std::piecewise_construct, std::piecewise_construct_t
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| Defined in header <utility>
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| struct piecewise_construct_t { explicit piecewise_construct_t() = default; }; |
(1) | (since C++11) |
| constexpr std::piecewise_construct_t piecewise_construct{}; |
(2) | (since C++11) (inline since C++17) |
1)
std::piecewise_construct_t is an empty class tag type used to disambiguate between different functions that take two tuple arguments.2) The constant
std::piecewise_construct is an instance of (1).The overloads that do not use std::piecewise_construct_t assume that each tuple argument becomes the element of a pair. The overloads that use std::piecewise_construct_t assume that each tuple argument is used to construct, piecewise, a new object of specified type, which will become the element of the pair.
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[edit] Standard library
The following standard library types and functions use it as a disambiguation tag:
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