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1 | // (c) 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_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP | |
11 | #define BOOST_NUMERIC_CONVERSION_DETAIL_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP | |
12 | ||
13 | #include "boost/config.hpp" | |
14 | #include "boost/limits.hpp" | |
15 | ||
16 | #include "boost/numeric/conversion/int_float_mixture_enum.hpp" | |
17 | #include "boost/numeric/conversion/detail/meta.hpp" | |
18 | ||
19 | #include "boost/mpl/integral_c.hpp" | |
20 | ||
21 | namespace boost { namespace numeric { namespace convdetail | |
22 | { | |
23 | // Integral Constants for 'IntFloatMixture' | |
24 | typedef mpl::integral_c<int_float_mixture_enum, integral_to_integral> int2int_c ; | |
25 | typedef mpl::integral_c<int_float_mixture_enum, integral_to_float> int2float_c ; | |
26 | typedef mpl::integral_c<int_float_mixture_enum, float_to_integral> float2int_c ; | |
27 | typedef mpl::integral_c<int_float_mixture_enum, float_to_float> float2float_c ; | |
28 | ||
29 | // Metafunction: | |
30 | // | |
31 | // get_int_float_mixture<T,S>::type | |
32 | // | |
33 | // Selects the appropriate Int-Float Mixture Integral Constant for the combination T,S. | |
34 | // | |
35 | template<class T,class S> | |
36 | struct get_int_float_mixture | |
37 | { | |
38 | typedef mpl::bool_< ::std::numeric_limits<S>::is_integer > S_int ; | |
39 | typedef mpl::bool_< ::std::numeric_limits<T>::is_integer > T_int ; | |
40 | ||
41 | typedef typename | |
42 | for_both<S_int, T_int, int2int_c, int2float_c, float2int_c, float2float_c>::type | |
43 | type ; | |
44 | } ; | |
45 | ||
46 | // Metafunction: | |
47 | // | |
48 | // for_int_float_mixture<Mixture,int_int,int_float,float_int,float_float>::type | |
49 | // | |
50 | // {Mixture} is one of the Integral Constants for Mixture, declared above. | |
51 | // {int_int,int_float,float_int,float_float} are aribtrary types. (not metafunctions) | |
52 | // | |
53 | // According to the value of 'IntFloatMixture', selects the corresponding type. | |
54 | // | |
55 | template<class IntFloatMixture, class Int2Int, class Int2Float, class Float2Int, class Float2Float> | |
56 | struct for_int_float_mixture | |
57 | { | |
58 | typedef typename | |
59 | ct_switch4<IntFloatMixture | |
60 | ,int2int_c, int2float_c, float2int_c // default | |
61 | ,Int2Int , Int2Float , Float2Int , Float2Float | |
62 | >::type | |
63 | type ; | |
64 | } ; | |
65 | ||
66 | } } } // namespace boost::numeric::convdetail | |
67 | ||
68 | #endif | |
69 | // | |
70 | /////////////////////////////////////////////////////////////////////////////////////////////// | |
71 | ||
72 |