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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 | { | |
29 | 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 | { | |
39 | 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 | { | |
49 | 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 | { | |
93 | 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> | |
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 |