std::swap(std::function) - cppreference.com (original) (raw)

Overloads the std::swap algorithm for std::function. Exchanges the state of lhs with that of rhs. Effectively calls lhs.swap(rhs).

[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 << "std::swap(f1, f2);\n"; std::swap(f1, f2);   f1("f1", 1); f2("f2", 2); }

Output:

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

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit] See also