C++ Fstream Library - Swap Function

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Description

It exchanges the values of the fstream objects x and y.

Declaration

Following is the declaration for fstream::swap.

C++11

template <class charT, class traits>
  void swap (basic_fstream<charT,traits>& x, basic_fstream<charT,traits>& y);

Parameters

• x,y − basic_fstream objects of the same type (i.e., having both the same template parameters, charT and traits).

Return Value

none

Exceptions

No-throw guarantee − this member function never throws exceptions.

Data races

Both objects, x and y, are modified.

Example

In below example explains about fstream swap function.

#include <fstream>

int main () {
   std::fstream foo;
   std::fstream bar ("test.txt");

   swap(foo,bar);

   foo << "tutorialspoint";

   foo.close();

   return 0;
}