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
23template <class T1> struct A1 {};
24template <class T1, class T2> struct A2 {};
25template <class T1, class T2, class T3> struct A3 {};
26template <class T1, class T2, class T3, class T4> struct A4 {};
27
28class B1 : public A1<int> {};
29class B2 : public A2<int,int> {};
30class B3 : public A3<int,int,int> {};
31class 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
36class C1 { public: operator A1<int>() { return A1<int>(); } };
37class C2 { public: operator B2() { return B2(); } };
38class C3 { public: operator B3() { return B3(); } };
39class 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)
44template <bool b> class X {};
45// this should compile
46X<boost::lambda::is_instance_of_2<int, A2>::value> x;
47
48
49int main() {
50
51using boost::lambda::is_instance_of_1;
52using boost::lambda::is_instance_of_2;
53using boost::lambda::is_instance_of_3;
54using boost::lambda::is_instance_of_4;
55
56
57BOOST_CHECK((is_instance_of_1<B1, A1>::value == true));
58BOOST_CHECK((is_instance_of_1<A1<float>, A1>::value == true));
59BOOST_CHECK((is_instance_of_1<int, A1>::value == false));
60BOOST_CHECK((is_instance_of_1<C1, A1>::value == false));
61
62BOOST_CHECK((is_instance_of_2<B2, A2>::value == true));
63BOOST_CHECK((is_instance_of_2<A2<int, float>, A2>::value == true));
64BOOST_CHECK((is_instance_of_2<int, A2>::value == false));
65BOOST_CHECK((is_instance_of_2<C2, A2>::value == false));
66
67BOOST_CHECK((is_instance_of_3<B3, A3>::value == true));
68BOOST_CHECK((is_instance_of_3<A3<int, float, char>, A3>::value == true));
69BOOST_CHECK((is_instance_of_3<int, A3>::value == false));
70BOOST_CHECK((is_instance_of_3<C3, A3>::value == false));
71
72BOOST_CHECK((is_instance_of_4<B4, A4>::value == true));
73BOOST_CHECK((is_instance_of_4<A4<int, float, char, double>, A4>::value == true));
74BOOST_CHECK((is_instance_of_4<int, A4>::value == false));
75BOOST_CHECK((is_instance_of_4<C4, A4>::value == false));
76
77return boost::report_errors();
78
79}
80

source code of boost/libs/lambda/test/is_instance_of_test.cpp