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std::function<R(Args...)>:: swap

From cppreference.net
C++
Utilities library
Function objects
Function invocation
(C++17) (C++23)
Identity function object
(C++20)
Old binders and adaptors
( until C++17* )
( until C++17* )
( until C++17* )
( until C++17* )
( until C++17* )
( until C++17* )
( until C++17* ) ( until C++17* ) ( until C++17* ) ( until C++17* )
( until C++20* )
( until C++20* )
( until C++17* ) ( until C++17* )
( until C++17* ) ( until C++17* )

( until C++17* )
( until C++17* ) ( until C++17* ) ( until C++17* ) ( until C++17* )
( until C++20* )
( until C++20* )
std::function
void swap ( function & other ) noexcept ;
(desde C++11)

Intercambia los objetos invocables almacenados de * this y other .

Contenidos

Parámetros

other - envoltorio de función para intercambiar el objeto invocable almacenado con

Valor de retorno

(ninguno)

Ejemplo

Ejecutar este código 
#include <functional>
#include <iostream>
void foo(const char* str, int x)
{
    std::cout << "foo(\"" << str << "\", " << x << ")\n";
}
void bar(const char* str, int x)
{
    std::cout << "bar(\"" << str << "\", " << x << ")\n";
}
int main()
{
    std::function<void(const char*, int)> f1{foo};
    std::function<void(const char*, int)> f2{bar};
    f1("f1", 1);
    f2("f2", 2);
    std::cout << "f1.swap(f2);\n";
    f1.swap(f2);
    f1("f1", 1);
    f2("f2", 2);
}

Salida: 

foo("f1", 1)
bar("f2", 2)
f1.swap(f2);
bar("f1", 1)
foo("f2", 2)

Véase también

intercambia los objetivos de dos objetos std::move_only_function
(función miembro pública de std::move_only_function )