std::piecewise_construct
De cppreference.com
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
#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
(C++11) | 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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (classe) |
