1 | // is_instance_of_test.cpp -- The Boost Lambda Library ------------------ |
2 | // |
3 | // Copyright (C) 2000-2003 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi) |
4 | // Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com) |
5 | // |
6 | // Distributed under the Boost Software License, Version 1.0. (See |
7 | // accompanying file LICENSE_1_0.txt or copy at |
8 | // http://www.boost.org/LICENSE_1_0.txt) |
9 | // |
10 | // For more information, see www.boost.org |
11 | |
12 | // ----------------------------------------------------------------------- |
13 | |
14 | |
15 | #include <boost/core/lightweight_test.hpp> |
16 | #define BOOST_CHECK BOOST_TEST |
17 | |
18 | |
19 | #include "boost/lambda/detail/is_instance_of.hpp" |
20 | |
21 | #include <iostream> |
22 | |
23 | template <class T1> struct A1 {}; |
24 | template <class T1, class T2> struct A2 {}; |
25 | template <class T1, class T2, class T3> struct A3 {}; |
26 | template <class T1, class T2, class T3, class T4> struct A4 {}; |
27 | |
28 | class B1 : public A1<int> {}; |
29 | class B2 : public A2<int,int> {}; |
30 | class B3 : public A3<int,int,int> {}; |
31 | class B4 : public A4<int,int,int,int> {}; |
32 | |
33 | // classes that are convertible to classes that derive from A instances |
34 | // This is not enough to make the test succeed |
35 | |
36 | class C1 { public: operator A1<int>() { return A1<int>(); } }; |
37 | class C2 { public: operator B2() { return B2(); } }; |
38 | class C3 { public: operator B3() { return B3(); } }; |
39 | class C4 { public: operator B4() { return B4(); } }; |
40 | |
41 | // test that the result is really a constant |
42 | // (in an alternative implementation, gcc 3.0.2. claimed that it was |
43 | // a non-constant) |
44 | template <bool b> class X {}; |
45 | // this should compile |
46 | X<boost::lambda::is_instance_of_2<int, A2>::value> x; |
47 | |
48 | |
49 | int main() { |
50 | |
51 | using boost::lambda::is_instance_of_1; |
52 | using boost::lambda::is_instance_of_2; |
53 | using boost::lambda::is_instance_of_3; |
54 | using boost::lambda::is_instance_of_4; |
55 | |
56 | |
57 | BOOST_CHECK((is_instance_of_1<B1, A1>::value == true)); |
58 | BOOST_CHECK((is_instance_of_1<A1<float>, A1>::value == true)); |
59 | BOOST_CHECK((is_instance_of_1<int, A1>::value == false)); |
60 | BOOST_CHECK((is_instance_of_1<C1, A1>::value == false)); |
61 | |
62 | BOOST_CHECK((is_instance_of_2<B2, A2>::value == true)); |
63 | BOOST_CHECK((is_instance_of_2<A2<int, float>, A2>::value == true)); |
64 | BOOST_CHECK((is_instance_of_2<int, A2>::value == false)); |
65 | BOOST_CHECK((is_instance_of_2<C2, A2>::value == false)); |
66 | |
67 | BOOST_CHECK((is_instance_of_3<B3, A3>::value == true)); |
68 | BOOST_CHECK((is_instance_of_3<A3<int, float, char>, A3>::value == true)); |
69 | BOOST_CHECK((is_instance_of_3<int, A3>::value == false)); |
70 | BOOST_CHECK((is_instance_of_3<C3, A3>::value == false)); |
71 | |
72 | BOOST_CHECK((is_instance_of_4<B4, A4>::value == true)); |
73 | BOOST_CHECK((is_instance_of_4<A4<int, float, char, double>, A4>::value == true)); |
74 | BOOST_CHECK((is_instance_of_4<int, A4>::value == false)); |
75 | BOOST_CHECK((is_instance_of_4<C4, A4>::value == false)); |
76 | |
77 | return boost::report_errors(); |
78 | |
79 | } |
80 | |