ceph/src/boost/boost/multiprecision/traits/is_restricted_conversion.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //  Copyright Vicente J. Botet Escriba 2009-2011
   3 //  Copyright 2012 John Maddock. Distributed under the Boost
   4 //  Software License, Version 1.0. (See accompanying file
   5 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #ifndef BOOST_MP_RESTRICTED_CONVERSION_HPP
   8 #define BOOST_MP_RESTRICTED_CONVERSION_HPP
   9
  10 #include <boost/multiprecision/traits/explicit_conversion.hpp>
  11 #include <boost/mpl/if.hpp>
  12 #include <boost/multiprecision/detail/number_base.hpp>
  13
  14 namespace boost { namespace multiprecision { namespace detail {
  15
  16 template <class From, class To>
  17 struct is_lossy_conversion
  18 {
  19    typedef typename mpl::if_c<
  20        ((number_category<From>::value == number_kind_floating_point) && (number_category<To>::value == number_kind_integer))
  21            /* || ((number_category<From>::value == number_kind_floating_point) && (number_category<To>::value == number_kind_rational))*/
  22            || ((number_category<From>::value == number_kind_rational) && (number_category<To>::value == number_kind_integer)) || ((number_category<From>::value == number_kind_fixed_point) && (number_category<To>::value == number_kind_integer)) || (number_category<From>::value == number_kind_unknown) || (number_category<To>::value == number_kind_unknown),
  23        mpl::true_,
  24        mpl::false_>::type type;
  25    static const bool      value = type::value;
  26 };
  27
  28 template <typename From, typename To>
  29 struct is_restricted_conversion
  30 {
  31    typedef typename mpl::if_c<
  32        ((is_explicitly_convertible<From, To>::value && !is_convertible<From, To>::value) || is_lossy_conversion<From, To>::value),
  33        mpl::true_,
  34        mpl::false_>::type type;
  35    static const bool      value = type::value;
  36 };
  37
  38 }}} // namespace boost::multiprecision::detail
  39
  40 #endif // BOOST_MP_RESTRICTED_CONVERSION_HPP