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std::allocator_arg_t

STD：：分配器[医]阿格[医]T型

Defined in header ​​
struct allocator_arg_t {};​(since C++11) (until C++17)
struct allocator_arg_t { explicit allocator_arg_t() = default; };​(since C++17)

std::allocator_arg_t是一种空类类型，用于消除对分配器对象的构造函数和成员函数的重载的歧义，包括std::tuple，，，std::function，，，std::promise，和std::packaged_task...

另见

allocator_arg (C++11)an object of type std::allocator_arg_t used to select allocator-aware constructors (constant)
uses_allocator (C++11)checks if the specified type supports uses-allocator construction (class template)

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http：//en.cppreference.com/w/cpp/Memory/allocator[医]阿格[医]T型

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