boost/serialization/strong_typedef.hpp

   1 #ifndef BOOST_SERIALIZATION_STRONG_TYPEDEF_HPP
   2 #define BOOST_SERIALIZATION_STRONG_TYPEDEF_HPP
   3
   4 // MS compatible compilers support #pragma once
   5 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
   6 # pragma once
   7 #endif
   8
   9 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
  10 // strong_typedef.hpp:
  11
  12 // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
  13 // Use, modification and distribution is subject to the Boost Software
  14 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  15 // http://www.boost.org/LICENSE_1_0.txt)
  16
  17 //  See http://www.boost.org/libs/serialization for updates, documentation, and revision history.
  18
  19 // macro used to implement a strong typedef.  strong typedef
  20 // guarentees that two types are distinguised even though the
  21 // share the same underlying implementation.  typedef does not create
  22 // a new type.  BOOST_STRONG_TYPEDEF(T, D) creates a new type named D
  23 // that operates as a type T.
  24
  25 #include <boost/config.hpp>
  26 #include <boost/operators.hpp>
  27
  28 #if !defined(__BORLANDC__) || __BORLANDC__ >= 0x590
  29     #define BOOST_STRONG_TYPEDEF(T, D)                              \
  30     struct D                                                        \
  31         : boost::totally_ordered1< D                                \
  32         , boost::totally_ordered2< D, T                             \
  33         > >                                                         \
  34     {                                                               \
  35         T t;                                                        \
  36         explicit D(const T t_) : t(t_) {};                          \
  37         D(){};                                                      \
  38         D(const D & t_) : t(t_.t){}                                 \
  39         D & operator=(const D & rhs) { t = rhs.t; return *this;}    \
  40         D & operator=(const T & rhs) { t = rhs; return *this;}      \
  41         operator const T & () const {return t; }                    \
  42         operator T & () { return t; }                               \
  43         bool operator==(const D & rhs) const { return t == rhs.t; } \
  44         bool operator<(const D & rhs) const { return t < rhs.t; }   \
  45     };
  46 #else
  47     #define BOOST_STRONG_TYPEDEF(T, D)                              \
  48     struct D                                                        \
  49         : boost::totally_ordered1< D                                \
  50         , boost::totally_ordered2< D, T                             \
  51         > >                                                         \
  52     {                                                               \
  53         T t;                                                        \
  54         explicit D(const T t_) : t(t_) {};                          \
  55         D(){};                                                      \
  56         D(const D & t_) : t(t_.t){}                                 \
  57         D & operator=(const D & rhs) { t = rhs.t; return *this;}    \
  58         D & operator=(const T & rhs) { t = rhs; return *this;}      \
  59         /*operator const T & () const {return t; }*/                \
  60         operator T & () { return t; }                               \
  61         bool operator==(const D & rhs) const { return t == rhs.t; } \
  62         bool operator<(const D & rhs) const { return t < rhs.t; }   \
  63     };
  64 #endif // !defined(__BORLANDC) || __BORLANDC__ >= 0x590
  65
  66 #endif // BOOST_SERIALIZATION_STRONG_TYPEDEF_HPP