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 |
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(C++11) | std::ios_base class, std::basic_ios class template and several typedefs |
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(C++11) | std::basic_streambuf class template |
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(C++11) | std::basic_istream class template and several typedefs |
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(C++11) | std::basic_ostream, std::basic_iostream class templates and several typedefs |
Objects |
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reads from the standard C input stream stdin (global object) |
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writes to the standard C output stream stdout(global object) |
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writes to the standard C error stream stderr, unbuffered(global object) |
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writes to the standard C error stream stderr(global object) |
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#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;
}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 |
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