- _M_decimal_point = static_cast<wchar_t>(((union { const char *__s; unsigned int __w; }){ __s: __nl_langinfo_l(_NL_NUMERIC_DECIMAL_POINT_WC, __cloc)}).__w);
- _M_thousands_sep = static_cast<wchar_t>(((union { const char *__s; unsigned int __w; }){ __s: __nl_langinfo_l(_NL_NUMERIC_THOUSANDS_SEP_WC, __cloc)}).__w);
- if (_M_thousands_sep == L'\0')
- _M_grouping = "";
+ // NB: In the GNU model wchar_t is always 32 bit wide.
+ union { char *__s; wchar_t __w; } __u;
+ __u.__s = __nl_langinfo_l(_NL_NUMERIC_DECIMAL_POINT_WC, __cloc);
+ _M_data->_M_decimal_point = __u.__w;
+
+ __u.__s = __nl_langinfo_l(_NL_NUMERIC_THOUSANDS_SEP_WC, __cloc);
+ _M_data->_M_thousands_sep = __u.__w;
+
+ // Check for NULL, which implies no grouping.
+ if (_M_data->_M_thousands_sep == L'\0')
+ {
+ // Like in "C" locale.
+ _M_data->_M_grouping = "";
+ _M_data->_M_grouping_size = 0;
+ _M_data->_M_use_grouping = false;
+ _M_data->_M_thousands_sep = L',';
+ }