williamr@2
|
1 |
|
williamr@2
|
2 |
// (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
|
williamr@2
|
3 |
// Howard Hinnant and John Maddock 2000.
|
williamr@2
|
4 |
// (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
|
williamr@2
|
5 |
|
williamr@2
|
6 |
// Use, modification and distribution are subject to the Boost Software License,
|
williamr@2
|
7 |
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
williamr@2
|
8 |
// http://www.boost.org/LICENSE_1_0.txt).
|
williamr@2
|
9 |
//
|
williamr@2
|
10 |
// See http://www.boost.org/libs/type_traits for most recent version including documentation.
|
williamr@2
|
11 |
|
williamr@2
|
12 |
// Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
|
williamr@2
|
13 |
// is_member_pointer based on the Simulated Partial Specialization work
|
williamr@2
|
14 |
// of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or
|
williamr@2
|
15 |
// http://groups.yahoo.com/group/boost/message/5441
|
williamr@2
|
16 |
// Some workarounds in here use ideas suggested from "Generic<Programming>:
|
williamr@2
|
17 |
// Mappings between Types and Values"
|
williamr@2
|
18 |
// by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
|
williamr@2
|
19 |
|
williamr@2
|
20 |
|
williamr@2
|
21 |
#ifndef BOOST_TT_IS_SAME_HPP_INCLUDED
|
williamr@2
|
22 |
#define BOOST_TT_IS_SAME_HPP_INCLUDED
|
williamr@2
|
23 |
|
williamr@2
|
24 |
#include <boost/type_traits/config.hpp>
|
williamr@2
|
25 |
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
williamr@2
|
26 |
#include <boost/type_traits/detail/yes_no_type.hpp>
|
williamr@2
|
27 |
#include <boost/type_traits/detail/ice_and.hpp>
|
williamr@2
|
28 |
#include <boost/type_traits/is_reference.hpp>
|
williamr@2
|
29 |
#endif
|
williamr@2
|
30 |
// should be the last #include
|
williamr@2
|
31 |
#include <boost/type_traits/detail/bool_trait_def.hpp>
|
williamr@2
|
32 |
|
williamr@2
|
33 |
namespace boost {
|
williamr@2
|
34 |
|
williamr@2
|
35 |
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
williamr@2
|
36 |
|
williamr@2
|
37 |
BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,false)
|
williamr@2
|
38 |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T,T,true)
|
williamr@2
|
39 |
#if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
|
williamr@2
|
40 |
// without this, Borland's compiler gives the wrong answer for
|
williamr@2
|
41 |
// references to arrays:
|
williamr@2
|
42 |
BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC2_1(typename T,is_same,T&,T&,true)
|
williamr@2
|
43 |
#endif
|
williamr@2
|
44 |
|
williamr@2
|
45 |
#else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
williamr@2
|
46 |
|
williamr@2
|
47 |
namespace detail {
|
williamr@2
|
48 |
|
williamr@2
|
49 |
#ifdef BOOST_MSVC
|
williamr@2
|
50 |
// the following VC6 specific implementation is *NOT* legal
|
williamr@2
|
51 |
// C++, but has the advantage that it works for incomplete
|
williamr@2
|
52 |
// types.
|
williamr@2
|
53 |
|
williamr@2
|
54 |
template< typename T1 >
|
williamr@2
|
55 |
struct is_same_part_1
|
williamr@2
|
56 |
{
|
williamr@2
|
57 |
template<typename T2> struct part_2 { enum { value = false }; };
|
williamr@2
|
58 |
template<> struct part_2<T1> { enum { value = true }; };
|
williamr@2
|
59 |
};
|
williamr@2
|
60 |
|
williamr@2
|
61 |
template< typename T1, typename T2 >
|
williamr@2
|
62 |
struct is_same_impl
|
williamr@2
|
63 |
{
|
williamr@2
|
64 |
enum { value = detail::is_same_part_1<T1>::template part_2<T2>::value };
|
williamr@2
|
65 |
};
|
williamr@2
|
66 |
|
williamr@2
|
67 |
#else // generic "no-partial-specialization" version
|
williamr@2
|
68 |
|
williamr@2
|
69 |
template <typename T>
|
williamr@2
|
70 |
::boost::type_traits::yes_type
|
williamr@2
|
71 |
BOOST_TT_DECL is_same_tester(T*, T*);
|
williamr@2
|
72 |
|
williamr@2
|
73 |
::boost::type_traits::no_type
|
williamr@2
|
74 |
BOOST_TT_DECL is_same_tester(...);
|
williamr@2
|
75 |
|
williamr@2
|
76 |
template <typename T, typename U>
|
williamr@2
|
77 |
struct is_same_impl
|
williamr@2
|
78 |
{
|
williamr@2
|
79 |
static T t;
|
williamr@2
|
80 |
static U u;
|
williamr@2
|
81 |
|
williamr@2
|
82 |
BOOST_STATIC_CONSTANT(bool, value =
|
williamr@2
|
83 |
(::boost::type_traits::ice_and<
|
williamr@2
|
84 |
(sizeof(type_traits::yes_type) == sizeof(detail::is_same_tester(&t,&u))),
|
williamr@2
|
85 |
(::boost::is_reference<T>::value == ::boost::is_reference<U>::value),
|
williamr@2
|
86 |
(sizeof(T) == sizeof(U))
|
williamr@2
|
87 |
>::value));
|
williamr@2
|
88 |
};
|
williamr@2
|
89 |
|
williamr@2
|
90 |
#endif // BOOST_MSVC
|
williamr@2
|
91 |
|
williamr@2
|
92 |
} // namespace detail
|
williamr@2
|
93 |
|
williamr@2
|
94 |
BOOST_TT_AUX_BOOL_TRAIT_DEF2(is_same,T,U,(::boost::detail::is_same_impl<T,U>::value))
|
williamr@2
|
95 |
|
williamr@2
|
96 |
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
|
williamr@2
|
97 |
|
williamr@2
|
98 |
} // namespace boost
|
williamr@2
|
99 |
|
williamr@2
|
100 |
#include <boost/type_traits/detail/bool_trait_undef.hpp>
|
williamr@2
|
101 |
|
williamr@2
|
102 |
#endif // BOOST_TT_IS_SAME_HPP_INCLUDED
|
williamr@2
|
103 |
|