inline std::basic_istream<CharT,Traits>&
operator>>(std::basic_istream<CharT,Traits>& is, uuid& id)
{
typedef typename std::basic_istream<CharT,Traits>::sentry sentry_t;
sentry_t ok(is);
if (ok)
{
CharT c;
if (!is.get(c))
return is;
is.unget();
if (c == is.widen('{'))
{
CharT buf[38+1];
if (!is.read(buf, 38))
return is;
buf[38] = CharT();
id = uuid(buf);
}
else
{
CharT buf[36+1];
if (!is.read(buf, 36))
return is;
buf[36] = CharT();
id = uuid(buf);
}
}
return is;
}
template <class Output, class Ch, class Tr, class IsSpecial> inline
Output
in_quote(std::basic_istream<Ch, Tr> &i, Output out, IsSpecial is_special = IsSpecial(),
char quote_char='"', char escape_char='\\')
{
char c;
if (i.get(c)) {
*out++=c;
if (c==quote_char) { // quoted - end delimited by unescape quote
for (;;) {
if (!i.get(c))
goto fail;
if (c==quote_char)
break;
if (c==escape_char)
if (!i.get(c))
goto fail;
*out++=c;
}
} else { // unquoted - end delimited by an is_special char
while (i.get(c)) {
if (is_special(c)) {
i.unget();
break;
}
*out++=c;
}
}
} // else end of stream. shouldn't interpret as empty token but not throwing exception either. check status of i before you use.
return out;
fail:
throw std::runtime_error("end of file reached when parsing quoted string (in_quote)");
}
std::basic_istream<CharT,Traits>&
operator>>(std::basic_istream<CharT,Traits>& in, pcg128_t& value)
{
typename std::basic_istream<CharT,Traits>::sentry s(in);
if (!s)
return in;
constexpr auto BASE = pcg128_t(10ULL);
pcg128_t current(0ULL);
bool did_nothing = true;
bool overflow = false;
for(;;) {
CharT wide_ch = in.get();
if (!in.good())
break;
auto ch = in.narrow(wide_ch, '\0');
if (ch < '0' || ch > '9') {
in.unget();
break;
}
did_nothing = false;
pcg128_t digit(uint32_t(ch - '0'));
pcg128_t timesbase = current*BASE;
overflow = overflow || timesbase < current;
current = timesbase + digit;
overflow = overflow || current < digit;
}
if (did_nothing || overflow) {
in.setstate(std::ios::failbit);
if (overflow)
current = ~pcg128_t(0ULL);
}
value = current;
return in;
}
