Defined in header <system_error> bool operator==( const error_code& lhs, const error_code& rhs ); (1) (since C++11) bool operator!=( const error_code& lhs, const error_code& rhs ); (1) (since C++11) bool operator<( const error_code& lhs, const error_code& rhs ); (1) (since C++11) Compares two error code objects. 1) Compares lhs and rhs for equality. 2) Compares lhs and rhs for equality. 3) Checks whether lhs is less than rhs. Par

bool failed() const; Returns true if the iterator encountered the end-of-file condition, that is, if an earlier call to std::basic_streambuf::sputc (made by operator=) returned Traits::eof. Parameters (none). Return value true if this iterator has encountered the end-of-file condition on output, false otherwise. Exceptions (none) (until C++11) noexcept specification: noexcept (since C++11) Example

ostreambuf_iterator( streambuf_type* buffer ); (1) ostreambuf_iterator( ostream_type& stream ); (2) 1) Constructs the iterator with the private streambuf_type* member set to buffer and the failed() bit set to false. The behavior is undefined if buffer is a null pointer. 2) Same as ostreambuf_iterator(stream.rdbuf()) Parameters stream - the output stream whose rdbuf() will be accessed by this iterator buffer - the output stream buffer to be accessed by this ite

Defined in header <iterator> template< class CharT, class Traits = std::char_traits<CharT> > class ostreambuf_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void> (until C++17) template< class CharT, class Traits = std::char_traits<CharT> > class ostreambuf_iterator; (since C++17) std::ostreambuf_iterator is a single-pass OutputIterator that writes successive ch

ostreambuf_iterator& operator++(); ostreambuf_iterator& operator++( int ); Does nothing. These operator overloads are provided to satisfy the requirements of OutputIterator. They make it possible for the expressions *iter++=value and *++iter=value to be used to output (insert) a value into the underlying stream. Parameters (none). Return value *this.

Defined in header <locale> (1) public: iter_type put( iter_type out, std::ios_base& str, char_type fill, bool v ) const; iter_type put( iter_type out, std::ios_base& str, char_type fill, long v ) const; iter_type put( iter_type out, std::ios_base& str, char_type fill, long long v ) const; iter_type put( iter_type out, std::ios_base& str, char_type fill, unsigned long v ) const; iter_type put( iter_type out, std::ios_base& str, char_type fi

Defined in header <system_error> template< class CharT, class Traits > std::basic_ostream<CharT,Traits>& operator<<( basic_ostream<CharT,Traits>& os, const error_code& ec ); (since C++11) Performs stream output operation on error code ec. Equivalent to os << ec.category().name() << ':' << ec.value. Parameters os - output stream to insert data to ec - error code Return value os.

Defined in header <mutex> class once_flag; (since C++11) The class std::once_flag is a helper structure for std::call_once. An object of type std::once_flag that is passed to multiple calls to std::call_once allows those calls to coordinate with each other such that only one of the calls will actually run to completion. std::once_flag is neither copyable nor movable. Member functions std::once_flag::once_flag constexpr once_flag(); Constructs an once_flag obje

Defined in header <locale> explicit num_put( std::size_t refs = 0 ); Creates a std::num_put facet and forwards the starting reference count refs to the base class constructor, locale::facet::facet(). Parameters refs - starting reference count

Defined in header <locale> template< class CharT, class OutputIt = std::ostreambuf_iterator<CharT> > class num_put; Class std::num_put encapsulates the rules for formatting numeric values as strings. Specifically, the types bool, long, unsigned long, long long, unsigned long long, double, long double, void*, and of all types implicitly convertible to these (such as int or float) are supported. The standard formatting output operators (such as cout <&