Author: sebor
Date: Sun Sep 10 15:33:45 2006
New Revision: 442019
URL: http://svn.apache.org/viewvc?view=rev&rev=442019
Log:
2006-09-10 Martin Sebor <[EMAIL PROTECTED]>
* time_manip.cpp (time_get_manip. time_put_manip): Rewrote
operator() to demonstrate necessary exception handling.
Modified:
incubator/stdcxx/trunk/examples/manual/time_manip.cpp
Modified: incubator/stdcxx/trunk/examples/manual/time_manip.cpp
URL:
http://svn.apache.org/viewvc/incubator/stdcxx/trunk/examples/manual/time_manip.cpp?view=diff&rev=442019&r1=442018&r2=442019
==============================================================================
--- incubator/stdcxx/trunk/examples/manual/time_manip.cpp (original)
+++ incubator/stdcxx/trunk/examples/manual/time_manip.cpp Sun Sep 10 15:33:45
2006
@@ -44,25 +44,56 @@
: tmb_ (tmb) { }
template <class Traits>
- void
- operator() (std::basic_ios<charT, Traits> &strm, const charT *fmt) const {
- typedef std::istreambuf_iterator<charT> Iter;
- typedef std::time_get<charT, Iter> TimeGet;
+ void operator() (std::basic_istream<charT, Traits>&, const charT*) const;
+};
+
+
+template <class charT>
+template <class Traits>
+void time_get_manip<charT>::
+operator()(std::basic_istream<charT, Traits> &strm, const charT *fmt) const
+{
+ // begin by constructing a sentry object for the stream
+ const typename std::basic_istream<charT, Traits>::sentry guard (strm);
+
+ if (guard) {
// compute the end pointer of the format specifier
- const charT* const fmtend = fmt + Traits::length (fmt);
+ const charT* const end = fmt + Traits::length (fmt);
+
+ std::ios_base::iostate err = strm.goodbit;
+
+ typedef std::istreambuf_iterator<charT> Iter;
+ typedef std::time_get<charT, Iter> TimeGet;
- std::ios_base::iostate err = std::ios_base::goodbit;
- const TimeGet &tg = std::use_facet<TimeGet>(strm.getloc ());
+ try {
+ const TimeGet &tg = std::use_facet<TimeGet>(strm.getloc ());
- // extract the time from the stream using an extension
- // of this implementation
- tg.get (Iter (strm.rdbuf ()), Iter (), strm, err, tmb_, fmt, fmtend);
+ // try to extract the time from the stream using
+ // an extension of this implementation
+ tg.get (Iter (strm.rdbuf ()), Iter (), strm, err, tmb_, fmt, end);
+ }
+ catch (...) {
+ bool rethrow = false;
+
+ try {
+ // set badbit in exceptions without causing
+ // ios_base::failure to be thrown
+ strm.setstate (strm.badbit);
+ }
+ catch (...) {
+ // set a flag to rethrow the originally caught exception
+ rethrow = true;
+ }
+
+ if (rethrow)
+ throw;
+ }
- if (std::ios_base::goodbit != err)
+ if (strm.goodbit != err)
strm.setstate (err);
}
-};
+}
// implementation class of the insertion manipulator of std::tm values
@@ -75,22 +106,57 @@
: tmb_ (tmb) { }
template <class Traits>
- void
- operator() (std::basic_ios<charT, Traits> &strm, const charT *fmt) const {
+ void operator() (std::basic_ostream<charT, Traits>&, const charT*) const;
+};
+
+
+template <class charT>
+template <class Traits>
+void time_put_manip<charT>::
+operator() (std::basic_ostream<charT, Traits> &strm, const charT *fmt) const
+{
+ // begin by constructing a sentry object for the stream
+ const typename std::basic_ostream<charT, Traits>::sentry guard (strm);
+
+ if (guard) {
+
+ // compute the end pointer of the format specifier
+ const charT* const end = fmt + Traits::length (fmt);
+
typedef std::ostreambuf_iterator<charT> Iter;
typedef std::time_put<charT, Iter> TimePut;
- // compute the end pointer of the format specifier
- const charT* const fmtend = fmt + Traits::length (fmt);
+ Iter it (strm.rdbuf ());
- const TimePut &tp = std::use_facet<TimePut>(strm.getloc ());
- const Iter end = tp.put (Iter (strm.rdbuf ()), strm, strm.fill (),
- tmb_, fmt, fmtend);
+ try {
+ const TimePut &tp = std::use_facet<TimePut>(strm.getloc ());
- if (end.failed ())
- strm.setstate (std::ios_base::badbit);
+ // try to format and insert the time object into the stream
+ it = tp.put (it, strm, strm.fill (), tmb_, fmt, end);
+ }
+ catch (...) {
+ bool rethrow = false;
+
+ try {
+ // set badbit in exceptions without causing
+ // ios_base::failure to be thrown
+ strm.setstate (strm.badbit);
+ }
+ catch (...) {
+ // set a flag to rethrow the originally caught exception
+ rethrow = true;
+ }
+
+ if (rethrow)
+ throw;
+ }
+
+ // set badbit on failure to insert (which may cause
+ // ios_base::failure to be thrown)
+ if (it.failed ())
+ strm.setstate (strm.badbit);
}
-};
+}
// manipulator for the extraction of std::tm values
