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78 lines
2.6 KiB
78 lines
2.6 KiB
#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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