std::allocator_arg(3) C++ Standard Libary std::allocator_arg(3) NAME std::allocator_arg - std::allocator_arg Synopsis Defined in header <memory> struct allocator_arg_t { explicit allocator_arg_t() = default; }; (since C++11) constexpr std::allocator_arg_t allocator_arg = (since C++11) std::allocator_arg_t(); (until C++17) inline constexpr std::allocator_arg_t allocator_arg = (since C++17) std::allocator_arg_t(); std::allocator_arg_t is an empty class type used to disambiguate the overloads of constructors and member functions of allocator-aware objects, including std::tuple , std::function, std::packaged_task, (until C++17) and std::promise. std::allocator_arg is a constant of it. 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 2510 C++11 the default constructor was non-explicit, which made explicit could lead to ambiguity See also uses_allocator checks if the specified type supports uses-allocator con- struction (C++11) (class template) http://cppreference.com 2024.06.10 std::allocator_arg(3)
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