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- // Boost.Function library
- // Copyright Douglas Gregor 2004.
- // Copyright 2005 Peter Dimov
- // Use, modification and distribution is subject to
- // 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)
- #include <boost/function.hpp>
- #include <boost/core/lightweight_test.hpp>
- static int forty_two()
- {
- return 42;
- }
- struct Seventeen
- {
- int operator()() const
- {
- return 17;
- }
- };
- bool operator==(const Seventeen&, const Seventeen&)
- {
- return true;
- }
- struct ReturnInt
- {
- explicit ReturnInt(int value) : value(value)
- {
- }
- int operator()() const
- {
- return value;
- }
- int value;
- };
- bool operator==(const ReturnInt& x, const ReturnInt& y)
- {
- return x.value == y.value;
- }
- bool operator!=(const ReturnInt& x, const ReturnInt& y)
- {
- return x.value != y.value;
- }
- int main()
- {
- boost::function0<int> fn;
- fn = &forty_two;
- BOOST_TEST( fn() == 42 );
- BOOST_TEST( fn.contains(&forty_two) );
- BOOST_TEST( !fn.contains( Seventeen() ) );
- BOOST_TEST( !fn.contains( ReturnInt(0) ) );
- BOOST_TEST( !fn.contains( ReturnInt(12) ) );
- fn = Seventeen();
- BOOST_TEST( fn() == 17 );
- BOOST_TEST( !fn.contains( &forty_two ) );
- BOOST_TEST( fn.contains( Seventeen() ) );
- BOOST_TEST( !fn.contains( ReturnInt(0) ) );
- BOOST_TEST( !fn.contains( ReturnInt(12) ) );
- fn = ReturnInt(12);
- BOOST_TEST( fn() == 12 );
- BOOST_TEST( !fn.contains( &forty_two ) );
- BOOST_TEST( !fn.contains( Seventeen() ) );
- BOOST_TEST( !fn.contains( ReturnInt(0) ) );
- BOOST_TEST( fn.contains( ReturnInt(12) ) );
- return boost::report_errors();
- }
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