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86 lines
3.1 KiB
C++
86 lines
3.1 KiB
C++
// is_instance_of_test.cpp -- The Boost Lambda Library ------------------
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//
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// Copyright (C) 2000-2003 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)
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// Copyright (C) 2000-2003 Gary Powell (powellg@amazon.com)
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//
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// Permission to copy, use, sell and distribute this software is granted
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// provided this copyright notice appears in all copies.
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// Permission to modify the code and to distribute modified code is granted
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// provided this copyright notice appears in all copies, and a notice
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// that the code was modified is included with the copyright notice.
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//
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// This software is provided "as is" without express or implied warranty,
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// and with no claim as to its suitability for any purpose.
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//
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// For more information, see www.boost.org
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// -----------------------------------------------------------------------
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#define BOOST_INCLUDE_MAIN // for testing, include rather than link
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#include <boost/test/test_tools.hpp> // see "Header Implementation Option"
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#include "boost/lambda/detail/is_instance_of.hpp"
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#include <iostream>
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template <class T1> struct A1 {};
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template <class T1, class T2> struct A2 {};
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template <class T1, class T2, class T3> struct A3 {};
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template <class T1, class T2, class T3, class T4> struct A4 {};
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class B1 : public A1<int> {};
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class B2 : public A2<int,int> {};
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class B3 : public A3<int,int,int> {};
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class B4 : public A4<int,int,int,int> {};
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// classes that are convertible to classes that derive from A instances
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// This is not enough to make the test succeed
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class C1 { public: operator A1<int>() { return A1<int>(); } };
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class C2 { public: operator B2() { return B2(); } };
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class C3 { public: operator B3() { return B3(); } };
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class C4 { public: operator B4() { return B4(); } };
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// test that the result is really a constant
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// (in an alternative implementation, gcc 3.0.2. claimed that it was
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// a non-constant)
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template <bool b> class X {};
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// this should compile
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X<boost::lambda::is_instance_of_2<int, A2>::value> x;
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int test_main(int, char *[]) {
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using boost::lambda::is_instance_of_1;
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using boost::lambda::is_instance_of_2;
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using boost::lambda::is_instance_of_3;
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using boost::lambda::is_instance_of_4;
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BOOST_TEST((is_instance_of_1<B1, A1>::value == true));
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BOOST_TEST((is_instance_of_1<A1<float>, A1>::value == true));
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BOOST_TEST((is_instance_of_1<int, A1>::value == false));
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BOOST_TEST((is_instance_of_1<C1, A1>::value == false));
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BOOST_TEST((is_instance_of_2<B2, A2>::value == true));
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BOOST_TEST((is_instance_of_2<A2<int, float>, A2>::value == true));
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BOOST_TEST((is_instance_of_2<int, A2>::value == false));
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BOOST_TEST((is_instance_of_2<C2, A2>::value == false));
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BOOST_TEST((is_instance_of_3<B3, A3>::value == true));
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BOOST_TEST((is_instance_of_3<A3<int, float, char>, A3>::value == true));
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BOOST_TEST((is_instance_of_3<int, A3>::value == false));
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BOOST_TEST((is_instance_of_3<C3, A3>::value == false));
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BOOST_TEST((is_instance_of_4<B4, A4>::value == true));
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BOOST_TEST((is_instance_of_4<A4<int, float, char, double>, A4>::value == true));
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BOOST_TEST((is_instance_of_4<int, A4>::value == false));
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BOOST_TEST((is_instance_of_4<C4, A4>::value == false));
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return 0;
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}
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