isctype()

template<typename _Ch_type>

bool std::regex_traits< _Ch_type >::isctype	(	_Ch_type	__c,
		char_class_type	__f ) const

Determines if c is a member of an identified class.

Parameters

__c	a character.
__f	a class type (as returned from lookup_classname).

Returns

true if the character __c is a member of the classification represented by __f, false otherwise.

Exceptions

std::bad_cast

if the current locale does not have a ctype facet.

Definition at line 393 of file regex.tcc.

    {
      typedef std::ctype<char_type> __ctype_type;
      const __ctype_type& __fctyp(use_facet<__ctype_type>(_M_locale));
 
      return __fctyp.is(__f._M_base, __c)
      // [[:w:]]
      || ((__f._M_extended & _RegexMask::_S_under)
          && __c == __fctyp.widen('_'));
    }

References regex_traits(), std::regex_traits< _Ch_type >::_RegexMask::_M_base, std::regex_traits< _Ch_type >::_RegexMask::_M_extended, _M_locale, std::regex_traits< _Ch_type >::_RegexMask::_S_under, and std::use_facet().

Here is the call graph for this function: