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path: root/boost/math/tools/big_constant.hpp
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 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 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 #ifndef BOOST_MATH_NO_LEXICAL_CAST #include #endif #include #include namespace boost{ namespace math{ namespace tools{ template inline BOOST_CONSTEXPR_OR_CONST T make_big_value(boost::floatmax_t v, const char*, mpl::true_ const&, mpl::false_ const&) { return static_cast(v); } template inline BOOST_CONSTEXPR_OR_CONST T make_big_value(boost::floatmax_t v, const char*, mpl::true_ const&, mpl::true_ const&) { return static_cast(v); } #ifndef BOOST_MATH_NO_LEXICAL_CAST template inline T make_big_value(boost::floatmax_t, const char* s, mpl::false_ const&, mpl::false_ const&) { return boost::lexical_cast(s); } #endif template 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(\ BOOST_FLOATMAX_C(x), \ BOOST_STRINGIZE(x), \ mpl::bool_< (is_convertible::value) && \ ((D <= std::numeric_limits::digits) \ || is_floating_point::value \ || (std::numeric_limits::is_specialized && \ (std::numeric_limits::digits10 <= std::numeric_limits::digits10))) >(), \ boost::is_convertible()) // // 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(0.0L, BOOST_STRINGIZE(x), \ mpl::bool_::value || (std::numeric_limits::is_specialized && std::numeric_limits::max_exponent <= std::numeric_limits::max_exponent && std::numeric_limits::digits <= std::numeric_limits::digits)>(), \ boost::is_convertible()) }}} // namespaces #endif ``````