FreeBSD Manual Pages
std::ios_base::Init(3) C++ Standard Libary std::ios_base::Init(3) NAME std::ios_base::Init - std::ios_base::Init Synopsis class Init; This class is used to ensure that the default C++ streams (std::cin, std::cout, etc.) are properly initialized and destructed. The class tracks how many instances of it are created and initializes the C++ streams when the first in- stance is constructed as well as flushes the output streams when the last in- stance is destructed. The header <iostream> behaves as if it defines (directly or indi- rectly) an instance of std::ios_base::Init with static storage duration: this makes it safe to access the standard I/O streams in the constructors and destructors of sta- tic objects with ordered initialization (as long as <iostream> is included in the translation unit before these objects were defined). Each C++ library module in a hosted implementation behaves as if it contains an interface unit that defines an unexported std::ios_base::Init variable with ordered initialization. (since C++23) As a result, the definition of that variable is appearance-ordered before any declaration following the point of importation of a C++ library module. Whether such a definition exists is unobservable by a program that does not reference any of the standard iostream ob- jects. Member functions constructor initializes the default C++ streams if they have not been created yet (public member function) flushes the default C++ streams if *this is the last instance to be destructor destroyed (public member function) Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior the behaviors of the constructor and the LWG 1123 C++98 destructor re- moved the dependency depend on an exposition-only static data member init_cnt See also cin reads from the standard C input stream stdin wcin (global object) cout writes to the standard C output stream stdout wcout (global object) cerr writes to the standard C error stream stderr, unbuffered wcerr (global object) clog writes to the standard C error stream stderr wclog (global object) http://cppreference.com 2024.06.10 std::ios_base::Init(3)
NAME | Synopsis | Member functions | See also
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=std::ios_base::Init&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>