Chris@16: #ifndef BOOST_SERIALIZATION_PFTO_HPP
Chris@16: #define BOOST_SERIALIZATION_PFTO_HPP
Chris@16: 
Chris@16: // MS compatible compilers support #pragma once
Chris@101: #if defined(_MSC_VER)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
Chris@16: // pfto.hpp: workarounds for compilers which have problems supporting
Chris@16: // Partial Function Template Ordering (PFTO).
Chris@16: 
Chris@16: // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
Chris@16: // Use, modification and distribution is subject to the Boost Software
Chris@16: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: //  See http://www.boost.org/libs/serialization for updates, documentation, and revision history.
Chris@16: // PFTO version is used to specify the last argument of certain functions
Chris@16: // Function it is used to support  compilers that fail to support correct Partial 
Chris@16: // Template Ordering
Chris@16: #include <boost/config.hpp>
Chris@16: 
Chris@16: // some compilers can use an exta argument and use function overloading
Chris@16: // to choose desired function.  This extra argument is long in the default
Chris@16: // function implementation and int for the rest.  The function is called
Chris@16: // with an int argument.  This first attempts to match functions with an
Chris@16: // int argument before the default one (with a long argument).  This is
Chris@16: // known to function with VC 6.0. On other compilers this fails (Borland)
Chris@16: // or causes other problems (GCC).  note: this 
Chris@16: 
Chris@16: #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
Chris@16:     #define BOOST_PFTO long
Chris@16: #else
Chris@16:     #define BOOST_PFTO
Chris@16: #endif
Chris@16: 
Chris@16: // here's another approach.  Rather than use a default function - make sure
Chris@16: // there is no default at all by requiring that all function invocations
Chris@16: // have a "wrapped" argument type.  This solves a problem with VC 6.0
Chris@16: // (and perhaps others) while implementing templated constructors.
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace serialization {
Chris@16: 
Chris@16: template<class T>
Chris@16: struct pfto_wrapper {
Chris@16:     const T & t;
Chris@16:     operator const T & (){
Chris@16:         return t;
Chris@16:     }
Chris@16:     pfto_wrapper (const T & rhs) : t(rhs) {}
Chris@16: };
Chris@16: 
Chris@16: template<class T>
Chris@16: pfto_wrapper< T > make_pfto_wrapper(const T & t, BOOST_PFTO int){
Chris@16:     return pfto_wrapper< T >(t);
Chris@16: }
Chris@16: 
Chris@16: template<class T>
Chris@16: pfto_wrapper< T > make_pfto_wrapper(const pfto_wrapper< T > & t, int){
Chris@16:     return t;
Chris@16: }
Chris@16: 
Chris@16: } // namespace serialization
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #ifdef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
Chris@16:     #define BOOST_PFTO_WRAPPER(T) \
Chris@16:         boost::serialization::pfto_wrapper< T >
Chris@16:     #define BOOST_MAKE_PFTO_WRAPPER(t) \
Chris@16:         boost::serialization::make_pfto_wrapper(t, 0)
Chris@16: #else
Chris@16:     #define BOOST_PFTO_WRAPPER(T) T
Chris@16:     #define BOOST_MAKE_PFTO_WRAPPER(t) t
Chris@16: #endif
Chris@16: 
Chris@16: #endif // BOOST_SERIALIZATION_PFTO_HPP