|
1 |
|
2 #ifndef BOOST_MPL_EVAL_IF_HPP_INCLUDED |
|
3 #define BOOST_MPL_EVAL_IF_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 // $Source: /cvsroot/boost/boost/boost/mpl/eval_if.hpp,v $ |
|
14 // $Date: 2004/11/28 01:54:10 $ |
|
15 // $Revision: 1.3 $ |
|
16 |
|
17 #include <boost/mpl/if.hpp> |
|
18 #include <boost/mpl/aux_/na_spec.hpp> |
|
19 #include <boost/mpl/aux_/lambda_support.hpp> |
|
20 #include <boost/mpl/aux_/config/msvc.hpp> |
|
21 #include <boost/mpl/aux_/config/gcc.hpp> |
|
22 #include <boost/mpl/aux_/config/workaround.hpp> |
|
23 |
|
24 namespace boost { namespace mpl { |
|
25 |
|
26 template< |
|
27 typename BOOST_MPL_AUX_NA_PARAM(C) |
|
28 , typename BOOST_MPL_AUX_NA_PARAM(F1) |
|
29 , typename BOOST_MPL_AUX_NA_PARAM(F2) |
|
30 > |
|
31 struct eval_if |
|
32 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \ |
|
33 || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \ |
|
34 && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \ |
|
35 ) |
|
36 { |
|
37 typedef typename if_<C,F1,F2>::type f_; |
|
38 typedef typename f_::type type; |
|
39 #else |
|
40 : if_<C,F1,F2>::type |
|
41 { |
|
42 #endif |
|
43 BOOST_MPL_AUX_LAMBDA_SUPPORT(3,eval_if,(C,F1,F2)) |
|
44 }; |
|
45 |
|
46 // (almost) copy & paste in order to save one more |
|
47 // recursively nested template instantiation to user |
|
48 template< |
|
49 bool C |
|
50 , typename F1 |
|
51 , typename F2 |
|
52 > |
|
53 struct eval_if_c |
|
54 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \ |
|
55 || ( BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, >= 0x0300) \ |
|
56 && BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0304)) \ |
|
57 ) |
|
58 { |
|
59 typedef typename if_c<C,F1,F2>::type f_; |
|
60 typedef typename f_::type type; |
|
61 #else |
|
62 : if_c<C,F1,F2>::type |
|
63 { |
|
64 #endif |
|
65 }; |
|
66 |
|
67 BOOST_MPL_AUX_NA_SPEC(3, eval_if) |
|
68 |
|
69 }} |
|
70 |
|
71 #endif // BOOST_MPL_EVAL_IF_HPP_INCLUDED |