C++

Reference

<fstream>

fstream

public member function
<fstream>

std::fstream::swap

void swap (fstream& x);
Swap internals
Exchanges all internal data between x and *this.

Internally, the function calls iostream::swap and then calls the member swap of the associated filebuf object.

Parameters

x
Another fstream object.

Return Value

none

Example

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

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

  foo.swap(bar);

  foo << "lorem ipsum";

  foo.close();

  return 0;
}

Data races

Modifies both stream objects (*this and x).

Exception safety

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

See also

fstream::operator=
Move assignment (public member function)
iostream::swap
Swap internals (protected member function)