1
2// (C) Copyright John Maddock 2005.
3// Use, modification and distribution are subject to the Boost Software License,
4// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
5// http://www.boost.org/LICENSE_1_0.txt).
6//
7// See http://www.boost.org/libs/type_traits for most recent version including documentation.
8
9
10#ifndef BOOST_TT_IS_SIGNED_HPP_INCLUDED
11#define BOOST_TT_IS_SIGNED_HPP_INCLUDED
12
13#include <boost/type_traits/is_integral.hpp>
14#include <boost/type_traits/remove_cv.hpp>
15#include <boost/type_traits/is_enum.hpp>
16#include <boost/type_traits/detail/ice_or.hpp>
17
18// should be the last #include
19#include <boost/type_traits/detail/bool_trait_def.hpp>
20
21namespace boost {
22
23#if !defined( __CODEGEARC__ )
24
25namespace detail{
26
27#if !(defined(__EDG_VERSION__) && __EDG_VERSION__ <= 238) && !defined(BOOST_NO_INCLASS_MEMBER_INITIALIZATION)
28
29template <class T>
30struct is_signed_values
31{
32 //
33 // Note that we cannot use BOOST_STATIC_CONSTANT here, using enum's
34 // rather than "real" static constants simply doesn't work or give
35 // the correct answer.
36 //
37 typedef typename remove_cv<T>::type no_cv_t;
38 static const no_cv_t minus_one = (static_cast<no_cv_t>(-1));
39 static const no_cv_t zero = (static_cast<no_cv_t>(0));
40};
41
42template <class T>
43struct is_signed_helper
44{
45 typedef typename remove_cv<T>::type no_cv_t;
46 BOOST_STATIC_CONSTANT(bool, value = (!(::boost::detail::is_signed_values<T>::minus_one > boost::detail::is_signed_values<T>::zero)));
47};
48
49template <bool integral_type>
50struct is_signed_select_helper
51{
52 template <class T>
53 struct rebind
54 {
55 typedef is_signed_helper<T> type;
56 };
57};
58
59template <>
60struct is_signed_select_helper<false>
61{
62 template <class T>
63 struct rebind
64 {
65 typedef false_type type;
66 };
67};
68
69template <class T>
70struct is_signed_imp
71{
72 typedef is_signed_select_helper<
73 ::boost::type_traits::ice_or<
74 ::boost::is_integral<T>::value,
75 ::boost::is_enum<T>::value>::value
76 > selector;
77 typedef typename selector::template rebind<T> binder;
78 typedef typename binder::type type;
79 BOOST_STATIC_CONSTANT(bool, value = type::value);
80};
81
82#else
83
84template <class T> struct is_signed_imp : public false_type{};
85template <> struct is_signed_imp<signed char> : public true_type{};
86template <> struct is_signed_imp<const signed char> : public true_type{};
87template <> struct is_signed_imp<volatile signed char> : public true_type{};
88template <> struct is_signed_imp<const volatile signed char> : public true_type{};
89template <> struct is_signed_imp<short> : public true_type{};
90template <> struct is_signed_imp<const short> : public true_type{};
91template <> struct is_signed_imp<volatile short> : public true_type{};
92template <> struct is_signed_imp<const volatile short> : public true_type{};
93template <> struct is_signed_imp<int> : public true_type{};
94template <> struct is_signed_imp<const int> : public true_type{};
95template <> struct is_signed_imp<volatile int> : public true_type{};
96template <> struct is_signed_imp<const volatile int> : public true_type{};
97template <> struct is_signed_imp<long> : public true_type{};
98template <> struct is_signed_imp<const long> : public true_type{};
99template <> struct is_signed_imp<volatile long> : public true_type{};
100template <> struct is_signed_imp<const volatile long> : public true_type{};
101#ifdef BOOST_HAS_LONG_LONG
102template <> struct is_signed_imp<long long> : public true_type{};
103template <> struct is_signed_imp<const long long> : public true_type{};
104template <> struct is_signed_imp<volatile long long> : public true_type{};
105template <> struct is_signed_imp<const volatile long long> : public true_type{};
106#endif
107#if defined(CHAR_MIN) && (CHAR_MIN != 0)
108template <> struct is_signed_imp<char> : public true_type{};
109template <> struct is_signed_imp<const char> : public true_type{};
110template <> struct is_signed_imp<volatile char> : public true_type{};
111template <> struct is_signed_imp<const volatile char> : public true_type{};
112#endif
113#if defined(WCHAR_MIN) && (WCHAR_MIN != 0)
114template <> struct is_signed_imp<wchar_t> : public true_type{};
115template <> struct is_signed_imp<const wchar_t> : public true_type{};
116template <> struct is_signed_imp<volatile wchar_t> : public true_type{};
117template <> struct is_signed_imp<const volatile wchar_t> : public true_type{};
118#endif
119
120#endif
121
122}
123
124#endif // !defined( __CODEGEARC__ )
125
126#if defined( __CODEGEARC__ )
127BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_signed,T,__is_signed(T))
128#else
129BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_signed,T,::boost::detail::is_signed_imp<T>::value)
130#endif
131
132} // namespace boost
133
134#include <boost/type_traits/detail/bool_trait_undef.hpp>
135
136#endif // BOOST_TT_IS_MEMBER_FUNCTION_POINTER_HPP_INCLUDED
137