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std::piecewise_construct_t

提供: cppreference.com
< cpp‎ | utility

 
 
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Defined in header <utility>
struct piecewise_construct_t { };
(C++11およびそれ以降)

std::piecewise_construct_t is an empty struct tag type used to disambiguate between different functions that take two tuple arguments.

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.

[編集]

[edit]
#include <iostream>
#include <utility>
#include <tuple>
 
struct Foo {
    Foo(std::tuple<int, float>) 
    {
        std::cout << "Constructed a Foo from a tuple\n";
    }
    Foo(int, float) 
    {
        std::cout << "Constructed a Foo from an int and a float\n";
    }
};
 
int main()
{
    std::tuple<int, float> t(1, 3.14);
    std::pair<Foo, Foo> p1(t, t);
    std::pair<Foo, Foo> p2(std::piecewise_construct, t, t);
}

Output:

Constructed a Foo from a tuple
Constructed a Foo from a tuple
Constructed a Foo from an int and a float
Constructed a Foo from an int and a float

[編集] も参照してください

型のオブジェクトpiecewise_construct_tは、区分的に構築するための機能を明確にするために使用
Original:
an object of type piecewise_construct_t used to disambiguate functions for piecewise construction
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(定数) [edit]