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1 | //////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // Copyright Vicente J. Botet Escriba 2010 | |
4 | // | |
5 | // Distributed under the Boost Software License, Version 1.0. | |
6 | // (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | // | |
9 | // See http://www.boost.org/libs/mpl for documentation. | |
10 | // | |
11 | //////////////////////////////////////////////////////////////////// | |
12 | #ifndef BOOST_MPL_ABS_HPP_INCLUDED | |
13 | #define BOOST_MPL_ABS_HPP_INCLUDED | |
14 | ||
15 | #include <boost/mpl/integral_c.hpp> | |
16 | #include <boost/mpl/aux_/na_spec.hpp> | |
17 | #include <boost/mpl/aux_/lambda_support.hpp> | |
18 | #include <boost/mpl/aux_/config/integral.hpp> | |
19 | #include <boost/mpl/aux_/config/static_constant.hpp> | |
20 | ||
21 | #if !defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) \ | |
22 | && !defined(BOOST_MPL_PREPROCESSING_MODE) \ | |
23 | && !defined(__CUDACC__) \ | |
24 | && ( defined(BOOST_MSVC) \ | |
25 | || BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \ | |
26 | ) | |
27 | ||
28 | # define BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2 | |
29 | ||
30 | #endif | |
31 | ||
32 | namespace boost { namespace mpl { | |
33 | ||
34 | template< typename Tag > struct abs_impl; | |
35 | ||
36 | template< typename T > struct abs_tag | |
37 | { | |
38 | typedef typename T::tag type; | |
39 | }; | |
40 | ||
41 | template< | |
42 | typename BOOST_MPL_AUX_NA_PARAM(N) | |
43 | > | |
44 | struct abs | |
45 | : abs_impl< | |
46 | typename abs_tag<N>::type | |
47 | >::template apply<N>::type | |
48 | { | |
49 | BOOST_MPL_AUX_LAMBDA_SUPPORT(1, abs, (N)) | |
50 | }; | |
51 | ||
52 | BOOST_MPL_AUX_NA_SPEC(1, abs) | |
53 | ||
54 | template< | |
55 | typename T | |
56 | , T n1 | |
57 | > | |
58 | struct abs_c | |
59 | : abs<integral_c<T,n1> > | |
60 | { | |
61 | }; | |
62 | ||
63 | #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) | |
64 | namespace aux { | |
65 | template< typename T, T n > struct abs_wknd | |
66 | { | |
67 | BOOST_STATIC_CONSTANT(T, value = (n < 0 ? -n : n)); | |
68 | typedef integral_c<T,value> type; | |
69 | }; | |
70 | } | |
71 | #endif | |
72 | ||
73 | template<> | |
74 | struct abs_impl<integral_c_tag> | |
75 | { | |
76 | #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) | |
77 | template< typename N > struct apply | |
78 | : aux::abs_wknd< typename N::value_type, N::value > | |
79 | #else | |
80 | template< typename N > struct apply | |
81 | : integral_c< typename N::value_type, ((N::value < 0) ? (-N::value) : N::value ) > | |
82 | #endif | |
83 | { | |
84 | }; | |
85 | }; | |
86 | ||
87 | }} | |
88 | ||
89 | #endif // BOOST_MPL_ABS_HPP_INCLUDED |