1 /*============================================================================= 2 Copyright (c) 2001-2014 Joel de Guzman 3 Copyright (c) 2001-2011 Hartmut Kaiser 4 http://spirit.sourceforge.net/ 5 6 Distributed under the Boost Software License, Version 1.0. (See accompanying 7 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 8 =============================================================================*/ 9 #if !defined(BOOST_SPIRIT_X3_POW10_DECEMBER_26_2008_1118AM) 10 #define BOOST_SPIRIT_X3_POW10_DECEMBER_26_2008_1118AM 11 12 #include <boost/config/no_tr1/cmath.hpp> 13 #include <boost/limits.hpp> 14 #include <boost/spirit/home/x3/support/unused.hpp> 15 #include <boost/spirit/home/x3/support/traits/numeric_traits.hpp> 16 17 #if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) 18 # pragma warning(push) 19 # pragma warning(disable: 4244) // conversion from 'double' to 'float', possible loss of data 20 #endif 21 22 namespace boost { namespace spirit { namespace x3 { namespace traits 23 { 24 namespace detail 25 { 26 template <typename T, typename Enable = void> 27 struct pow10_helper 28 { callboost::spirit::x3::traits::detail::pow10_helper29 static T call(unsigned dim) 30 { 31 using namespace std; // allow for ADL to find the correct overload 32 return pow(T(10), T(dim)); 33 } 34 }; 35 36 template <> 37 struct pow10_helper<unused_type> 38 { callboost::spirit::x3::traits::detail::pow10_helper39 static unused_type call(unused_type) 40 { 41 return unused; 42 } 43 }; 44 45 #if (DBL_MAX_10_EXP == 308) // for IEEE-754 46 template <> 47 struct pow10_helper<double> 48 { callboost::spirit::x3::traits::detail::pow10_helper49 static double call(unsigned dim) 50 { 51 static double const exponents[] = 52 { 53 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 54 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 55 1e20, 1e21, 1e22, 1e23, 1e24, 1e25, 1e26, 1e27, 1e28, 1e29, 56 1e30, 1e31, 1e32, 1e33, 1e34, 1e35, 1e36, 1e37, 1e38, 1e39, 57 1e40, 1e41, 1e42, 1e43, 1e44, 1e45, 1e46, 1e47, 1e48, 1e49, 58 1e50, 1e51, 1e52, 1e53, 1e54, 1e55, 1e56, 1e57, 1e58, 1e59, 59 1e60, 1e61, 1e62, 1e63, 1e64, 1e65, 1e66, 1e67, 1e68, 1e69, 60 1e70, 1e71, 1e72, 1e73, 1e74, 1e75, 1e76, 1e77, 1e78, 1e79, 61 1e80, 1e81, 1e82, 1e83, 1e84, 1e85, 1e86, 1e87, 1e88, 1e89, 62 1e90, 1e91, 1e92, 1e93, 1e94, 1e95, 1e96, 1e97, 1e98, 1e99, 63 1e100, 1e101, 1e102, 1e103, 1e104, 1e105, 1e106, 1e107, 1e108, 1e109, 64 1e110, 1e111, 1e112, 1e113, 1e114, 1e115, 1e116, 1e117, 1e118, 1e119, 65 1e120, 1e121, 1e122, 1e123, 1e124, 1e125, 1e126, 1e127, 1e128, 1e129, 66 1e130, 1e131, 1e132, 1e133, 1e134, 1e135, 1e136, 1e137, 1e138, 1e139, 67 1e140, 1e141, 1e142, 1e143, 1e144, 1e145, 1e146, 1e147, 1e148, 1e149, 68 1e150, 1e151, 1e152, 1e153, 1e154, 1e155, 1e156, 1e157, 1e158, 1e159, 69 1e160, 1e161, 1e162, 1e163, 1e164, 1e165, 1e166, 1e167, 1e168, 1e169, 70 1e170, 1e171, 1e172, 1e173, 1e174, 1e175, 1e176, 1e177, 1e178, 1e179, 71 1e180, 1e181, 1e182, 1e183, 1e184, 1e185, 1e186, 1e187, 1e188, 1e189, 72 1e190, 1e191, 1e192, 1e193, 1e194, 1e195, 1e196, 1e197, 1e198, 1e199, 73 1e200, 1e201, 1e202, 1e203, 1e204, 1e205, 1e206, 1e207, 1e208, 1e209, 74 1e210, 1e211, 1e212, 1e213, 1e214, 1e215, 1e216, 1e217, 1e218, 1e219, 75 1e220, 1e221, 1e222, 1e223, 1e224, 1e225, 1e226, 1e227, 1e228, 1e229, 76 1e230, 1e231, 1e232, 1e233, 1e234, 1e235, 1e236, 1e237, 1e238, 1e239, 77 1e240, 1e241, 1e242, 1e243, 1e244, 1e245, 1e246, 1e247, 1e248, 1e249, 78 1e250, 1e251, 1e252, 1e253, 1e254, 1e255, 1e256, 1e257, 1e258, 1e259, 79 1e260, 1e261, 1e262, 1e263, 1e264, 1e265, 1e266, 1e267, 1e268, 1e269, 80 1e270, 1e271, 1e272, 1e273, 1e274, 1e275, 1e276, 1e277, 1e278, 1e279, 81 1e280, 1e281, 1e282, 1e283, 1e284, 1e285, 1e286, 1e287, 1e288, 1e289, 82 1e290, 1e291, 1e292, 1e293, 1e294, 1e295, 1e296, 1e297, 1e298, 1e299, 83 1e300, 1e301, 1e302, 1e303, 1e304, 1e305, 1e306, 1e307, 1e308, 84 }; 85 BOOST_ASSERT(dim < sizeof(exponents)/sizeof(double)); 86 return exponents[dim]; 87 } 88 }; 89 90 template <> 91 struct pow10_helper<float> 92 { callboost::spirit::x3::traits::detail::pow10_helper93 static float call(unsigned dim) 94 { 95 return pow10_helper<double>::call(dim); 96 } 97 }; 98 #endif // for IEEE-754 99 } 100 101 template <typename T> pow10(unsigned dim)102 inline T pow10(unsigned dim) 103 { 104 return detail::pow10_helper<T>::call(dim); 105 } 106 }}}} 107 108 #if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) 109 # pragma warning(pop) 110 #endif 111 112 #endif 113