C++

Reference

<fstream>

ofstream

function template
<fstream>

std::swap (basic_ofstream)

void swap (ofstream& x, ofstream& y);
Swap output file streams
Exchanges the values of the ofstream objects x and y.

This is an overload of the generic algorithm swap that behaves as if x.swap(y) was called.

Parameters

x,y
ofstream objects to swap.

Return value

none

Example

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// swapping ofstream objects
#include <fstream>      // std::ofstream

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

  swap(foo,bar);

  foo << "lorem ipsum";

  foo.close();

  return 0;
}

Data races

Both objects, x and y, are modified.

Exception safety

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

See also

ofstream::swap
Swap internals (public member function)
ofstream::operator=
Move assignment (public member function)