擴充boost serialization 支援 CString, CTime

boost的serialization是一個很強大的工具
原本的程式架構只支援std::string等STL元件
如果你的程式有需要用到MFC的話
MFC的CString, CTime或其他class可以很簡單的擴充到boost serialization

namespace boost
{
 namespace serialization
 {
  template
  inline void save(Archive & ar, const CString& str, const unsigned int file_version)
  {
   std::wstring wstr(str);
   ar & BOOST_SERIALIZATION_NVP(wstr);
  }

  template
  inline void load(Archive &ar, CString& str, const unsigned int file_version)
  {
   std::wstring wstr;
   ar & BOOST_SERIALIZATION_NVP(wstr);
   str = wstr.data();
  }

  template
  inline void serialize(Archive &ar, CString &str, const unsigned int file_version)
  {
   boost::serialization::split_free(ar, str, file_version);
  }

  template
  inline void save(Archive & ar, const CTime& time, const unsigned int file_version)
  {
   __time64_t t = time.GetTime();
   ar & t;
  }

  template
  inline void load(Archive &ar, CTime& time, const unsigned int file_version)
  {
   __time64_t t;
   ar & t;
   time = t;
  }

  template
  inline void serialize(Archive &ar, CTime &time, const unsigned int file_version)
  {
   boost::serialization::split_free(ar, time, file_version);
  }
 }
}

ps. 要注意一點，擴充的class要放在boost::serialization namespace裡，要不然可能會找不到對映的function

Reference
http://www.boost.org/doc/libs/1_37_0/libs/serialization/doc/index.html