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1 | |
2 | #ifndef BOOST_MPL_NEGATE_HPP_INCLUDED | |
3 | #define BOOST_MPL_NEGATE_HPP_INCLUDED | |
4 | ||
5 | // Copyright Aleksey Gurtovoy 2000-2004 | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. | |
8 | // (See accompanying file LICENSE_1_0.txt or copy at | |
9 | // http://www.boost.org/LICENSE_1_0.txt) | |
10 | // | |
11 | // See http://www.boost.org/libs/mpl for documentation. | |
12 | ||
13 | // $Id$ | |
14 | // $Date$ | |
15 | // $Revision$ | |
16 | ||
17 | #include <boost/mpl/integral_c.hpp> | |
18 | #include <boost/mpl/aux_/msvc_eti_base.hpp> | |
19 | #include <boost/mpl/aux_/na_spec.hpp> | |
20 | #include <boost/mpl/aux_/lambda_support.hpp> | |
21 | #include <boost/mpl/aux_/config/eti.hpp> | |
22 | #include <boost/mpl/aux_/config/integral.hpp> | |
23 | #include <boost/mpl/aux_/config/static_constant.hpp> | |
24 | ||
25 | namespace boost { namespace mpl { | |
26 | ||
27 | template< typename Tag > struct negate_impl; | |
28 | ||
29 | template< typename T > struct negate_tag | |
30 | { | |
31 | typedef typename T::tag type; | |
32 | }; | |
33 | ||
34 | template< | |
35 | typename BOOST_MPL_AUX_NA_PARAM(N) | |
36 | > | |
37 | struct negate | |
38 | #if !defined(BOOST_MPL_CFG_MSVC_ETI_BUG) | |
39 | : negate_impl< | |
40 | typename negate_tag<N>::type | |
41 | >::template apply<N>::type | |
42 | #else | |
43 | : aux::msvc_eti_base< typename apply_wrap1< | |
44 | negate_impl< typename negate_tag<N>::type > | |
45 | , N | |
46 | >::type >::type | |
47 | #endif | |
48 | { | |
49 | BOOST_MPL_AUX_LAMBDA_SUPPORT(1, negate, (N)) | |
50 | }; | |
51 | ||
52 | BOOST_MPL_AUX_NA_SPEC(1, negate) | |
53 | ||
54 | ||
55 | #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC) | |
56 | namespace aux { | |
57 | template< typename T, T n > struct negate_wknd | |
58 | { | |
59 | BOOST_STATIC_CONSTANT(T, value = -n); | |
60 | typedef integral_c<T,value> type; | |
61 | }; | |
62 | } | |
63 | #endif | |
64 | ||
65 | template<> | |
66 | struct negate_impl<integral_c_tag> | |
67 | { | |
68 | #if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC) | |
69 | template< typename N > struct apply | |
70 | : aux::negate_wknd< typename N::value_type, N::value > | |
71 | #else | |
72 | template< typename N > struct apply | |
73 | : integral_c< typename N::value_type, (-N::value) > | |
74 | #endif | |
75 | { | |
76 | }; | |
77 | }; | |
78 | ||
79 | }} | |
80 | ||
81 | #endif // BOOST_MPL_NEGATE_HPP_INCLUDED |