Author: sebor
Date: Wed Oct 12 13:21:09 2005
New Revision: 315025
URL: http://svn.apache.org/viewcvs?rev=315025&view=rev
Log:
2005-10-12 Martin Sebor <[EMAIL PROTECTED]>
* time_manip.cpp: New example program demonstrating the implementation
of user-defined manipulators (using the std::__rw_smanip template) for
the convenient extraction and insertion of std::tm values.
Added:
incubator/stdcxx/trunk/examples/manual/time_manip.cpp (with props)
Added: incubator/stdcxx/trunk/examples/manual/time_manip.cpp
URL:
http://svn.apache.org/viewcvs/incubator/stdcxx/trunk/examples/manual/time_manip.cpp?rev=315025&view=auto
==============================================================================
--- incubator/stdcxx/trunk/examples/manual/time_manip.cpp (added)
+++ incubator/stdcxx/trunk/examples/manual/time_manip.cpp Wed Oct 12 13:21:09
2005
@@ -0,0 +1,145 @@
+/**************************************************************************
+ *
+ * time_manip.cpp - Example program demonstrating the implementation
+ * of user-defined manipulators for the convenient
+ * extraction and insertion of std::tm values
+ *
+ * $Id$
+ *
+ ***************************************************************************
+ *
+ * Copyright (c) 1994-2005 Quovadx, Inc., acting through its Rogue Wave
+ * Software division. Licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0. Unless required by
+ * applicable law or agreed to in writing, software distributed under
+ * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, either express or implied. See the License
+ * for the specific language governing permissions and limitations under
+ * the License.
+ *
+ **************************************************************************/
+
+#include <ctime>
+#include <iomanip>
+#include <iostream>
+#include <locale>
+
+#include <examples.h>
+
+
+// implementation class of the extraction manipulator of std::tm values
+template <class charT>
+struct time_get_manip
+{
+ std::tm *tmb_;
+
+ time_get_manip (std::tm *tmb)
+ : 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;
+
+ // compute the end pointer of the format specifier
+ const charT* const fmtend = fmt + Traits::length (fmt);
+
+ std::ios_base::iostate err = std::ios_base::goodbit;
+ const TimeGet &tg = std::use_facet<TimeGet>(strm.getloc ());
+
+ // extract the time from the stream using an extension
+ // of this implementation
+ const Iter end =
+ tg.get (Iter (strm.rdbuf ()), Iter (), strm, err, tmb_,
+ fmt, fmtend);
+
+ strm.setstate (err);
+ }
+};
+
+
+// implementation class of the insertion manipulator of std::tm values
+template <class charT>
+struct time_put_manip
+{
+ const std::tm *tmb_;
+
+ time_put_manip (const std::tm *tmb)
+ : tmb_ (tmb) { }
+
+ template <class Traits>
+ void
+ operator() (std::basic_ios<charT, Traits> &strm, const charT *fmt) const {
+ 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);
+
+ const TimePut &tp = std::use_facet<TimePut>(strm.getloc ());
+ const Iter end =
+ tp.put (Iter (strm.rdbuf ()), strm, strm.fill (), tmb_,
+ fmt, fmtend);
+
+ if (end.failed ())
+ strm.setstate (std::ios_base::badbit);
+ }
+};
+
+
+// manipulator for the extraction of std::tm values
+template <class charT>
+inline std::__rw_smanip<time_get_manip<charT>, const charT*>
+get_time (std::tm *tmb, const charT *fmt)
+{
+ // return an object of the manipulator implementation type
+ // which will store the function arguments until its function
+ // call operator is invoked by the extraction operator for
+ // std::__rw_smanip
+ return std::__rw_smanip<time_get_manip<charT>, const charT*>(tmb, fmt);
+}
+
+
+// manipulator for the insertion of std::tm values
+inline std::__rw_smanip<time_put_manip<charT>, const charT*>
+put_time (const std::tm *tmb, const charT *fmt)
+{
+ // return an object of the manipulator implementation type
+ // which will store the function arguments until its function
+ // call operator is invoked by the insertion operator for
+ // std::__rw_smanip
+ return std::__rw_smanip<time_put_manip<charT>, const charT*>(tmb, fmt);
+}
+
+
+int main (int argc, char *argv[])
+{
+ // the first optional command line argument specifies
+ // the extration format specifier string
+ const char* const get_fmt = argc < 2 ? "%c" : argv [1];
+
+ // the seconf optional command line argument specifies
+ // the insertion format specifier string
+ const char* const put_fmt = argc < 3 ? "%c" : argv [2];
+
+ // obtain the local time
+ const std::time_t t = time (0);
+ std::tm* const tmb = std::localtime (&t);
+
+ // set cout's locale to the one specified in the environment
+ std::cout.imbue (std::locale (""));
+
+ // output the local time using the specified format
+ std::cout << put_time (tmb, put_fmt) << '\n';
+
+ // input time in the specified input format using the "C" locale
+ std::cin >> get_time (tmb, get_fmt);
+
+ // output the extracted time using the output format
+ std::cout << put_time (tmb, put_fmt) << '\n';
+
+ return 0;
+}
Propchange: incubator/stdcxx/trunk/examples/manual/time_manip.cpp
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Propchange: incubator/stdcxx/trunk/examples/manual/time_manip.cpp
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