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; }