[373] | 1 | |
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| 2 | #include <iostream> |
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| 3 | #include "boost/shared_ptr.hpp" |
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| 4 | #include "boost/weak_ptr.hpp" |
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| 5 | |
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| 6 | class A; |
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| 7 | class B; |
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| 8 | typedef boost::shared_ptr<A> AStrongPtr; |
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| 9 | typedef boost::weak_ptr<A> AWeakPtr; |
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| 10 | typedef boost::shared_ptr<B> BStrongPtr; |
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| 11 | typedef boost::weak_ptr<B> BWeakPtr; |
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| 12 | |
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| 13 | |
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| 14 | class A { |
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| 15 | public: |
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| 16 | A() { std::cout << "Ctor A<"<<this<<">" << std::endl;} |
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| 17 | virtual ~A() { std::cout << "Dtor A<"<<this<<">" << std::endl;} |
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| 18 | |
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| 19 | A(const A& aA) : b(aA.b) {std::cout << "CCtor A<"<<this<<">" << std::endl;} |
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| 20 | A& operator=(const A& aA) { |
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| 21 | std::cout << "opr= A<"<<this<<">" << std::endl; |
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| 22 | if(&aA != this){ |
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| 23 | b = aA.b; |
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| 24 | } |
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| 25 | return *this; |
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| 26 | } |
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| 27 | |
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| 28 | void setB(const BStrongPtr& aB) {b = aB;} |
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| 29 | // BWeakPtr& getB() { |
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| 30 | // std::cout << "Use non-const getB" << std::endl; |
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| 31 | // return b; |
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| 32 | // } |
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| 33 | const BWeakPtr& getB() const { |
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| 34 | std::cout << "Use const getB" << std::endl; |
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| 35 | return b; |
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| 36 | } |
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| 37 | |
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| 38 | private: |
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| 39 | BWeakPtr b; |
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| 40 | }; |
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| 41 | |
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| 42 | class B { |
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| 43 | public: |
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| 44 | B() { std::cout << "Ctor B<"<<this<<">" << std::endl;} |
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| 45 | virtual ~B() { std::cout << "Dtor B<"<<this<<">" << std::endl;} |
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| 46 | |
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| 47 | B(const B& aB) : a(aB.a) {std::cout << "CCtor B<"<<this<<">" << std::endl;} |
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| 48 | B& operator=(const B& aB) { |
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| 49 | std::cout << "opr= B<"<<this<<">" << std::endl; |
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| 50 | if(&aB != this){ |
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| 51 | a = aB.a; |
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| 52 | } |
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| 53 | return *this; |
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| 54 | } |
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| 55 | |
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| 56 | void setA(const AStrongPtr& aA) {a = aA;} |
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| 57 | AWeakPtr& getA() { |
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| 58 | std::cout << "Use non-const getA" << std::endl; |
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| 59 | return a; |
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| 60 | } |
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| 61 | const AWeakPtr& getA() const { |
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| 62 | std::cout << "Use const getA" << std::endl; |
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| 63 | return a; |
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| 64 | } |
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| 65 | |
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| 66 | private: |
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| 67 | AWeakPtr a; |
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| 68 | }; |
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| 69 | |
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| 70 | |
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| 71 | int main() { |
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| 72 | |
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| 73 | std::cout << "Create A & B" << std::endl; |
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| 74 | AStrongPtr aA(new A); |
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| 75 | BStrongPtr aB(new B); |
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| 76 | |
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| 77 | std::cout << "Make the association A <-> B" << std::endl; |
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| 78 | aA->setB(aB); |
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| 79 | aB->setA(aA); |
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| 80 | |
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| 81 | if(BStrongPtr aB = aA->getB().lock()) { |
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| 82 | std::cout << "Use a B given by A->getB().lock() " << std::endl; |
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| 83 | } |
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| 84 | |
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| 85 | |
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| 86 | |
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| 87 | std::cout << "return" << std::endl; |
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| 88 | |
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| 89 | return 0; |
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| 90 | |
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| 91 | } |
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