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