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Siegfried Heintze
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 Posted: Sat Feb 11, 2006 12:06 pm Post subject: How to read/write date times? |
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The following pair of functions work, except when I read the date/time
previously written by operator<<, it gets the year wrong. Perhaps it is
expecting a four digit year when it reads.
How can I modify my code below to expect a two digit year? How can I control
the format operator>> expects to find?
Thanks,
Siegfried
template <typename T> inline
std::basic_ostream<T>& operator<<(std::basic_ostream<T>& os, tm const&
tmbuf)
{
typename std::basic_ostream<T>::sentry cerberus(os);
if (!bool(cerberus)) return os;
const char fmt[] = "%x %X";
std::time_put<T> const& timeFacet = std::use_facet< std::time_put<T>
| Quote: | ( os.getloc() );
if (timeFacet.put(os, os, os.fill(), |
&tmbuf,fmt,fmt+sizeof(fmt)-1).failed())
//if (timeFacet.put(os, os, os.fill(), &tmbuf,'x').failed())
os.setstate(os.badbit);
return os;
}
template <typename T> inline
std::basic_istream<T>& operator>>(std::basic_istream<T>& s,struct std::tm&
t)
{
using namespace std;
typename std::basic_istream<T>::sentry cerberos(s);
if(cerberos) {
ios_base::iostate err = ios::goodbit;
const time_get<T>& tg=use_facet< time_get<T> >(s.getloc());
typedef istreambuf_iterator<T> ist;
ist from(s),end;
ist last=tg.get_date(from,end,s,err,&t);
++from;
tg.get_time(from,end,s,err,&t);
s.setstate(err);
}
return s;
}
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Carl Barron
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| Posted: Sat Feb 11, 2006 6:06 pm Post subject: Re: How to read/write date times? |
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In article <43ed6ac7$1@mamba.>, Siegfried Heintze
<siegfried (AT) heintze (DOT) com> wrote:
| Quote: | The following pair of functions work, except when I read the date/time
previously written by operator<<, it gets the year wrong. Perhaps it is
expecting a four digit year when it reads.
How can I modify my code below to expect a two digit year? How can I control
the format operator>> expects to find?
[snip]
typedef istreambuf_iterator<T> ist;
ist from(s),end;
ist last=tg.get_date(from,end,s,err,&t);
++from;
tg.get_time(from,end,s,err,&t);
s.setstate(err);
}
return s;
}
perhaps it should be tg.get_time(last,end,s,err,&t); |
not
++from ;
tg.get_time(from,end,...);
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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