std::basic_ios::operator bool

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C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Input/output library
I/O manipulators C-style I/O Buffers basic_streambuf basic_filebuf basic_stringbuf strstreambuf (deprecated) Streams Abstractions ios_base basic_ios basic_istream basic_ostream basic_iostream File I/O basic_ifstream basic_ofstream basic_fstream String I/O basic_istringstream basic_ostringstream basic_stringstream Array I/O istrstream (deprecated) ostrstream (deprecated) Types streamoff streampos fpos Error category interface iostream_category (C++11) io_errc (C++11)
std::basic_ios
Member functions basic_ios::basic_ios basic_ios::~basic_ios State functions basic_ios::good basic_ios::eof basic_ios::fail basic_ios::bad basic_ios::operator! basic_ios::operator bool basic_ios::rdstate basic_ios::setstate basic_ios::clear Formatting basic_ios::copyfmt basic_ios::fill Miscellaneous basic_ios::exceptions basic_ios::imbue basic_ios::rdbuf basic_ios::tie basic_ios::narrow basic_ios::widen

operator bool() const;		(until C++11)
explicit operator bool() const;		(since C++11)

Returns true if the stream has no errors occurred and is ready of I/O operations. Specifically, returns result of rdstate() == 0.

Contents 1 Parameters 2 Return value 3 Example 4 See also

[edit] Parameters

(none)

[edit] Return value

true if the stream has no errors occurred, false otherwise.

[edit] Example

This section is incomplete

[edit] See also

good	checks if no error has occurred i.e. I/O operations are available (public member function)
bad	checks if a non-recoverable error has occurred (public member function)
fail	checks if a recoverable error has occurred (public member function)
eof	checks if end-of-file has been reached (public member function)
operator!	checks if an error has occurred (synonym of fail()) (public member function)