std::ctype<CharT>::scan_is,std::ctype<CharT>::do_scan_is (3) - Linux Manuals

std::ctype<CharT>::scan_is,std::ctype<CharT>::do_scan_is: std::ctype<CharT>::scan_is,std::ctype<CharT>::do_scan_is

NAME

std::ctype<CharT>::scan_is,std::ctype<CharT>::do_scan_is - std::ctype<CharT>::scan_is,std::ctype<CharT>::do_scan_is

Synopsis

Defined in header <locale>
public: (1)
const CharT* scan_is( mask m, const CharT* beg, const CharT* end ) const;
protected: (2)
virtual const CharT* do_scan_is( mask m, const CharT* beg, const CharT* end) const;

1) public member function, calls the protected virtual member function do_scan_is of the most derived class.
2) Locates the first character in the character array [beg, end) that satisfies the classification mask m, that is, the first character c such that is(m, c) would return true.

Parameters

m - mask to search for
beg - pointer to the first character in an array of characters to search
end - one past the end pointer for the array of characters to search

Return value

Pointer to the first character in [beg, end) that satisfies the mask, or end if no such character was found.

Example

// Run this code

  #include <locale>
  #include <clocale>
  #include <iostream>
  #include <iterator>

  int main()
  {
      std::setlocale(LC_ALL, "en_US.utf8");
      std::wcout.imbue(std::locale("en_US.utf8"));
      auto& f = std::use_facet<std::ctype<wchar_t>>(std::wcout.getloc());

      // skip until the first letter
      wchar_t s1[] = L" \t\t\n Кошка";
      const wchar_t* p1 = f.scan_is(std::ctype_base::alpha, std::begin(s1), std::end(s1));
      std::wcout << "'" << p1 << "'\n";

      // skip until the first letter
      wchar_t s2[] = L"123456789ネプネプ";
      const wchar_t* p2 = f.scan_is(std::ctype_base::alpha, std::begin(s2), std::end(s2));
      std::wcout << "'" << p2 << "'\n";
  }

Output:

  'Кошка'
  'ネプネプ'