std::error_code(3)         Library Functions Manual         std::error_code(3)

NAME
       std::error_code

SYNOPSIS
       #include <system_error>

   Public Member Functions
       template<typename _ErrorCodeEnum , typename  = _Check<_ErrorCodeEnum>>
           error_code (_ErrorCodeEnum __e) noexcept
           Initialize with a user-defined type, by calling make_error_code.
       error_code (const error_code &)=default
       error_code (int __v, const error_category &__cat) noexcept
       void assign (int __v, const error_category &__cat) noexcept
       const error_category & category () const noexcept
           The error category that this error belongs to.
       void clear () noexcept
       error_condition default_error_condition () const noexcept
           An error_condition for this error's category and value.
       string message () const
           The category's description of the value.
       operator bool () const noexcept
           Test whether value() is non-zero.
       error_code & operator= (const error_code &)=default
       int value () const noexcept
           The error value.

   Related Symbols
       (Note that these are not member symbols.)
       error_code make_error_code (errc __e) noexcept
       bool operator!= (const error_code &__lhs, const error_code &__rhs)
           noexcept
       bool operator!= (const error_code &__lhs, const error_condition &__rhs)
           noexcept
       bool operator< (const error_code &__lhs, const error_code &__rhs)
           noexcept
       template<typename _CharT , typename _Traits > basic_ostream< _CharT,
           _Traits > & operator<< (basic_ostream< _CharT, _Traits > &__os,
           const error_code &__e)

Detailed Description
       Class error_code

       This class is a value type storing an integer error number and a
       category that gives meaning to the error number. Typically this is done
       close the the point where the error happens, to capture the original
       error value.

       An error_code object can be used to store the original error value
       emitted by some subsystem, with a category relevant to the subsystem.
       For example, errors from POSIX library functions can be represented by
       an errno value and the 'generic' category, but errors from an HTTP
       library might be represented by an HTTP response status code (e.g. 404)
       and a custom category defined by the library.

       Since
           C++11

Constructor & Destructor Documentation
   template<typename _ErrorCodeEnum , typename  = _Check<_ErrorCodeEnum>>
       std::error_code::error_code (_ErrorCodeEnum __e) [inline],  [noexcept]
       Initialize with a user-defined type, by calling make_error_code.

       References make_error_code().

Member Function Documentation
   const error_category & std::error_code::category () const [inline],
       [noexcept]
       The error category that this error belongs to.

       Referenced by message().

   error_condition std::error_code::default_error_condition () const
       [noexcept]
       An error_condition for this error's category and value.

   string std::error_code::message () const [inline]
       The category's description of the value.

       References category(), and value().

   std::error_code::operator bool () const [inline],  [explicit],  [noexcept]
       Test whether value() is non-zero.

   int std::error_code::value () const [inline],  [noexcept]
       The error value.

       Referenced by message().


Author
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                                   libstdc++                std::error_code(3)