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std::ios_base::Init

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< cpp‎ | io‎ | ios base
Revision as of 15:38, 18 December 2013 by Cubbi (Talk | contribs)

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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 instance is constructed as well as flushes the output streams when the last instance is destructed.

The header <iostream> declares (directly or indirectly) an instance of std::ios_base::Init with static storage duration, whose definition is provided by the C++ library: this makes it safe to access the standard I/O streams in the constructors and destructors of static objects (as long as #include <iostream> is present in the translation unit)

[edit] Member functions

(constructor)
if *this is the first instance created, initializes the default C++ streams
(public member function)
(destructor)
if *this is the last instance created, flushes the default C++ streams
(public member function)

[edit] See also

reads from the standard C input stream stdin
(global object) [edit]
writes to the standard C output stream stdout
(global object) [edit]
writes to the standard C error stream stderr, unbuffered
(global object) [edit]
writes to the standard C error stream stderr
(global object) [edit]