Difference between revisions of "cpp/header/iostream"
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===Defect reports=== | ===Defect reports=== | ||
Latest revision as of 07:51, 27 November 2023
This header is part of the Input/output library.
Including <iostream> behaves as if it defines a static storage duration object of type std::ios_base::Init, whose constructor initializes the standard stream objects if it is the first std::ios_base::Init object to be constructed, and whose destructor flushes those objects (except for cin and wcin) if it is the last std::ios_base::Init object to be destroyed.
Includes | ||
| (C++11) |
std::ios_base class, std::basic_ios class template and typedefs | |
| (C++11) |
std::basic_streambuf class template | |
| (C++11) |
std::basic_istream class template and typedefs | |
| (C++11) |
std::basic_ostream, std::basic_iostream class templates and typedefs | |
Objects | ||
| reads from the standard C input stream stdin (global object) | ||
| writes to the standard C output stream stdout (global object) | ||
| writes to the standard C error stream stderr, unbuffered (global object) | ||
| writes to the standard C error stream stderr (global object) | ||
[edit] Synopsis
#include <ios> #include <streambuf> #include <istream> #include <ostream> namespace std { extern istream cin; extern ostream cout; extern ostream cerr; extern ostream clog; extern wistream wcin; extern wostream wcout; extern wostream wcerr; extern wostream wclog; }
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 155 | C++98 | the type of the static object was std::basic_ios::Init(not strictly wrong, but the wording was misleading) |
corrected to std::ios_base::Init
|
| LWG 1123 | C++98 | including <iostream> did not guarantee theconstruction of std::ios_base::Init objects |
guarantees |
