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std::basic_ios::tie(3) C++ Standard Libary std::basic_ios::tie(3) NAME std::basic_ios::tie - std::basic_ios::tie Synopsis std::basic_ostream<CharT,Traits>* tie() const; (1) std::basic_ostream<CharT,Traits>* tie( std::basic_os- tream<CharT,Traits>* str ); (2) Manages the tied stream. A tied stream is an output stream which is synchronized with the sequence controlled by the stream buffer (rdbuf()), that is, flush() is called on the tied stream before any input/output operation on *this. 1) Returns the current tied stream. If there is no tied stream, a null pointer is returned. 2) Sets the current tied stream to str. Returns the tied stream be- fore the operation. If there is no tied stream, a null pointer is returned. Parameters str - an output stream to set as the tied stream Return value The tied stream, or a null pointer if there was no tied stream. Exceptions May throw implementation-defined exceptions. Notes By default, the standard stream cout is tied to cin and cerr. Simi- larly, its wide counterpart wcout is tied to wcin and wcerr. Example // Run this code #include <iostream> #include <fstream> #include <string> int main() { std::ofstream os("test.txt"); std::ifstream is("test.txt"); std::string value("0"); os << "Hello"; is >> value; std::cout << "Result before tie(): \"" << value << "\"\n"; is.clear(); is.tie(&os); is >> value; std::cout << "Result after tie(): \"" << value << "\"\n"; } Output: Result before tie(): "0" Result after tie(): "Hello" http://cppreference.com 2022.07.31 std::basic_ios::tie(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Notes | Example | Output:
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