C++

Reference

<fstream>

ifstream

public member function
<fstream>

std::ifstream::swap

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

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

Parameters

x
Another ifstream object.

Return Value

none

Example

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// swapping ifstream objects #include <iostream> // std::cout #include <fstream> // std::ifstream int main () { std::ifstream foo; std::ifstream bar ("test.txt"); foo.swap(bar); char c = foo.get(); while (foo.good()) { std::cout << c; c = foo.get(); } 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

ifstream::operator=
Move assignment (public member function)
istream::swap
Swap internals (protected member function)