Jeff Thompson | ef2d5a4 | 2013-08-22 19:09:24 -0700 | [diff] [blame^] | 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_SIGN_MIXTURE_FLC_12NOV2002_HPP |
| 11 | #define BOOST_NUMERIC_CONVERSION_DETAIL_SIGN_MIXTURE_FLC_12NOV2002_HPP |
| 12 | |
| 13 | #include "ndnboost/config.hpp" |
| 14 | #include "ndnboost/limits.hpp" |
| 15 | |
| 16 | #include "ndnboost/numeric/conversion/sign_mixture_enum.hpp" |
| 17 | #include "ndnboost/numeric/conversion/detail/meta.hpp" |
| 18 | |
| 19 | #include "ndnboost/mpl/integral_c.hpp" |
| 20 | |
| 21 | namespace ndnboost { namespace numeric { namespace convdetail |
| 22 | { |
| 23 | // Integral Constants for 'SignMixture' |
| 24 | typedef mpl::integral_c<sign_mixture_enum, unsigned_to_unsigned> unsig2unsig_c ; |
| 25 | typedef mpl::integral_c<sign_mixture_enum, signed_to_signed> sig2sig_c ; |
| 26 | typedef mpl::integral_c<sign_mixture_enum, signed_to_unsigned> sig2unsig_c ; |
| 27 | typedef mpl::integral_c<sign_mixture_enum, unsigned_to_signed> unsig2sig_c ; |
| 28 | |
| 29 | // Metafunction: |
| 30 | // |
| 31 | // get_sign_mixture<T,S>::type |
| 32 | // |
| 33 | // Selects the appropriate SignMixture Integral Constant for the combination T,S. |
| 34 | // |
| 35 | template<class T,class S> |
| 36 | struct get_sign_mixture |
| 37 | { |
| 38 | typedef mpl::bool_< ::std::numeric_limits<S>::is_signed > S_signed ; |
| 39 | typedef mpl::bool_< ::std::numeric_limits<T>::is_signed > T_signed ; |
| 40 | |
| 41 | typedef typename |
| 42 | for_both<S_signed, T_signed, sig2sig_c, sig2unsig_c, unsig2sig_c, unsig2unsig_c>::type |
| 43 | type ; |
| 44 | } ; |
| 45 | |
| 46 | // Metafunction: |
| 47 | // |
| 48 | // for_sign_mixture<SignMixture,Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig>::type |
| 49 | // |
| 50 | // {SignMixture} is one of the Integral Constants for SignMixture, declared above. |
| 51 | // {Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig} are aribtrary types. (not metafunctions) |
| 52 | // |
| 53 | // According to the value of 'SignMixture', selects the corresponding type. |
| 54 | // |
| 55 | template<class SignMixture, class Sig2Sig, class Sig2Unsig, class Unsig2Sig, class Unsig2Unsig> |
| 56 | struct for_sign_mixture |
| 57 | { |
| 58 | typedef typename |
| 59 | ct_switch4<SignMixture |
| 60 | , sig2sig_c, sig2unsig_c, unsig2sig_c // default |
| 61 | , Sig2Sig , Sig2Unsig , Unsig2Sig , Unsig2Unsig |
| 62 | >::type |
| 63 | type ; |
| 64 | } ; |
| 65 | |
| 66 | } } } // namespace ndnboost::numeric::convdetail |
| 67 | |
| 68 | #endif |
| 69 | // |
| 70 | /////////////////////////////////////////////////////////////////////////////////////////////// |
| 71 | |
| 72 | |