48 lines
2.5 KiB
C++
48 lines
2.5 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright Vicente J. Botet Escriba 2009-2011
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// Copyright 2012 John Maddock. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MP_IS_RESTRICTED_CONVERSION_HPP
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#define BOOST_MP_IS_RESTRICTED_CONVERSION_HPP
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#include <boost/multiprecision/traits/explicit_conversion.hpp>
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#include <boost/multiprecision/detail/number_base.hpp>
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namespace boost { namespace multiprecision { namespace detail {
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template <class From, class To>
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struct is_lossy_conversion
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{
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static constexpr bool category_conditional_is_true =
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( (static_cast<boost::multiprecision::number_category_type>(number_category<From>::value) == number_kind_floating_point)
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&& (static_cast<boost::multiprecision::number_category_type>(number_category<To >::value) == number_kind_integer))
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|| ( (static_cast<boost::multiprecision::number_category_type>(number_category<From>::value) == number_kind_rational)
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&& (static_cast<boost::multiprecision::number_category_type>(number_category<To >::value) == number_kind_integer))
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|| ( (static_cast<boost::multiprecision::number_category_type>(number_category<From>::value) == number_kind_fixed_point)
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&& (static_cast<boost::multiprecision::number_category_type>(number_category<To >::value) == number_kind_integer))
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|| (static_cast<boost::multiprecision::number_category_type>(number_category<From>::value) == number_kind_unknown)
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|| (static_cast<boost::multiprecision::number_category_type>(number_category<To >::value) == number_kind_unknown);
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using type = typename std::conditional<category_conditional_is_true,
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std::integral_constant<bool, true>,
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std::integral_constant<bool, false>>::type;
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static constexpr bool value = type::value;
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};
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template <typename From, typename To>
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struct is_restricted_conversion
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{
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using type = typename std::conditional<
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((is_explicitly_convertible<From, To>::value && !std::is_convertible<From, To>::value) || is_lossy_conversion<From, To>::value),
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std::integral_constant<bool, true>,
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std::integral_constant<bool, false>>::type;
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static constexpr const bool value = type::value;
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};
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}}} // namespace boost::multiprecision::detail
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#endif // BOOST_MP_IS_RESTRICTED_CONVERSION_HPP
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