You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
#ifndef BOOST_PFTO_HPP
|
|
#define BOOST_PFTO_HPP
|
|
|
|
// MS compatible compilers support #pragma once
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
|
# 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 {
|
|
|
|
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 boost
|
|
|
|
#ifdef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
|
|
#define BOOST_PFTO_WRAPPER(T) boost::pfto_wrapper<T>
|
|
#define BOOST_MAKE_PFTO_WRAPPER(t) boost::make_pfto_wrapper(t, 0)
|
|
#else
|
|
#define BOOST_PFTO_WRAPPER(T) T
|
|
#define BOOST_MAKE_PFTO_WRAPPER(t) t
|
|
#endif
|
|
|
|
#endif // BOOST_PFTO_HPP
|