template) destroy destructs an object stored in the allocated [static] storage (function template) max_size returns the maximum object size supported by [static] the allocator (public static member func- tion) select_on_container_copy_construction obtains the allocator to use after copying a [static] standard container (public static member func- tion) Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior LWG 2108 C++11 there was no way to show an allocator is_al- ways_equal provided is stateless See also allocator the default allocator (class template) scoped_allocator_adaptor implements multi-level allocator for multi- level containers (C++11) (class template) pointer_traits provides information about pointer-like types (C++11) (class template) http://cppreference.com 2022.07.31 std::allocator_traits(3)
NAME | Synopsis | Member types | Member alias templates | Member functions | See also
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