diff options
Diffstat (limited to 'libstdc++-v3/include/bits/regex.tcc')
| -rw-r--r-- | libstdc++-v3/include/bits/regex.tcc | 49 |
1 files changed, 41 insertions, 8 deletions
diff --git a/libstdc++-v3/include/bits/regex.tcc b/libstdc++-v3/include/bits/regex.tcc index b94fe44..48917cd 100644 --- a/libstdc++-v3/include/bits/regex.tcc +++ b/libstdc++-v3/include/bits/regex.tcc @@ -331,20 +331,53 @@ namespace __detail && __c == __fctyp.widen('_')); } +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wc++17-extensions" // if constexpr template<typename _Ch_type> int regex_traits<_Ch_type>:: value(_Ch_type __ch, int __radix) const { - std::basic_istringstream<char_type> __is(string_type(1, __ch)); - long __v; - if (__radix == 8) - __is >> std::oct; - else if (__radix == 16) - __is >> std::hex; - __is >> __v; - return __is.fail() ? -1 : __v; + if constexpr (sizeof(_Ch_type) > 1) + { + const auto& __ctyp = std::use_facet<ctype<_Ch_type>>(_M_locale); + const char __c = __ctyp.narrow(__ch, '\0'); + return regex_traits<char>{}.value(__c, __radix); + } + else + { + const char __c = static_cast<char>(__ch); + const char __max_digit = __radix == 8 ? '7' : '9'; + if ('0' <= __c && __c <= __max_digit) + return __c - '0'; + if (__radix < 16) + return -1; + switch (__c) + { + case 'a': + case 'A': + return 10; + case 'b': + case 'B': + return 11; + case 'c': + case 'C': + return 12; + case 'd': + case 'D': + return 13; + case 'e': + case 'E': + return 14; + case 'f': + case 'F': + return 15; + default: + return -1; + } + } } +#pragma GCC diagnostic pop template<typename _Bi_iter, typename _Alloc> template<typename _Out_iter> |