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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