# std::allocator_arg

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< cpp‎ | memory

Defined in header `<memory>` |  |
constexpr std::allocator_arg_t allocator_arg = std::allocator_arg_t (); |  | (since C++11) (until C++17)
inline constexpr std::allocator_arg_t allocator_arg = std::allocator_arg_t (); |  | (since C++17)

`std::allocator_arg` is a constant of type std::allocator_arg_t used to disambiguate, at call site, the overloads of the constructors and member functions of allocator-aware objects, such as std::tuple, std::function, std::packaged_task, (until C++17)and std::promise.

### See also

allocator_arg_t (C++11) | tag type used to select allocator-aware constructor overloads (class)
uses_allocator (C++11) | checks if the specified type supports uses-allocator construction (class template)

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