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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,  in-
       cluding 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
       Correct 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
       construction
	  (C++11)	 (class	template)

http://cppreference.com		  2022.07.31		 std::allocator_arg(3)

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