_find
return _find (data (), c, pos, length ());
if (_find (s, data () [xpos], 0, n) != npos)
if (_find (s, data () [xpos], 0, n) != npos)
if (_find (s, data () [xpos], 0, n) == npos)
if (_find (s, data () [xpos], 0, n) == npos)
static size_type _find (const charT* ptr, charT c, size_type xpos, size_type len);