[allocator.traits.members]

# 20 Memory management library [[mem]](./#mem)

## 20.2 Memory [[memory]](memory#allocator.traits.members)

### 20.2.9 Allocator traits [[allocator.traits]](allocator.traits#members)

#### 20.2.9.3 Static member functions [allocator.traits.members]

[🔗](#lib:allocate,allocator_traits)

`static constexpr pointer allocate(Alloc& a, size_type n);
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1851)

*Returns*: a.allocate(n)[.](#1.sentence-1)

[🔗](#lib:allocate,allocator_traits_)

`static constexpr pointer allocate(Alloc& a, size_type n, const_void_pointer hint);
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1862)

*Returns*: a.allocate(n, hint) if that expression is well-formed; otherwise, a.allocate(n)[.](#2.sentence-1)

[🔗](#lib:allocate_at_least,allocator_traits)

`static constexpr allocation_result<pointer, size_type> allocate_at_least(Alloc& a, size_type n);
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1873)

*Returns*: a.allocate_at_least(n) if that expression is well-formed;
otherwise, {a.allocate(n), n}[.](#3.sentence-1)

[🔗](#lib:deallocate,allocator_traits)

`static constexpr void deallocate(Alloc& a, pointer p, size_type n);
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1885)

*Effects*: Calls a.deallocate(p, n)[.](#4.sentence-1)

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1889)

*Throws*: Nothing[.](#5.sentence-1)

[🔗](#lib:construct,allocator_traits)

`template<class T, class... Args>
  static constexpr void construct(Alloc& a, T* p, Args&&... args);
`

[6](#6)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1901)

*Effects*: Calls a.construct(p, std​::​forward<Args>(args)...) if that call is well-formed;
otherwise, invokes construct_at(p, std​::​forward<Args>(args)...)[.](#6.sentence-1)

[🔗](#lib:destroy,allocator_traits)

`template<class T>
  static constexpr void destroy(Alloc& a, T* p);
`

[7](#7)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1915)

*Effects*: Calls a.destroy(p) if that call is well-formed; otherwise, invokesdestroy_at(p)[.](#7.sentence-1)

[🔗](#lib:max_size,allocator_traits)

`static constexpr size_type max_size(const Alloc& a) noexcept;
`

[8](#8)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1927)

*Returns*: a.max_size() if that expression is well-formed; otherwise,numeric_limits<size_type>​::​​max() / sizeof(value_type)[.](#8.sentence-1)

[🔗](#lib:select_on_container_copy_construction,allocator_traits)

`static constexpr Alloc select_on_container_copy_construction(const Alloc& rhs);
`

[9](#9)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L1939)

*Returns*: rhs.select_on_container_copy_construction() if that expression is
well-formed; otherwise, rhs[.](#9.sentence-1)