整理

include/boost/date_time/posix_time/time_serialize.hpp

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+#ifndef POSIX_TIME_SERIALIZE_HPP___
+#define POSIX_TIME_SERIALIZE_HPP___
+
+/* Copyright (c) 2004-2005 CrystalClear Software, Inc.
+ * Use, modification and distribution is subject to the 
+ * Boost Software License, Version 1.0. (See accompanying
+ * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+ * Author: Jeff Garland, Bart Garst
+ * $Date$
+ */
+
+#include "boost/date_time/posix_time/posix_time.hpp"
+#include "boost/date_time/gregorian/greg_serialize.hpp"
+#include "boost/core/nvp.hpp"
+#include "boost/numeric/conversion/cast.hpp"
+#include "boost/type_traits/integral_constant.hpp"
+
+// Define versions for serialization compatibility
+// alows the unit tests to make an older version to check compatibility
+#ifndef BOOST_DATE_TIME_POSIX_TIME_DURATION_VERSION
+#define BOOST_DATE_TIME_POSIX_TIME_DURATION_VERSION 1
+#endif
+
+namespace boost {
+namespace serialization {
+
+template<typename T>
+struct version;
+
+template<>
+struct version<boost::posix_time::time_duration>
+  : integral_constant<int, BOOST_DATE_TIME_POSIX_TIME_DURATION_VERSION>
+{
+};
+
+// A macro to split serialize functions into save & load functions.
+// It is here to avoid dependency on Boost.Serialization just for the
+// BOOST_SERIALIZATION_SPLIT_FREE macro
+#define BOOST_DATE_TIME_SPLIT_FREE(T)                                         \
+template<class Archive>                                                       \
+inline void serialize(Archive & ar,                                           \
+                      T & t,                                                  \
+                      const unsigned int file_version)                        \
+{                                                                             \
+  split_free(ar, t, file_version);                                            \
+}
+
+BOOST_DATE_TIME_SPLIT_FREE(boost::posix_time::ptime)
+BOOST_DATE_TIME_SPLIT_FREE(boost::posix_time::time_duration)
+BOOST_DATE_TIME_SPLIT_FREE(boost::posix_time::time_period)
+
+#undef BOOST_DATE_TIME_SPLIT_FREE
+
+/*** time_duration ***/
+
+//! Function to save posix_time::time_duration objects using serialization lib
+/*! time_duration objects are broken down into 4 parts for serialization:
+ * types are hour_type, min_type, sec_type, and fractional_seconds_type
+ * as defined in the time_duration class
+ */
+template<class TimeResTraitsSize, class Archive>
+void save_td(Archive& ar, const posix_time::time_duration& td)
+{
+    TimeResTraitsSize h = boost::numeric_cast<TimeResTraitsSize>(td.hours());
+    TimeResTraitsSize m = boost::numeric_cast<TimeResTraitsSize>(td.minutes());
+    TimeResTraitsSize s = boost::numeric_cast<TimeResTraitsSize>(td.seconds());
+    posix_time::time_duration::fractional_seconds_type fs = td.fractional_seconds();
+    ar & make_nvp("time_duration_hours", h);
+    ar & make_nvp("time_duration_minutes", m);
+    ar & make_nvp("time_duration_seconds", s);
+    ar & make_nvp("time_duration_fractional_seconds", fs);
+}
+
+template<class Archive>
+void save(Archive & ar, 
+          const posix_time::time_duration& td, 
+          unsigned int version)
+{
+  // serialize a bool so we know how to read this back in later
+  bool is_special = td.is_special();
+  ar & make_nvp("is_special", is_special);
+  if(is_special) {
+    std::string s = to_simple_string(td);
+    ar & make_nvp("sv_time_duration", s);
+  }
+  else {
+    // Write support for earlier versions allows for upgrade compatibility testing
+    // See load comments for version information
+    if (version == 0) {
+        save_td<int32_t>(ar, td);
+    } else {
+        save_td<int64_t>(ar, td);
+    }
+  }
+}
+
+//! Function to load posix_time::time_duration objects using serialization lib
+/*! time_duration objects are broken down into 4 parts for serialization:
+ * types are hour_type, min_type, sec_type, and fractional_seconds_type
+ * as defined in the time_duration class
+ */
+template<class TimeResTraitsSize, class Archive>
+void load_td(Archive& ar, posix_time::time_duration& td)
+{
+    TimeResTraitsSize h(0);
+    TimeResTraitsSize m(0);
+    TimeResTraitsSize s(0);
+    posix_time::time_duration::fractional_seconds_type fs(0);
+    ar & make_nvp("time_duration_hours", h);
+    ar & make_nvp("time_duration_minutes", m);
+    ar & make_nvp("time_duration_seconds", s);
+    ar & make_nvp("time_duration_fractional_seconds", fs);
+    td = posix_time::time_duration(h, m, s, fs);
+}
+
+template<class Archive>
+void load(Archive & ar, 
+          posix_time::time_duration & td, 
+          unsigned int version)
+{
+  bool is_special = false;
+  ar & make_nvp("is_special", is_special);
+  if(is_special) {
+    std::string s;
+    ar & make_nvp("sv_time_duration", s);
+    posix_time::special_values sv = gregorian::special_value_from_string(s);
+    td = posix_time::time_duration(sv);
+  }
+  else {
+    // Version "0"   (Boost 1.65.1 or earlier, which used int32_t for day/hour/minute/second and
+    //                therefore suffered from the year 2038 issue.)
+    // Version "0.5" (Boost 1.66.0 changed to std::time_t but did not increase the version;
+    //                it was missed in the original change, all code reviews, and there were no
+    //                static assertions to protect the code; further std::time_t can be 32-bit
+    //                or 64-bit so it reduced portability.  This makes 1.66.0 hard to handle...)
+    // Version "1"   (Boost 1.67.0 or later uses int64_t and is properly versioned)
+
+    // If the size of any of these items changes, a new version is needed.
+    BOOST_STATIC_ASSERT(sizeof(posix_time::time_duration::hour_type) == sizeof(boost::int64_t));
+    BOOST_STATIC_ASSERT(sizeof(posix_time::time_duration::min_type) == sizeof(boost::int64_t));
+    BOOST_STATIC_ASSERT(sizeof(posix_time::time_duration::sec_type) == sizeof(boost::int64_t));
+    BOOST_STATIC_ASSERT(sizeof(posix_time::time_duration::fractional_seconds_type) == sizeof(boost::int64_t));
+
+    if (version == 0) {
+        load_td<int32_t>(ar, td);
+    } else {
+        load_td<int64_t>(ar, td);
+    }
+  }
+}
+
+// no load_construct_data function provided as time_duration provides a
+// default constructor
+
+/*** ptime ***/
+
+//! Function to save posix_time::ptime objects using serialization lib
+/*! ptime objects are broken down into 2 parts for serialization:
+ * a date object and a time_duration onject
+ */
+template<class Archive>
+void save(Archive & ar, 
+          const posix_time::ptime& pt, 
+          unsigned int /*version*/)
+{
+  // from_iso_string does not include fractional seconds
+  // therefore date and time_duration are used
+  posix_time::ptime::date_type d = pt.date();
+  ar & make_nvp("ptime_date", d);
+  if(!pt.is_special()) {
+    posix_time::ptime::time_duration_type td = pt.time_of_day();
+    ar & make_nvp("ptime_time_duration", td);
+  }
+}
+
+//! Function to load posix_time::ptime objects using serialization lib
+/*! ptime objects are broken down into 2 parts for serialization:
+ * a date object and a time_duration onject
+ */
+template<class Archive>
+void load(Archive & ar, 
+          posix_time::ptime & pt, 
+          unsigned int /*version*/)
+{
+  // from_iso_string does not include fractional seconds
+  // therefore date and time_duration are used
+  posix_time::ptime::date_type d(posix_time::not_a_date_time);
+  posix_time::ptime::time_duration_type td;
+  ar & make_nvp("ptime_date", d);
+  if(!d.is_special()) {
+    ar & make_nvp("ptime_time_duration", td);
+    pt = boost::posix_time::ptime(d,td);
+  }
+  else {
+    pt = boost::posix_time::ptime(d.as_special());
+  }
+    
+}
+
+//!override needed b/c no default constructor
+template<class Archive>
+inline void load_construct_data(Archive & /*ar*/, 
+                                posix_time::ptime* pt, 
+                                const unsigned int /*file_version*/)
+{
+  // retrieve data from archive required to construct new 
+  // invoke inplace constructor to initialize instance of date
+  new(pt) boost::posix_time::ptime(boost::posix_time::not_a_date_time);
+}
+
+/*** time_period ***/
+
+//! Function to save posix_time::time_period objects using serialization lib
+/*! time_period objects are broken down into 2 parts for serialization:
+ * a begining ptime object and an ending ptime object
+ */
+template<class Archive>
+void save(Archive & ar, 
+          const posix_time::time_period& tp, 
+          unsigned int /*version*/)
+{
+  posix_time::ptime beg(tp.begin().date(), tp.begin().time_of_day());
+  posix_time::ptime end(tp.end().date(), tp.end().time_of_day());
+  ar & make_nvp("time_period_begin", beg);
+  ar & make_nvp("time_period_end", end);
+}
+
+//! Function to load posix_time::time_period objects using serialization lib
+/*! time_period objects are broken down into 2 parts for serialization:
+ * a begining ptime object and an ending ptime object
+ */
+template<class Archive>
+void load(Archive & ar, 
+          boost::posix_time::time_period & tp, 
+          unsigned int /*version*/)
+{
+  posix_time::time_duration td(1,0,0);
+  gregorian::date d(gregorian::not_a_date_time);
+  posix_time::ptime beg(d,td);
+  posix_time::ptime end(d,td);
+  ar & make_nvp("time_period_begin", beg);
+  ar & make_nvp("time_period_end", end);
+  tp = boost::posix_time::time_period(beg, end);
+}
+
+//!override needed b/c no default constructor
+template<class Archive>
+inline void load_construct_data(Archive & /*ar*/, 
+                                boost::posix_time::time_period* tp, 
+                                const unsigned int /*file_version*/)
+{
+  posix_time::time_duration td(1,0,0);
+  gregorian::date d(gregorian::not_a_date_time);
+  posix_time::ptime beg(d,td);
+  posix_time::ptime end(d,td);
+  new(tp) boost::posix_time::time_period(beg,end);
+}
+
+} // namespace serialization
+} // namespace boost
+
+#endif