std::allocator_arg, std::allocator_arg_t
From cppreference.com
C++
Memory management library
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Defined in header <memory>
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struct allocator_arg_t {
explicit allocator_arg_t(
)
=
default
;
}
;
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(1) | (since C++11) |
constexpr
std::allocator_arg_t allocator_arg {
}
;
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(2) | (since C++11) (inline since C++17) |
1)
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
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
LWG 2510 | C++11 | the default constructor was non-explicit, which could lead to ambiguity | made explicit |
See also
(C++11)
|
checks if the specified type supports uses-allocator construction (class template) |