Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+///////////////////////////////////////////////////////////////////////////////
+//  Copyright Vicente J. Botet Escriba 2009-2011
+//  Copyright 2012 John Maddock. Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_MP_RESTRICTED_CONVERSION_HPP
+#define BOOST_MP_RESTRICTED_CONVERSION_HPP
+
+#include <boost/multiprecision/traits/explicit_conversion.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/multiprecision/detail/number_base.hpp>
+
+namespace boost{ namespace multiprecision{ namespace detail{
+
+
+template <class From, class To>
+struct is_lossy_conversion
+{
+   typedef typename mpl::if_c<
+      ((number_category<From>::value == number_kind_floating_point) && (number_category<To>::value == number_kind_integer))
+      /* || ((number_category<From>::value == number_kind_floating_point) && (number_category<To>::value == number_kind_rational))*/
+      || ((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),
+      mpl::true_,
+      mpl::false_
+   >::type type;
+   static const bool value = type::value;
+};
+
+template<typename From, typename To>
+struct is_restricted_conversion
+{
+   typedef typename mpl::if_c<
+      ((is_explicitly_convertible<From, To>::value && !is_convertible<From, To>::value)
+      || is_lossy_conversion<From, To>::value),
+      mpl::true_,
+      mpl::false_
+   >::type type;
+   static const bool value = type::value;
+};
+
+}}} // namespaces
+
+#endif // BOOST_MP_RESTRICTED_CONVERSION_HPP
+