epoc32/include/stdapis/boost/numeric/conversion/detail/sign_mixture.hpp
author William Roberts <williamr@symbian.org>
Tue, 16 Mar 2010 16:12:26 +0000
branchSymbian2
changeset 2 2fe1408b6811
permissions -rw-r--r--
Final list of Symbian^2 public API header files
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//  © 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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