[857] | 1 | // © Copyright Fernando Luis Cacciola Carballal 2000-2004
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| 2 | // Use, modification, and distribution is subject to the Boost Software
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| 3 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 4 | // http://www.boost.org/LICENSE_1_0.txt)
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| 5 |
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| 6 | // See library home page at http://www.boost.org/libs/numeric/conversion
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| 7 | //
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| 8 | // Contact the author at: fernando_cacciola@hotmail.com
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| 9 | //
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| 10 | #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_SIGN_MIXTURE_FLC_12NOV2002_HPP
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| 11 | #define BOOST_NUMERIC_CONVERSION_DETAIL_SIGN_MIXTURE_FLC_12NOV2002_HPP
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| 12 |
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| 13 | #include "boost/config.hpp"
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| 14 | #include "boost/limits.hpp"
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| 15 |
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| 16 | #include "boost/numeric/conversion/sign_mixture_enum.hpp"
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| 17 | #include "boost/numeric/conversion/detail/meta.hpp"
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| 18 |
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| 19 | #include "boost/mpl/integral_c.hpp"
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| 20 |
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| 21 | namespace boost { namespace numeric { namespace convdetail
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| 22 | {
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| 23 | // Integral Constants for 'SignMixture'
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| 24 | typedef mpl::integral_c<sign_mixture_enum, unsigned_to_unsigned> unsig2unsig_c ;
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| 25 | typedef mpl::integral_c<sign_mixture_enum, signed_to_signed> sig2sig_c ;
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| 26 | typedef mpl::integral_c<sign_mixture_enum, signed_to_unsigned> sig2unsig_c ;
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| 27 | typedef mpl::integral_c<sign_mixture_enum, unsigned_to_signed> unsig2sig_c ;
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| 28 |
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| 29 | // Metafunction:
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| 30 | //
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| 31 | // get_sign_mixture<T,S>::type
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| 32 | //
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| 33 | // Selects the appropriate SignMixture Integral Constant for the combination T,S.
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| 34 | //
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| 35 | template<class T,class S>
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| 36 | struct get_sign_mixture
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| 37 | {
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| 38 | typedef mpl::bool_< ::std::numeric_limits<S>::is_signed > S_signed ;
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| 39 | typedef mpl::bool_< ::std::numeric_limits<T>::is_signed > T_signed ;
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| 40 |
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| 41 | typedef typename
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| 42 | for_both<S_signed, T_signed, sig2sig_c, sig2unsig_c, unsig2sig_c, unsig2unsig_c>::type
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| 43 | type ;
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| 44 | } ;
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| 45 |
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| 46 | // Metafunction:
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| 47 | //
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| 48 | // for_sign_mixture<SignMixture,Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig>::type
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| 49 | //
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| 50 | // {SignMixture} is one of the Integral Constants for SignMixture, declared above.
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| 51 | // {Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig} are aribtrary types. (not metafunctions)
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| 52 | //
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| 53 | // According to the value of 'SignMixture', selects the corresponding type.
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| 54 | //
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| 55 | template<class SignMixture, class Sig2Sig, class Sig2Unsig, class Unsig2Sig, class Unsig2Unsig>
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| 56 | struct for_sign_mixture
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| 57 | {
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| 58 | typedef typename
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| 59 | ct_switch4<SignMixture
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| 60 | , sig2sig_c, sig2unsig_c, unsig2sig_c // default
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| 61 | , Sig2Sig , Sig2Unsig , Unsig2Sig , Unsig2Unsig
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| 62 | >::type
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| 63 | type ;
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| 64 | } ;
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| 65 |
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| 66 | } } } // namespace boost::numeric::convdetail
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| 67 |
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| 68 | #endif
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| 69 | //
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| 70 | ///////////////////////////////////////////////////////////////////////////////////////////////
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| 71 |
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| 72 |
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