[allocator.traits.general]

The class template allocator_traits supplies a uniform interface to all allocator types.

An allocator cannot be a non-class type, however, even if allocator_traits supplies the entire required interface.

Thus, it is always possible to create a derived class from an allocator.

— end note]

namespace std { template<class Alloc> struct allocator_traits { using allocator_type = Alloc; using value_type = typename Alloc::value_type; using pointer = see below; using const_pointer = see below; using void_pointer = see below; using const_void_pointer = see below; using difference_type = see below; using size_type = see below; using propagate_on_container_copy_assignment = see below; using propagate_on_container_move_assignment = see below; using propagate_on_container_swap = see below; using is_always_equal = see below; template<class T> using rebind_alloc = see below; template<class T> using rebind_traits = allocator_traits<rebind_alloc<T>>; [[nodiscard]] static constexpr pointer allocate(Alloc& a, size_type n); [[nodiscard]] static constexpr pointer allocate(Alloc& a, size_type n, const_void_pointer hint); static constexpr void deallocate(Alloc& a, pointer p, size_type n); template<class T, class... Args> static constexpr void construct(Alloc& a, T* p, Args&&... args); template<class T> static constexpr void destroy(Alloc& a, T* p); static constexpr size_type max_size(const Alloc& a) noexcept; static constexpr Alloc select_on_container_copy_construction(const Alloc& rhs); }; }

20 General utilities library [utilities]

20.10 Memory [memory]

20.10.9 Allocator traits [allocator.traits]

20.10.9.1 General [allocator.traits.general]