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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_fstream_operator.htm below:

C++ fstream Operator

It supported feature version of C++ 11 standard. It acquires the contents of right hand side, by move-assigning its members and base classes.

Following is the declaration for fstream::operator=

copy (1)	fstream& operator= (const fstream&) = delete;
move (2)	fstream& operator= (fstream&& rhs);

rhs − Another fstream object.

It returns *this.

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

It modifies both stream objects (*this and rhs).

In below example explains about fstream operator= function.

#include <fstream>

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

   swap(foo,bar);

   foo << "tutorialspoint";

   foo.close();

   return 0;
}

fstream.htm

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