|
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: negate.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
|
14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
|
15 // $Revision: 49267 $ |
|
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 |