A virtual function called to locate the first character in a range that matches a specified mask.
virtual const CharType *do_scan_is( mask _MaskVal, const CharType* _First, const CharType* _Last, ) const;
- The mask value to be matched by a character.
- A pointer to the first character in the range to be scanned.
- A pointer to the last character in the range to be scanned.
A pointer to the first character in a range that does match a specified mask. If no such value exists, the function returns _Last.
The protected member function returns the smallest pointer _Ptr in the range [_First, _Last) for which do_is(_MaskVal, *_Ptr) is true.
See the example for scan_is, which calls do_scan_is.