source: NonGTP/Boost/boost/numeric/conversion/detail/conversion_traits.hpp @ 857

Revision 857, 3.6 KB checked in by igarcia, 19 years ago (diff)
Line 
1//  © Copyright Fernando Luis Cacciola Carballal 2000-2004
2//  Use, modification, and distribution is subject to the Boost Software
3//  License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
4//  http://www.boost.org/LICENSE_1_0.txt)
5
6//  See library home page at http://www.boost.org/libs/numeric/conversion
7//
8// Contact the author at: fernando_cacciola@hotmail.com
9//
10#ifndef BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP
11#define BOOST_NUMERIC_CONVERSION_DETAIL_CONVERSION_TRAITS_FLC_12NOV2002_HPP
12
13#include "boost/type_traits/is_arithmetic.hpp"
14#include "boost/type_traits/is_same.hpp"
15#include "boost/type_traits/remove_cv.hpp"
16
17#include "boost/numeric/conversion/detail/meta.hpp"
18#include "boost/numeric/conversion/detail/int_float_mixture.hpp"
19#include "boost/numeric/conversion/detail/sign_mixture.hpp"
20#include "boost/numeric/conversion/detail/udt_builtin_mixture.hpp"
21#include "boost/numeric/conversion/detail/is_subranged.hpp"
22
23namespace boost { namespace numeric { namespace convdetail
24{
25  //-------------------------------------------------------------------
26  // Implementation of the Conversion Traits for T != S
27  //
28  // This is a VISIBLE base class of the user-level conversion_traits<> class.
29  //-------------------------------------------------------------------
30  template<class T,class S>
31  struct non_trivial_traits_impl
32  {
33    typedef typename get_int_float_mixture   <T,S>::type int_float_mixture ;
34    typedef typename get_sign_mixture        <T,S>::type sign_mixture ;
35    typedef typename get_udt_builtin_mixture <T,S>::type udt_builtin_mixture ;
36
37    typedef typename get_is_subranged<T,S>::type subranged ;
38
39    typedef mpl::false_ trivial ;
40
41    typedef T target_type ;
42    typedef S source_type ;
43    typedef T result_type ;
44
45    typedef typename mpl::if_< is_arithmetic<S>, S, S const&>::type argument_type ;
46
47    typedef typename mpl::if_<subranged,S,T>::type supertype ;
48    typedef typename mpl::if_<subranged,T,S>::type subtype   ;
49  } ;
50
51  //-------------------------------------------------------------------
52  // Implementation of the Conversion Traits for T == S
53  //
54  // This is a VISIBLE base class of the user-level conversion_traits<> class.
55  //-------------------------------------------------------------------
56  template<class N>
57  struct trivial_traits_impl
58  {
59    typedef typename get_int_float_mixture  <N,N>::type int_float_mixture ;
60    typedef typename get_sign_mixture       <N,N>::type sign_mixture ;
61    typedef typename get_udt_builtin_mixture<N,N>::type udt_builtin_mixture ;
62
63    typedef mpl::false_ subranged ;
64    typedef mpl::true_  trivial ;
65
66    typedef N        target_type ;
67    typedef N        source_type ;
68    typedef N const& result_type ;
69    typedef N const& argument_type ;
70
71    typedef N supertype ;
72    typedef N subtype  ;
73
74  } ;
75
76  //-------------------------------------------------------------------
77  // Top level implementation selector.
78  //-------------------------------------------------------------------
79  template<class T, class S>
80  struct get_conversion_traits
81  {
82    typedef typename remove_cv<T>::type target_type ;
83    typedef typename remove_cv<S>::type source_type ;
84
85    typedef typename is_same<target_type,source_type>::type is_trivial ;
86
87    typedef trivial_traits_impl    <target_type>             trivial_imp ;
88    typedef non_trivial_traits_impl<target_type,source_type> non_trivial_imp ;
89
90    typedef typename mpl::if_<is_trivial,trivial_imp,non_trivial_imp>::type type ;
91  } ;
92
93} } } // namespace boost::numeric::convdetail
94
95#endif
96
97
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