| 1 | // comment if you want to see the boost::move issue |
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| 2 | #define BOOST_THREAD_VERSION 3 |
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| 3 | |
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| 4 | #include <boost/type_traits/is_same.hpp> |
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| 5 | #include <boost/variant/detail/apply_visitor_binary.hpp> |
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| 6 | #include <boost/variant/static_visitor.hpp> |
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| 7 | #include <boost/variant/variant.hpp> |
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| 8 | #include <boost/smart_ptr/shared_ptr.hpp> |
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| 9 | |
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| 10 | #define WANT_BUILD_TO_FAIL |
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| 11 | #ifdef WANT_BUILD_TO_FAIL |
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| 12 | #include <boost/thread.hpp> |
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| 13 | #endif |
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| 14 | |
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| 15 | class AType |
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| 16 | { |
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| 17 | |
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| 18 | }; |
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| 19 | |
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| 20 | class BType |
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| 21 | { |
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| 22 | }; |
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| 23 | |
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| 24 | typedef boost::shared_ptr<AType> IATypePtr; |
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| 25 | typedef boost::shared_ptr<BType> IBTypePtr; |
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| 26 | |
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| 27 | typedef boost::variant<IATypePtr, IBTypePtr> ABVar; |
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| 28 | |
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| 29 | struct ServiceTimeTableEvent |
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| 30 | { |
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| 31 | public: |
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| 32 | |
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| 33 | ServiceTimeTableEvent(ABVar abType) |
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| 34 | : m_abType{ abType } |
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| 35 | {} |
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| 36 | |
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| 37 | inline ABVar const& GetABType() const { return m_abType; } |
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| 38 | inline ABVar & GetABType() { return m_abType; } |
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| 39 | |
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| 40 | private: |
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| 41 | ABVar m_abType; |
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| 42 | }; |
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| 43 | |
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| 44 | class ab_are_equals |
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| 45 | : public boost::static_visitor<bool> |
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| 46 | { |
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| 47 | public: |
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| 48 | template<typename T, typename U> |
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| 49 | bool operator()(T, U) const |
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| 50 | { |
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| 51 | return false; // cannot compare different types |
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| 52 | } |
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| 53 | template<typename T> |
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| 54 | bool operator()(T lhs, T rhs) const |
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| 55 | { |
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| 56 | return lhs == rhs; |
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| 57 | } |
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| 58 | }; |
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| 59 | |
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| 60 | int main(int argc, char* argv[]) |
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| 61 | { |
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| 62 | |
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| 63 | auto aTypePtr = IATypePtr{ new AType }; |
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| 64 | auto bTypePtr = IBTypePtr{ new BType }; |
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| 65 | |
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| 66 | ABVar aType = aTypePtr; |
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| 67 | ABVar bType = bTypePtr; |
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| 68 | |
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| 69 | ServiceTimeTableEvent timeTableEvent1{ aType }; |
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| 70 | ServiceTimeTableEvent timeTableEvent2{ bType }; |
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| 71 | |
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| 72 | auto xx = boost::apply_visitor(visitor: ab_are_equals(), visitable1&: timeTableEvent1.GetABType(), visitable2&: timeTableEvent2.GetABType()); |
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| 73 | xx = boost::apply_visitor(visitor: ab_are_equals(), visitable1&: timeTableEvent1.GetABType(), visitable2&: timeTableEvent1.GetABType());; |
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| 74 | xx = boost::apply_visitor(visitor: ab_are_equals(), visitable1&: timeTableEvent2.GetABType(), visitable2&: timeTableEvent2.GetABType());; |
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| 75 | } |
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| 76 | |
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| 77 | |
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| 78 | |
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