std::function<R(Args...)>::swap
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std::function
void swap( function& other ) noexcept;
(since C++11)
Exchanges the stored callable objects of *this and other.
Contents
[edit] Parameters
other
-
function wrapper to exchange the stored callable object with
[edit] Return value
(none)
[edit] Example
Run this code
#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); }
Output:
foo("f1", 1)
bar("f2", 2)
f1.swap(f2);
bar("f1", 1)
foo("f2", 2)