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std::basic_ios::rdbuf(3) C++ Standard Libary std::basic_ios::rdbuf(3) NAME std::basic_ios::rdbuf - std::basic_ios::rdbuf Synopsis std::basic_streambuf<CharT, Traits>* rdbuf() const; (1) std::basic_streambuf<CharT, Traits>* rdbuf( std::basic_stream- buf<CharT, (2) Traits>* sb ); Manages the associated stream buffer. 1) Returns the associated stream buffer. If there is no associated stream buffer, returns a null pointer. 2) Sets the associated stream buffer to sb. The error state is cleared by calling clear(). Returns the associated stream buffer before the operation. If there is no associated stream buffer, returns a null pointer. Parameters sb - stream buffer to associate to Return value The associated stream buffer, or a null pointer if there was no as- sociated stream buffer. Exceptions May throw implementation-defined exceptions. Example // Run this code #include <iostream> #include <sstream> int main() { std::ostringstream local; auto cout_buff = std::cout.rdbuf(); // save pointer to std::cout buffer std::cout.rdbuf(local.rdbuf()); // substitute internal std::cout buffer with // buffer of 'local' object // now std::cout work with 'local' buffer // you don't see this message std::cout << "some message"; // go back to old buffer std::cout.rdbuf(cout_buff); // you will see this message std::cout << "back to default buffer\n"; // print 'local' content std::cout << "local content: " << local.str() << "\n"; } Output: back to default buffer local content: some message See also set_rdbuf replaces the rdbuf without clearing its error state (protected member function) http://cppreference.com 2022.07.31 std::basic_ios::rdbuf(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Example | Output: | See also
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