41 lines
720 B
C++
41 lines
720 B
C++
#include <memory>
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#include <stdio.h>
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class C2{
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public:
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int data=4;
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~C2(){
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printf("C2 destroyed\n");
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}
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};
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class C1{
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public:
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~C1(){
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printf("C1 destroyed\n");
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}
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void PrintData(std::weak_ptr<C2>ptr) {
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printf("Data is %d\n",ptr.lock()->data);
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}
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};
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int main(){
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std::shared_ptr<C1> ptrA{std::make_shared<C1>()};
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std::weak_ptr<C1>ptrA_2=ptrA;
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if (!ptrA_2.expired()) {
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printf("Count:%ld",ptrA.use_count());
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std::shared_ptr<C1> ptrA_3{ptrA};
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printf("Inside if statement.\n");
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std::shared_ptr<C2> ptrB{std::make_shared<C2>()};
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ptrA_2.lock()->PrintData(ptrB);
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printf("Count:%ld",ptrA.use_count());
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}
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printf("Count:%ld",ptrA.use_count());
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printf("Outside if statement.\n");
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return -1;
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}
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