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Diffstat (limited to 'src/third_party/boost-1.56.0/boost/math/tools/big_constant.hpp')
-rw-r--r-- | src/third_party/boost-1.56.0/boost/math/tools/big_constant.hpp | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/third_party/boost-1.56.0/boost/math/tools/big_constant.hpp b/src/third_party/boost-1.56.0/boost/math/tools/big_constant.hpp new file mode 100644 index 00000000000..423cc1b6316 --- /dev/null +++ b/src/third_party/boost-1.56.0/boost/math/tools/big_constant.hpp @@ -0,0 +1,68 @@ + +// Copyright (c) 2011 John Maddock +// Use, modification and distribution are subject to 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_MATH_TOOLS_BIG_CONSTANT_HPP +#define BOOST_MATH_TOOLS_BIG_CONSTANT_HPP + +#include <boost/math/tools/config.hpp> +#ifndef BOOST_MATH_NO_LEXICAL_CAST +#include <boost/lexical_cast.hpp> +#endif +#include <boost/type_traits/is_convertible.hpp> +#include <boost/math/cstdfloat/cstdfloat_types.hpp> + +namespace boost{ namespace math{ + +namespace tools{ + +template <class T> +inline BOOST_CONSTEXPR_OR_CONST T make_big_value(boost::floatmax_t v, const char*, mpl::true_ const&, mpl::false_ const&) +{ + return static_cast<T>(v); +} +template <class T> +inline BOOST_CONSTEXPR_OR_CONST T make_big_value(boost::floatmax_t v, const char*, mpl::true_ const&, mpl::true_ const&) +{ + return static_cast<T>(v); +} +#ifndef BOOST_MATH_NO_LEXICAL_CAST +template <class T> +inline T make_big_value(boost::floatmax_t, const char* s, mpl::false_ const&, mpl::false_ const&) +{ + return boost::lexical_cast<T>(s); +} +#endif +template <class T> +inline BOOST_CONSTEXPR const char* make_big_value(boost::floatmax_t, const char* s, mpl::false_ const&, mpl::true_ const&) +{ + return s; +} + +// +// For constants which might fit in a long double (if it's big enough): +// +#define BOOST_MATH_BIG_CONSTANT(T, D, x)\ + boost::math::tools::make_big_value<T>(\ + BOOST_FLOATMAX_C(x), \ + BOOST_STRINGIZE(x), \ + mpl::bool_< (is_convertible<boost::floatmax_t, T>::value) && \ + ((D <= std::numeric_limits<boost::floatmax_t>::digits) \ + || is_floating_point<T>::value \ + || (std::numeric_limits<T>::is_specialized && \ + (std::numeric_limits<T>::digits10 <= std::numeric_limits<boost::floatmax_t>::digits10))) >(), \ + boost::is_convertible<const char*, T>()) +// +// For constants too huge for any conceivable long double (and which generate compiler errors if we try and declare them as such): +// +#define BOOST_MATH_HUGE_CONSTANT(T, D, x)\ + boost::math::tools::make_big_value<T>(0.0L, BOOST_STRINGIZE(x), \ + mpl::bool_<is_floating_point<T>::value || (std::numeric_limits<T>::is_specialized && std::numeric_limits<T>::max_exponent <= std::numeric_limits<long double>::max_exponent && std::numeric_limits<T>::digits <= std::numeric_limits<long double>::digits)>(), \ + boost::is_convertible<const char*, T>()) + +}}} // namespaces + +#endif + |