Imported Upstream version 1.67.0upstream/1.67.0

1 files changed, 47 insertions, 0 deletions

diff --git a/boost/atomic/detail/type_traits/is_iec559.hpp b/boost/atomic/detail/type_traits/is_iec559.hpp
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+++ b/boost/atomic/detail/type_traits/is_iec559.hpp
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+/*
+ * 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)
+ *
+ * Copyright (c) 2018 Andrey Semashev
+ */
+/*!
+ * \file   atomic/detail/type_traits/is_iec559.hpp
+ *
+ * This header defines \c is_iec559 type trait
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_TYPE_TRAITS_IS_IEC559_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_TYPE_TRAITS_IS_IEC559_HPP_INCLUDED_
+
+#include <limits>
+#include <boost/atomic/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+template< typename T >
+struct is_iec559
+{
+    static BOOST_CONSTEXPR_OR_CONST bool value = !!std::numeric_limits< T >::is_iec559;
+};
+
+#if defined(BOOST_HAS_FLOAT128)
+// libstdc++ does not specialize numeric_limits for __float128
+template< >
+struct is_iec559< boost::float128_type >
+{
+    static BOOST_CONSTEXPR_OR_CONST bool value = true;
+};
+#endif // defined(BOOST_HAS_FLOAT128)
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#endif // BOOST_ATOMIC_DETAIL_TYPE_TRAITS_IS_IEC559_HPP_INCLUDED_