73 lines
2.6 KiB
Plaintext
73 lines
2.6 KiB
Plaintext
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// (c) Copyright Fernando Luis Cacciola Carballal 2000-2004
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// Use, modification, and distribution is subject to the Boost Software
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See library home page at http://www.boost.org/libs/numeric/conversion
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//
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// Contact the author at: fernando_cacciola@hotmail.com
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//
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#ifndef BOOST_NUMERIC_CONVERSION_DETAIL_SIGN_MIXTURE_FLC_12NOV2002_HPP
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#define BOOST_NUMERIC_CONVERSION_DETAIL_SIGN_MIXTURE_FLC_12NOV2002_HPP
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#include "boost/config.hpp"
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#include "boost/limits.hpp"
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#include "boost/numeric/conversion/sign_mixture_enum.hpp"
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#include "boost/numeric/conversion/detail/meta.hpp"
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#include "boost/mpl/integral_c.hpp"
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namespace boost { namespace numeric { namespace convdetail
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{
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// Integral Constants for 'SignMixture'
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typedef mpl::integral_c<sign_mixture_enum, unsigned_to_unsigned> unsig2unsig_c ;
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typedef mpl::integral_c<sign_mixture_enum, signed_to_signed> sig2sig_c ;
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typedef mpl::integral_c<sign_mixture_enum, signed_to_unsigned> sig2unsig_c ;
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typedef mpl::integral_c<sign_mixture_enum, unsigned_to_signed> unsig2sig_c ;
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// Metafunction:
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//
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// get_sign_mixture<T,S>::type
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//
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// Selects the appropriate SignMixture Integral Constant for the combination T,S.
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//
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template<class T,class S>
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struct get_sign_mixture
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{
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typedef mpl::bool_< ::std::numeric_limits<S>::is_signed > S_signed ;
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typedef mpl::bool_< ::std::numeric_limits<T>::is_signed > T_signed ;
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typedef typename
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for_both<S_signed, T_signed, sig2sig_c, sig2unsig_c, unsig2sig_c, unsig2unsig_c>::type
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type ;
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} ;
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// Metafunction:
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//
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// for_sign_mixture<SignMixture,Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig>::type
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//
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// {SignMixture} is one of the Integral Constants for SignMixture, declared above.
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// {Sig2Sig,Sig2Unsig,Unsig2Sig,Unsig2Unsig} are aribtrary types. (not metafunctions)
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//
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// According to the value of 'SignMixture', selects the corresponding type.
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//
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template<class SignMixture, class Sig2Sig, class Sig2Unsig, class Unsig2Sig, class Unsig2Unsig>
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struct for_sign_mixture
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{
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typedef typename
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ct_switch4<SignMixture
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, sig2sig_c, sig2unsig_c, unsig2sig_c // default
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, Sig2Sig , Sig2Unsig , Unsig2Sig , Unsig2Unsig
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>::type
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type ;
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} ;
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} } } // namespace boost::numeric::convdetail
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#endif
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//
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///////////////////////////////////////////////////////////////////////////////////////////////
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