std :: make_shared <Type> 造成内存泄漏

Question

Valgrind gives me some memory leaks when I use std::make_shared:

TEST_F(CTestChild, add_gran_child) {
    auto child{ std::make_shared<CChild>(TType::Home, std::make_shared<CMockParent>()) };
    NiceMock<CMockCaller> caller;
    auto gran_child( std::make_shared<CMockGranChild>(TType::Girl, child, caller) );
    child->Add(gran_child);
    EXPECT_EQ(child->GetCount(), 1);
}

class CMockParent : CParent{
public:
    void something(void) override {}
}

class CParent{
public:
    virtual void something(void) = 0;
}

class CChild{
public:
    CChild(TType, shared_ptr<CParent> a) : _parent(a) {}
    void Add(shared_ptr<CGranChild> a) { _list.push_back(a) }
    shared_ptr<CParent> _parent;
    TList<shared_ptr<CGranChild>> _list;
}

class CGranChild{
public:
    CGranChild(TType, shared_ptr<CChild> a) : i_parent(a) {}
    shared_ptr<CChild> _parent;
}

Why is make_shared giving me a memory leak?

Edit: I have included the summary of the classes for better understanding of the code.

Answer 1

you have 2 shared pointers owning each other.

think of a clear ownership concept. then store a std::weak_ptr in the non-owner. To access the non-owned object .lock() the weak_ptr and check the resulting shared_ptr before use.