|
sl@0
|
1 |
#ifndef BOOST_PFTO_HPP
|
|
sl@0
|
2 |
#define BOOST_PFTO_HPP
|
|
sl@0
|
3 |
|
|
sl@0
|
4 |
// MS compatible compilers support #pragma once
|
|
sl@0
|
5 |
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
|
sl@0
|
6 |
# pragma once
|
|
sl@0
|
7 |
#endif
|
|
sl@0
|
8 |
|
|
sl@0
|
9 |
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
|
|
sl@0
|
10 |
// pfto.hpp: workarounds for compilers which have problems supporting
|
|
sl@0
|
11 |
// Partial Function Template Ordering (PFTO).
|
|
sl@0
|
12 |
|
|
sl@0
|
13 |
// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
|
|
sl@0
|
14 |
// Use, modification and distribution is subject to the Boost Software
|
|
sl@0
|
15 |
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
|
sl@0
|
16 |
// http://www.boost.org/LICENSE_1_0.txt)
|
|
sl@0
|
17 |
|
|
sl@0
|
18 |
// See http://www.boost.org for updates, documentation, and revision history.
|
|
sl@0
|
19 |
// PFTO version is used to specify the last argument of certain functions
|
|
sl@0
|
20 |
// Function it is used to support compilers that fail to support correct Partial
|
|
sl@0
|
21 |
// Template Ordering
|
|
sl@0
|
22 |
#include <boost/config.hpp>
|
|
sl@0
|
23 |
|
|
sl@0
|
24 |
// some compilers can use an exta argument and use function overloading
|
|
sl@0
|
25 |
// to choose desired function. This extra argument is long in the default
|
|
sl@0
|
26 |
// function implementation and int for the rest. The function is called
|
|
sl@0
|
27 |
// with an int argument. This first attempts to match functions with an
|
|
sl@0
|
28 |
// int argument before the default one (with a long argument). This is
|
|
sl@0
|
29 |
// known to function with VC 6.0. On other compilers this fails (Borland)
|
|
sl@0
|
30 |
// or causes other problems (GCC). note: this
|
|
sl@0
|
31 |
|
|
sl@0
|
32 |
#if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING)
|
|
sl@0
|
33 |
#define BOOST_PFTO long
|
|
sl@0
|
34 |
#else
|
|
sl@0
|
35 |
#define BOOST_PFTO
|
|
sl@0
|
36 |
#endif
|
|
sl@0
|
37 |
|
|
sl@0
|
38 |
// here's another approach. Rather than use a default function - make sure
|
|
sl@0
|
39 |
// there is no default at all by requiring that all function invocations
|
|
sl@0
|
40 |
// have a "wrapped" argument type. This solves a problem with VC 6.0
|
|
sl@0
|
41 |
// (and perhaps others) while implementing templated constructors.
|
|
sl@0
|
42 |
|
|
sl@0
|
43 |
namespace boost {
|
|
sl@0
|
44 |
|
|
sl@0
|
45 |
template<class T>
|
|
sl@0
|
46 |
struct pfto_wrapper {
|
|
sl@0
|
47 |
const T & t;
|
|
sl@0
|
48 |
operator const T & (){
|
|
sl@0
|
49 |
return t;
|
|
sl@0
|
50 |
}
|
|
sl@0
|
51 |
pfto_wrapper (const T & rhs) : t(rhs) {}
|
|
sl@0
|
52 |
};
|
|
sl@0
|
53 |
|
|
sl@0
|
54 |
template<class T>
|
|
sl@0
|
55 |
pfto_wrapper<T> make_pfto_wrapper(const T & t, BOOST_PFTO int){
|
|
sl@0
|
56 |
return pfto_wrapper<T>(t);
|
|
sl@0
|
57 |
}
|
|
sl@0
|
58 |
|
|
sl@0
|
59 |
template<class T>
|
|
sl@0
|
60 |
pfto_wrapper<T> make_pfto_wrapper(const pfto_wrapper<T> & t, int){
|
|
sl@0
|
61 |
return t;
|
|
sl@0
|
62 |
}
|
|
sl@0
|
63 |
|
|
sl@0
|
64 |
} // namespace boost
|
|
sl@0
|
65 |
|
|
sl@0
|
66 |
#ifdef BOOST_NO_FUNCTION_TEMPLATE_ORDERING
|
|
sl@0
|
67 |
#define BOOST_PFTO_WRAPPER(T) boost::pfto_wrapper<T>
|
|
sl@0
|
68 |
#define BOOST_MAKE_PFTO_WRAPPER(t) boost::make_pfto_wrapper(t, 0)
|
|
sl@0
|
69 |
#else
|
|
sl@0
|
70 |
#define BOOST_PFTO_WRAPPER(T) T
|
|
sl@0
|
71 |
#define BOOST_MAKE_PFTO_WRAPPER(t) t
|
|
sl@0
|
72 |
#endif
|
|
sl@0
|
73 |
|
|
sl@0
|
74 |
#endif // BOOST_PFTO_HPP
|