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Set failbit instead of throw within to_stream

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* This is for consistency with other std streaming operations.
This commit is contained in:
Howard Hinnant
2017-06-12 21:01:58 -04:00
parent aa4dafcc46
commit ec412a1de0
1 changed files with 43 additions and 17 deletions
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60
date.h
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@ -4213,18 +4213,26 @@ struct fields
namespace detail
{
template <class Duration>
template <class CharT, class Traits, class Duration>
unsigned
extract_weekday(const fields<Duration>& fds)
extract_weekday(std::basic_ostream<CharT, Traits>& os, const fields<Duration>& fds)
{
if (!fds.ymd.ok() && !fds.wd.ok())
throw std::runtime_error("Can not format %u with unknown weekday");
{
// fds does not contain a valid weekday
os.setstate(std::ios::failbit);
return 7;
}
unsigned wd;
if (fds.ymd.ok())
{
wd = static_cast<unsigned>(weekday{fds.ymd});
if (fds.wd.ok() && wd != static_cast<unsigned>(fds.wd))
throw std::runtime_error("Can not format %u with inconsistent weekday");
{
// fds.ymd and fds.wd are inconsistent
os.setstate(std::ios::failbit);
return 7;
}
}
else
wd = static_cast<unsigned>(fds.wd);
@ -4247,10 +4255,6 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
CharT modified = CharT{};
for (; *fmt; ++fmt)
{
if (!command && modified != CharT{})
throw std::logic_error("loop invariant broken: !command && modified");
else if (modified != CharT{} && modified != CharT{'E'} && modified != CharT{'O'})
throw std::logic_error(std::string("bad value for modified: ") + char(modified));
switch (*fmt)
{
case 'a':
@ -4259,7 +4263,9 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
{
if (modified == CharT{})
{
tm.tm_wday = static_cast<int>(detail::extract_weekday(fds));
tm.tm_wday = static_cast<int>(detail::extract_weekday(os, fds));
if (os.fail())
return;
const CharT f[] = {'%', *fmt};
facet.put(os, os, os.fill(), &tm, begin(f), end(f));
}
@ -4311,7 +4317,9 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
tm.tm_mday = static_cast<int>(static_cast<unsigned>(ymd.day()));
tm.tm_mon = static_cast<int>(static_cast<unsigned>(ymd.month()) - 1);
tm.tm_year = static_cast<int>(ymd.year()) - 1900;
tm.tm_wday = static_cast<int>(detail::extract_weekday(fds));
tm.tm_wday = static_cast<int>(detail::extract_weekday(os, fds));
if (os.fail())
return;
tm.tm_yday = static_cast<int>((ld - local_days(ymd.year()/1/1)).count());
CharT f[3] = {'%'};
auto fe = begin(f) + 1;
@ -4720,7 +4728,9 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
case 'u':
if (command)
{
auto wd = detail::extract_weekday(fds);
auto wd = detail::extract_weekday(os, fds);
if (os.fail())
return;
if (modified == CharT{'O'})
{
const CharT f[] = {'%', modified, *fmt};
@ -4751,7 +4761,9 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
{
const CharT f[] = {'%', modified, *fmt};
tm.tm_year = static_cast<int>(ymd.year()) - 1900;
tm.tm_wday = static_cast<int>(detail::extract_weekday(fds));
tm.tm_wday = static_cast<int>(detail::extract_weekday(os, fds));
if (os.fail())
return;
tm.tm_yday = static_cast<int>((ld - local_days(ymd.year()/1/1)).count());
facet.put(os, os, os.fill(), &tm, begin(f), end(f));
modified = CharT{};
@ -4788,7 +4800,9 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
const CharT f[] = {'%', modified, *fmt};
auto const& ymd = fds.ymd;
tm.tm_year = static_cast<int>(ymd.year()) - 1900;
tm.tm_wday = static_cast<int>(detail::extract_weekday(fds));
tm.tm_wday = static_cast<int>(detail::extract_weekday(os, fds));
if (os.fail())
return;
tm.tm_yday = static_cast<int>((ld - local_days(ymd.year()/1/1)).count());
facet.put(os, os, os.fill(), &tm, begin(f), end(f));
modified = CharT{};
@ -4820,7 +4834,9 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
case 'w':
if (command)
{
auto wd = detail::extract_weekday(fds);
auto wd = detail::extract_weekday(os, fds);
if (os.fail())
return;
if (modified == CharT{'O'})
{
const CharT f[] = {'%', modified, *fmt};
@ -4851,7 +4867,9 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
{
const CharT f[] = {'%', modified, *fmt};
tm.tm_year = static_cast<int>(ymd.year()) - 1900;
tm.tm_wday = static_cast<int>(detail::extract_weekday(fds));
tm.tm_wday = static_cast<int>(detail::extract_weekday(os, fds));
if (os.fail())
return;
tm.tm_yday = static_cast<int>((ld - local_days(ymd.year()/1/1)).count());
facet.put(os, os, os.fill(), &tm, begin(f), end(f));
modified = CharT{};
@ -4955,7 +4973,11 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
if (command)
{
if (offset_sec == nullptr)
throw std::runtime_error("Can not format %z with unknown offset");
{
// Can not format %z with unknown offset
os.setstate(ios::failbit);
return;
}
auto m = duration_cast<minutes>(*offset_sec);
auto neg = m < minutes{0};
m = date::abs(m);
@ -4985,7 +5007,11 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
if (modified == CharT{})
{
if (abbrev == nullptr)
throw std::runtime_error("Can not format %Z with unknown time_zone");
{
// Can not format %Z with unknown time_zone
os.setstate(ios::failbit);
return;
}
for (auto c : *abbrev)
os << CharT(c);
}