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std::piecewise_construct

De cppreference.com
< cpp‎ | utility
 
 
 
std::pair
Les fonctions membres
Original:
Member functions
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pair::pair
pair::operator=
pair::swap
Tiers fonctions
Original:
Non-member functions
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make_pair
operator=
operator!=
operator<
operator<=
operator>
operator>=
std::swap
get (C++11)
Classes d'aide
Original:
Helper classes
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tuple_size (C++11)
tuple_element (C++11)
 
constexpr piecewise_construct_t piecewise_construct = std::piecewise_construct_t();
(depuis C++11)
Le std::piecewise_construct constante est une instance d'un type de variable struct vide 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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[modifier] Exemple

[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);
}

Résultat :

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

[modifier] Voir aussi

type de variable utilisé pour sélectionner la surcharge fonctionnement correct de la construction par morceaux
Original:
tag type used to select correct function overload for piecewise construction
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(classe) [edit]