52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Copyright 2021 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_IS_CONVERTIBLE_ARITHMETIC_HPP
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#define BOOST_IS_CONVERTIBLE_ARITHMETIC_HPP
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#include <type_traits>
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#include <boost/multiprecision/detail/number_base.hpp>
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#include <boost/multiprecision/detail/standalone_config.hpp>
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namespace boost { namespace multiprecision { namespace detail {
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template <class V, class Backend>
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struct is_convertible_arithmetic
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{
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static constexpr bool value = boost::multiprecision::detail::is_arithmetic<V>::value;
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};
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//
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// For extension types, we don't *require* interoperability,
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// so only enable it if we can convert the type to the backend
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// losslessly, ie not via conversion to a narrower type.
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// Note that backends with templated constructors/=operators
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// will not be selected here, so these need to either specialize
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// this trait, or provide a proper non-template constructor/=operator
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// for the extension types it supports.
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//
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#ifdef BOOST_HAS_FLOAT128
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template <class Backend>
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struct is_convertible_arithmetic<float128_type, Backend>
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{
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static constexpr bool value = std::is_assignable<Backend, convertible_to<float128_type>>::value;
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};
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#endif
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#ifdef BOOST_HAS_INT128
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template <class Backend>
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struct is_convertible_arithmetic<int128_type, Backend>
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{
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static constexpr bool value = std::is_assignable<Backend, convertible_to<int128_type>>::value;
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};
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template <class Backend>
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struct is_convertible_arithmetic<uint128_type, Backend>
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{
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static constexpr bool value = std::is_assignable<Backend, convertible_to<uint128_type>>::value;
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};
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#endif
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}}} // namespace boost::multiprecision::detail
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#endif // BOOST_IS_BYTE_CONTAINER_HPP
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