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std::basic_stringbuf<CharT,Traits,Allocator>::operator= - cppreference.com

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std::basic_stringbuf& operator=( std::basic_stringbuf&& rhs );

 (1) (since C++11)

std::basic_stringbuf& operator=( const std::basic_stringbuf& rhs ) = delete;

 (2)

1) Move assignment operator: Moves the contents of rhs into *this. After the move, *this has the associated string, the open mode, the locale, and all other state formerly held by rhs. The six pointers of std::basic_streambuf in *this are guaranteed to be different from the corresponding pointers in the moved-from rhs unless null.

2) The copy assignment operator is deleted; basic_stringbuf is not CopyAssignable.

Parameters

rhs - another basic_stringbuf that will be moved from

Return value

*this

Example

#include <iostream>
#include <sstream>
#include <string>

int main()
{
    std::istringstream one("one");
    std::ostringstream two("two");

    std::cout << "Before move, one = \"" << one.str() << '"'
              << " two = \"" << two.str() << "\"\n";

    *one.rdbuf() = std::move(*two.rdbuf());

    std::cout << "After move, one = \"" << one.str() << '"'
              << " two = \"" << two.str() << "\"\n";
}

Output: 

Before move, one = "one" two = "two"
After move, one = "two" two = ""

See also