79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
#ifndef BOOST_SERIALIZATION_PFTO_HPP
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#define BOOST_SERIALIZATION_PFTO_HPP
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
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// pfto.hpp: workarounds for compilers which have problems supporting
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// Partial Function Template Ordering (PFTO).
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
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// Use, modification and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/serialization for updates, documentation, and revision history.
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// PFTO version is used to specify the last argument of certain functions
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// Function it is used to support compilers that fail to support correct Partial
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// Template Ordering
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#include <boost/config.hpp>
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// some compilers can use an exta argument and use function overloading
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// to choose desired function. This extra argument is long in the default
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// function implementation and int for the rest. The function is called
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// with an int argument. This first attempts to match functions with an
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// int argument before the default one (with a long argument). This is
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// known to function with VC 6.0. On other compilers this fails (Borland)
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// or causes other problems (GCC). note: this
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#if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
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#define BOOST_PFTO long
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#else
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#define BOOST_PFTO
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#endif
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// here's another approach. Rather than use a default function - make sure
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// there is no default at all by requiring that all function invocations
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// have a "wrapped" argument type. This solves a problem with VC 6.0
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// (and perhaps others) while implementing templated constructors.
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namespace boost {
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namespace serialization {
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template<class T>
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struct pfto_wrapper {
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const T & t;
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operator const T & (){
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return t;
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}
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pfto_wrapper (const T & rhs) : t(rhs) {}
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};
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template<class T>
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pfto_wrapper< T > make_pfto_wrapper(const T & t, BOOST_PFTO int){
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return pfto_wrapper< T >(t);
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}
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template<class T>
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pfto_wrapper< T > make_pfto_wrapper(const pfto_wrapper< T > & t, int){
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return t;
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}
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} // namespace serialization
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} // namespace boost
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#ifdef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
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#define BOOST_PFTO_WRAPPER(T) \
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boost::serialization::pfto_wrapper< T >
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#define BOOST_MAKE_PFTO_WRAPPER(t) \
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boost::serialization::make_pfto_wrapper(t, 0)
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#else
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#define BOOST_PFTO_WRAPPER(T) T
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#define BOOST_MAKE_PFTO_WRAPPER(t) t
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#endif
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#endif // BOOST_SERIALIZATION_PFTO_HPP
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