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- // is_instance_of_test.cpp -- The Boost Lambda Library ------------------
- //
- // Copyright (C) 2000-2003 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
- // Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See
- // accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- // For more information, see www.boost.org
- // -----------------------------------------------------------------------
- #include <boost/test/minimal.hpp> // see "Header Implementation Option"
-
- #include "boost/lambda/detail/is_instance_of.hpp"
- #include <iostream>
- template <class T1> struct A1 {};
- template <class T1, class T2> struct A2 {};
- template <class T1, class T2, class T3> struct A3 {};
- template <class T1, class T2, class T3, class T4> struct A4 {};
-
- class B1 : public A1<int> {};
- class B2 : public A2<int,int> {};
- class B3 : public A3<int,int,int> {};
- class B4 : public A4<int,int,int,int> {};
- // classes that are convertible to classes that derive from A instances
- // This is not enough to make the test succeed
- class C1 { public: operator A1<int>() { return A1<int>(); } };
- class C2 { public: operator B2() { return B2(); } };
- class C3 { public: operator B3() { return B3(); } };
- class C4 { public: operator B4() { return B4(); } };
-
- // test that the result is really a constant
- // (in an alternative implementation, gcc 3.0.2. claimed that it was
- // a non-constant)
- template <bool b> class X {};
- // this should compile
- X<boost::lambda::is_instance_of_2<int, A2>::value> x;
- int test_main(int, char *[]) {
- using boost::lambda::is_instance_of_1;
- using boost::lambda::is_instance_of_2;
- using boost::lambda::is_instance_of_3;
- using boost::lambda::is_instance_of_4;
- BOOST_CHECK((is_instance_of_1<B1, A1>::value == true));
- BOOST_CHECK((is_instance_of_1<A1<float>, A1>::value == true));
- BOOST_CHECK((is_instance_of_1<int, A1>::value == false));
- BOOST_CHECK((is_instance_of_1<C1, A1>::value == false));
- BOOST_CHECK((is_instance_of_2<B2, A2>::value == true));
- BOOST_CHECK((is_instance_of_2<A2<int, float>, A2>::value == true));
- BOOST_CHECK((is_instance_of_2<int, A2>::value == false));
- BOOST_CHECK((is_instance_of_2<C2, A2>::value == false));
- BOOST_CHECK((is_instance_of_3<B3, A3>::value == true));
- BOOST_CHECK((is_instance_of_3<A3<int, float, char>, A3>::value == true));
- BOOST_CHECK((is_instance_of_3<int, A3>::value == false));
- BOOST_CHECK((is_instance_of_3<C3, A3>::value == false));
- BOOST_CHECK((is_instance_of_4<B4, A4>::value == true));
- BOOST_CHECK((is_instance_of_4<A4<int, float, char, double>, A4>::value == true));
- BOOST_CHECK((is_instance_of_4<int, A4>::value == false));
- BOOST_CHECK((is_instance_of_4<C4, A4>::value == false));
- return 0;
- }
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