| 1 | // Boost.Function library |
|---|---|
| 2 | |
| 3 | // Copyright Douglas Gregor 2004. |
| 4 | // Copyright 2005 Peter Dimov |
| 5 | |
| 6 | // Use, modification and distribution is subject to |
| 7 | // the Boost Software License, Version 1.0. |
| 8 | // (See accompanying file LICENSE_1_0.txt or copy at |
| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
| 10 | |
| 11 | #include <boost/function.hpp> |
| 12 | #include <boost/core/lightweight_test.hpp> |
| 13 | |
| 14 | static int forty_two() |
| 15 | { |
| 16 | return 42; |
| 17 | } |
| 18 | |
| 19 | struct Seventeen |
| 20 | { |
| 21 | int operator()() const |
| 22 | { |
| 23 | return 17; |
| 24 | } |
| 25 | }; |
| 26 | |
| 27 | bool operator==(const Seventeen&, const Seventeen&) |
| 28 | { |
| 29 | return true; |
| 30 | } |
| 31 | |
| 32 | struct ReturnInt |
| 33 | { |
| 34 | explicit ReturnInt(int value) : value(value) |
| 35 | { |
| 36 | } |
| 37 | |
| 38 | int operator()() const |
| 39 | { |
| 40 | return value; |
| 41 | } |
| 42 | |
| 43 | int value; |
| 44 | }; |
| 45 | |
| 46 | bool operator==(const ReturnInt& x, const ReturnInt& y) |
| 47 | { |
| 48 | return x.value == y.value; |
| 49 | } |
| 50 | |
| 51 | bool operator!=(const ReturnInt& x, const ReturnInt& y) |
| 52 | { |
| 53 | return x.value != y.value; |
| 54 | } |
| 55 | |
| 56 | int main() |
| 57 | { |
| 58 | boost::function0<int> fn; |
| 59 | |
| 60 | fn = &forty_two; |
| 61 | |
| 62 | BOOST_TEST( fn() == 42 ); |
| 63 | |
| 64 | BOOST_TEST( fn.contains(&forty_two) ); |
| 65 | BOOST_TEST( !fn.contains( Seventeen() ) ); |
| 66 | BOOST_TEST( !fn.contains( ReturnInt(0) ) ); |
| 67 | BOOST_TEST( !fn.contains( ReturnInt(12) ) ); |
| 68 | |
| 69 | fn = Seventeen(); |
| 70 | |
| 71 | BOOST_TEST( fn() == 17 ); |
| 72 | |
| 73 | BOOST_TEST( !fn.contains( &forty_two ) ); |
| 74 | BOOST_TEST( fn.contains( Seventeen() ) ); |
| 75 | BOOST_TEST( !fn.contains( ReturnInt(0) ) ); |
| 76 | BOOST_TEST( !fn.contains( ReturnInt(12) ) ); |
| 77 | |
| 78 | fn = ReturnInt(12); |
| 79 | |
| 80 | BOOST_TEST( fn() == 12 ); |
| 81 | |
| 82 | BOOST_TEST( !fn.contains( &forty_two ) ); |
| 83 | BOOST_TEST( !fn.contains( Seventeen() ) ); |
| 84 | BOOST_TEST( !fn.contains( ReturnInt(0) ) ); |
| 85 | BOOST_TEST( fn.contains( ReturnInt(12) ) ); |
| 86 | |
| 87 | return boost::report_errors(); |
| 88 | } |
| 89 |