std::basic_filebuf<CharT,Traits>::swap - cppreference.com (original) (raw)
Swaps the state and the contents of *this and rhs.
[edit] Parameters
| rhs | - | another basic_filebuf |
|---|
[edit] Return value
(none)
[edit] Notes
This function is called automatically when swapping std::fstream objects, it is rarely necessary to call it directly.
[edit] Example
#include #include #include int main() { std::ifstream fin("test.in"); // read-only std::ofstream fout("test.out"); // write-only std::string s; getline(fin, s); std::cout << s << '\n'; // outputs the first line of test.in fin.rdbuf()->swap(*fout.rdbuf()); //swap the underlying buffers getline(fin, s); // fails: cannot read from a write-only filebuf std::cout << s << '\n'; // prints empty line }