std::function<R(Args...)>::swap - cppreference.com (original) (raw)

| void swap( function& other ) noexcept; | | (since C++11) | | -------------------------------------- | | ------------- |

Exchanges the stored callable objects of *this and other.

[edit] Parameters

[edit] Return value

(none)

[edit] Example

#include #include   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); }

Output:

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

[edit] See also

| | swaps the targets of two std::move_only_function objects (public member function of std::move_only_function) [edit] | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |