1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // noinvoke.hpp |
3 | // |
4 | // Copyright 2008 Eric Niebler. Distributed under the Boost |
5 | // Software License, Version 1.0. (See accompanying file |
6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
7 | |
8 | #include <boost/proto/core.hpp> |
9 | #include <boost/proto/transform/make.hpp> |
10 | #include <boost/type_traits/add_pointer.hpp> |
11 | #include <boost/type_traits/remove_pointer.hpp> |
12 | #include <boost/test/unit_test.hpp> |
13 | namespace proto=boost::proto; |
14 | using proto::_; |
15 | |
16 | struct Test |
17 | : proto::when< |
18 | _ |
19 | , proto::noinvoke< |
20 | // This remove_pointer invocation is bloked by noinvoke |
21 | boost::remove_pointer< |
22 | // This add_pointer invocation is *not* blocked by noinvoke |
23 | boost::add_pointer<_> |
24 | > |
25 | >() |
26 | > |
27 | {}; |
28 | |
29 | struct Test2 |
30 | : proto::when< |
31 | _ |
32 | // This add_pointer gets invoked because a substitution takes place |
33 | // within it. |
34 | , boost::add_pointer< |
35 | proto::noinvoke< |
36 | // This remove_pointer invocation is bloked by noinvoke |
37 | boost::remove_pointer< |
38 | // This add_pointer invocation is *not* blocked by noinvoke |
39 | boost::add_pointer<_> |
40 | > |
41 | > |
42 | >() |
43 | > |
44 | {}; |
45 | |
46 | template<typename T, typename U> |
47 | struct select2nd |
48 | { |
49 | typedef U type; |
50 | }; |
51 | |
52 | struct Test3 |
53 | : proto::when< |
54 | _ |
55 | // This add_pointer gets invoked because a substitution takes place |
56 | // within it. |
57 | , select2nd< |
58 | void |
59 | , proto::noinvoke< |
60 | // This remove_pointer invocation is bloked by noinvoke |
61 | select2nd< |
62 | void |
63 | // This add_pointer invocation is *not* blocked by noinvoke |
64 | , boost::add_pointer<_> |
65 | > |
66 | > |
67 | >() |
68 | > |
69 | {}; |
70 | |
71 | |
72 | void test_noinvoke() |
73 | { |
74 | typedef proto::terminal<int>::type Int; |
75 | Int i = {.child0: 42}; |
76 | |
77 | BOOST_MPL_ASSERT(( |
78 | boost::is_same< |
79 | boost::result_of<Test(Int)>::type |
80 | , boost::remove_pointer<Int *> |
81 | > |
82 | )); |
83 | |
84 | boost::remove_pointer<Int *> t = Test()(i); |
85 | |
86 | BOOST_MPL_ASSERT(( |
87 | boost::is_same< |
88 | boost::result_of<Test2(Int)>::type |
89 | , boost::remove_pointer<Int *> * |
90 | > |
91 | )); |
92 | |
93 | boost::remove_pointer<Int *> * t2 = Test2()(i); |
94 | |
95 | BOOST_MPL_ASSERT(( |
96 | boost::is_same< |
97 | boost::result_of<Test3(Int)>::type |
98 | , select2nd<void, Int *> |
99 | > |
100 | )); |
101 | |
102 | select2nd<void, Int *> t3 = Test3()(i); |
103 | } |
104 | |
105 | using namespace boost::unit_test; |
106 | /////////////////////////////////////////////////////////////////////////////// |
107 | // init_unit_test_suite |
108 | // |
109 | test_suite* init_unit_test_suite( int argc, char* argv[] ) |
110 | { |
111 | test_suite *test = BOOST_TEST_SUITE("test proto::noinvoke" ); |
112 | |
113 | test->add(BOOST_TEST_CASE(&test_noinvoke)); |
114 | |
115 | return test; |
116 | } |
117 | |