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Learn Circular References and Shared Pointers | Shared Pointers
C++ Smart Pointers

bookCircular References and Shared Pointers

When working with std::shared_ptr, you might encounter an issue known as a circular reference. A circular reference occurs when two objects hold shared_ptr references to each other. Since shared_ptr uses reference counting, the count never reaches zero, causing a memory leak.

main.cpp

main.cpp

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#include <iostream> #include <memory> class B; // Forward declaration class A { public: std::shared_ptr<B> p_b; ~A() { std::cout << "A destroyed\n"; } }; class B { public: ~B() { std::cout << "B destroyed\n"; } std::shared_ptr<A> p_a; }; int main() { std::shared_ptr<A> a = std::make_shared<A>(); std::shared_ptr<B> b = std::make_shared<B>(); a->p_b = b; b->p_a = a; }

There is a way to fix this issue you need to use a different type of smart pointer.

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What problem does a circular reference cause in std::shared_ptr?

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SectionΒ 3. ChapterΒ 3

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bookCircular References and Shared Pointers

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When working with std::shared_ptr, you might encounter an issue known as a circular reference. A circular reference occurs when two objects hold shared_ptr references to each other. Since shared_ptr uses reference counting, the count never reaches zero, causing a memory leak.

main.cpp

main.cpp

copy
1234567891011121314151617181920212223242526
#include <iostream> #include <memory> class B; // Forward declaration class A { public: std::shared_ptr<B> p_b; ~A() { std::cout << "A destroyed\n"; } }; class B { public: ~B() { std::cout << "B destroyed\n"; } std::shared_ptr<A> p_a; }; int main() { std::shared_ptr<A> a = std::make_shared<A>(); std::shared_ptr<B> b = std::make_shared<B>(); a->p_b = b; b->p_a = a; }

There is a way to fix this issue you need to use a different type of smart pointer.

question mark

What problem does a circular reference cause in std::shared_ptr?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 3
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