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/Src/Dependencies/Boost/boost/spirit/home/support/detail/pow10.hpp

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C++ Header | 113 lines | 95 code | 10 blank | 8 comment | 1 complexity | 4b7d9fdb70ba8174435f4c960f979f46 MD5 | raw file
  1/*=============================================================================
  2    Copyright (c) 2001-2011 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(SPIRIT_POW10_DECEMBER_26_2008_1118AM)
 10#define SPIRIT_POW10_DECEMBER_26_2008_1118AM
 11
 12#if defined(_MSC_VER)
 13#pragma once
 14#endif
 15
 16#include <boost/config/no_tr1/cmath.hpp>
 17#include <boost/limits.hpp>
 18#include <boost/spirit/home/support/unused.hpp>
 19#include <boost/spirit/home/support/numeric_traits.hpp>
 20
 21#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
 22# pragma warning(push)
 23# pragma warning(disable: 4244)   // conversion from 'double' to 'float', possible loss of data
 24#endif
 25
 26namespace boost { namespace spirit { namespace traits
 27{
 28    template <typename T, typename Enable/* = void*/>
 29    struct pow10_helper
 30    {
 31        static T call(unsigned dim)
 32        {
 33            using namespace std;    // allow for ADL to find the correct overload
 34            return pow(T(10), T(dim));
 35        }
 36    };
 37
 38    template <>
 39    struct pow10_helper<unused_type>
 40    {
 41        static unused_type call(unused_type)
 42        {
 43            return unused;
 44        }
 45    };
 46
 47#if (DBL_MAX_EXP == 308) // for IEEE-754
 48    template <>
 49    struct pow10_helper<double>
 50    {
 51        static double call(unsigned dim)
 52        {
 53            static double const exponents[] =
 54            {
 55                1e0,   1e1,   1e2,   1e3,   1e4,   1e5,   1e6,   1e7,   1e8,    1e9,
 56                1e10,  1e11,  1e12,  1e13,  1e14,  1e15,  1e16,  1e17,  1e18,  1e19,
 57                1e20,  1e21,  1e22,  1e23,  1e24,  1e25,  1e26,  1e27,  1e28,  1e29,
 58                1e30,  1e31,  1e32,  1e33,  1e34,  1e35,  1e36,  1e37,  1e38,  1e39,
 59                1e40,  1e41,  1e42,  1e43,  1e44,  1e45,  1e46,  1e47,  1e48,  1e49,
 60                1e50,  1e51,  1e52,  1e53,  1e54,  1e55,  1e56,  1e57,  1e58,  1e59,
 61                1e60,  1e61,  1e62,  1e63,  1e64,  1e65,  1e66,  1e67,  1e68,  1e69,
 62                1e70,  1e71,  1e72,  1e73,  1e74,  1e75,  1e76,  1e77,  1e78,  1e79,
 63                1e80,  1e81,  1e82,  1e83,  1e84,  1e85,  1e86,  1e87,  1e88,  1e89,
 64                1e90,  1e91,  1e92,  1e93,  1e94,  1e95,  1e96,  1e97,  1e98,  1e99,
 65                1e100, 1e101, 1e102, 1e103, 1e104, 1e105, 1e106, 1e107, 1e108, 1e109,
 66                1e110, 1e111, 1e112, 1e113, 1e114, 1e115, 1e116, 1e117, 1e118, 1e119,
 67                1e120, 1e121, 1e122, 1e123, 1e124, 1e125, 1e126, 1e127, 1e128, 1e129,
 68                1e130, 1e131, 1e132, 1e133, 1e134, 1e135, 1e136, 1e137, 1e138, 1e139,
 69                1e140, 1e141, 1e142, 1e143, 1e144, 1e145, 1e146, 1e147, 1e148, 1e149,
 70                1e150, 1e151, 1e152, 1e153, 1e154, 1e155, 1e156, 1e157, 1e158, 1e159,
 71                1e160, 1e161, 1e162, 1e163, 1e164, 1e165, 1e166, 1e167, 1e168, 1e169,
 72                1e170, 1e171, 1e172, 1e173, 1e174, 1e175, 1e176, 1e177, 1e178, 1e179,
 73                1e180, 1e181, 1e182, 1e183, 1e184, 1e185, 1e186, 1e187, 1e188, 1e189,
 74                1e190, 1e191, 1e192, 1e193, 1e194, 1e195, 1e196, 1e197, 1e198, 1e199,
 75                1e200, 1e201, 1e202, 1e203, 1e204, 1e205, 1e206, 1e207, 1e208, 1e209,
 76                1e210, 1e211, 1e212, 1e213, 1e214, 1e215, 1e216, 1e217, 1e218, 1e219,
 77                1e220, 1e221, 1e222, 1e223, 1e224, 1e225, 1e226, 1e227, 1e228, 1e229,
 78                1e230, 1e231, 1e232, 1e233, 1e234, 1e235, 1e236, 1e237, 1e238, 1e239,
 79                1e240, 1e241, 1e242, 1e243, 1e244, 1e245, 1e246, 1e247, 1e248, 1e249,
 80                1e250, 1e251, 1e252, 1e253, 1e254, 1e255, 1e256, 1e257, 1e258, 1e259,
 81                1e260, 1e261, 1e262, 1e263, 1e264, 1e265, 1e266, 1e267, 1e268, 1e269,
 82                1e270, 1e271, 1e272, 1e273, 1e274, 1e275, 1e276, 1e277, 1e278, 1e279,
 83                1e280, 1e281, 1e282, 1e283, 1e284, 1e285, 1e286, 1e287, 1e288, 1e289,
 84                1e290, 1e291, 1e292, 1e293, 1e294, 1e295, 1e296, 1e297, 1e298, 1e299,
 85                1e300, 1e301, 1e302, 1e303, 1e304, 1e305, 1e306, 1e307, 1e308,
 86            };
 87            BOOST_ASSERT(dim < sizeof(exponents)/sizeof(double));
 88            return exponents[dim];
 89        }
 90    };
 91
 92    template <>
 93    struct pow10_helper<double>
 94    {
 95        inline float pow10<float>(unsigned dim)
 96        {
 97            return pow10_helper<double>::call(dim);
 98        }
 99    };
100#endif // for IEEE-754
101
102    template <typename T>
103    inline T pow10(unsigned dim)
104    {
105        return pow10_helper<T>::call(dim);
106    }
107}}}
108
109#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
110# pragma warning(pop)
111#endif
112
113#endif