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68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
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// Copyright (c) 2011 John Maddock
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// Use, modification and distribution are subject to the
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// Boost 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_MATH_TOOLS_BIG_CONSTANT_HPP
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#define BOOST_MATH_TOOLS_BIG_CONSTANT_HPP
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#include <boost/math/tools/config.hpp>
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#ifndef BOOST_MATH_NO_LEXICAL_CAST
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#include <boost/lexical_cast.hpp>
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#endif
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#include <boost/type_traits/is_convertible.hpp>
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namespace boost{ namespace math{
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namespace tools{
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template <class T>
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inline BOOST_CONSTEXPR_OR_CONST T make_big_value(long double v, const char*, mpl::true_ const&, mpl::false_ const&)
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{
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return static_cast<T>(v);
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}
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template <class T>
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inline BOOST_CONSTEXPR_OR_CONST T make_big_value(long double v, const char*, mpl::true_ const&, mpl::true_ const&)
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{
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return static_cast<T>(v);
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}
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#ifndef BOOST_MATH_NO_LEXICAL_CAST
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template <class T>
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inline T make_big_value(long double, const char* s, mpl::false_ const&, mpl::false_ const&)
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{
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return boost::lexical_cast<T>(s);
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}
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#endif
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template <class T>
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inline BOOST_CONSTEXPR const char* make_big_value(long double, const char* s, mpl::false_ const&, mpl::true_ const&)
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{
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return s;
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}
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//
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// For constants which might fit in a long double (if it's big enough):
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//
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#define BOOST_MATH_BIG_CONSTANT(T, D, x)\
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boost::math::tools::make_big_value<T>(\
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BOOST_JOIN(x, L), \
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BOOST_STRINGIZE(x), \
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mpl::bool_< (is_convertible<long double, T>::value) && \
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((D <= std::numeric_limits<long double>::digits) \
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|| is_floating_point<T>::value \
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|| (std::numeric_limits<T>::is_specialized && \
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(std::numeric_limits<T>::digits10 <= std::numeric_limits<long double>::digits10))) >(), \
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boost::is_convertible<const char*, T>())
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//
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// For constants too huge for any conceivable long double (and which generate compiler errors if we try and declare them as such):
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//
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#define BOOST_MATH_HUGE_CONSTANT(T, D, x)\
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boost::math::tools::make_big_value<T>(0.0L, BOOST_STRINGIZE(x), \
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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)>(), \
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boost::is_convertible<const char*, T>())
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}}} // namespaces
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#endif
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