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std::piecewise_construct

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< cpp‎ | utility

 
 
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
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constexpr piecewise_construct_t piecewise_construct = std::piecewise_construct_t();
(desde C++11)
El std::piecewise_construct constante es una instancia de un tipo struct etiqueta vacía std::piecewise_construct_t .
Original:
The constant std::piecewise_construct is an instance of an empty struct tag type std::piecewise_construct_t.
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[editar] Ejemplo

[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

[editar] Ver también

tipo de variable utilizada para seleccionar sobrecarga de función correcto para la construcción por segmentos
Original:
tag type used to select correct function overload for piecewise construction
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(clase) [edit]