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

      From cppreference.com
      <cpp‎ |utility‎ |functional‎ |function
       
       
      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*)
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      (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*)
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      void swap( function& other)noexcept;
      		(since C++11)

      Exchanges the stored callable objects of*this andother.

      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(constchar* str,int x){std::cout<<"foo(\""<< str<<"\", "<< x<<")\n";} void bar(constchar* str,int x){std::cout<<"bar(\""<< str<<"\", "<< x<<")\n";} int main(){std::function<void(constchar*,int)> f1{foo};std::function<void(constchar*,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 twostd::move_only_function objects
      (public member function ofstd::move_only_function)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/function/swap&oldid=176857"
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