explicit operator bool() const; (since C++11) Checks if the error value is valid, i.e. non-zero. Parameters (none). Return value false if value() == 0, true otherwise. Exceptions noexcept specification: noexcept

const error_category& category() const; (since C++11) Returns the stored error category. Parameters (none). Return value The stored error category. Exceptions noexcept specification: noexcept

Defined in header <system_error> class error_condition; (since C++11) std::error_condition is a platform-independent error code. Like std::error_code, it is uniquely identified by an integer value and a std::error_category, but unlike std::error_code, the value is not platform-dependent. A typical implementation holds one integer data member (the value) and a pointer to an std::error_category. Member functions (constructor) constructs an error_condition (public membe

Defined in header <system_error> class error_code; (since C++11) std::error_code is a platform-dependent error code. Each std::error_code object holds a pair of error code originating from the operating system, or some low-level interface and a pointer to an object of type std::error_category, which corresponds to the said interface. The error code values may be not unique across different error categories. Member functions (constructor) constructs an error code (pub

void assign( int ec, const error_category& ecat ); (since C++11) Replaces the contents with error code ec and corresponding category ecat. Parameters ec - platform-dependent error code enum to assign ecat - error category corresponding to ec Return value (none). Exceptions noexcept specification: noexcept See also operator= assigns another error code (public member function)

std::error_condition default_error_condition() const; (since C++11) Returns the default error condition for the current error value. Equivalent to category().default_error_condition(value()). Parameters (none). Return value The default error condition for the current error value. Exceptions noexcept specification: noexcept

const std::error_category& category() const; (since C++11) Returns the error category of the error value. Parameters (none). Return value The error category of the error value. Exceptions noexcept specification: noexcept See also value obtains the value of the error_code (public member function)

void clear(); (since C++11) Replaces the error code and error category with default values. Equivalent to *this = error_code(0, std::system_category()). Parameters (none). Return value (none). Exceptions noexcept specification: noexcept

bool operator==( const error_category& rhs ) const; (1) (since C++11) bool operator!=( const error_category& rhs ) const; (2) (since C++11) bool operator<( const error_category& rhs ) const; (3) (since C++11) Compares to another error category. 1) Checks whether *this and rhs refer to the same object. 2) Checks whether *this and rhs do not refer to the same object. 3) Orders *this and rhs by the order of this and &rhs. Equivalent to std::less<const e

virtual std::error_condition default_error_condition( int code ) const; (since C++11) Returns the error condition for the given error code. Equivalent to std::error_condition(code, *this). Parameters code - error code for which to return error condition Return value The error condition for the given error code. Exceptions noexcept specification: noexcept