CODEWITHSUNDEEP
c++c++-cli
JOE
JOE

Reputation: 373

Set a pointer to pointer in c++/cli

I have a managed class and would like to set the native class in the create() method.

ref class ManagedClass {

private:
    NativeClass* ptr = nullptr;    

public:
    void create()
    {
        NativeClass nativeClass;
        nativeClass.set(0);
        this->ptr = &nativeClass;
    }
};

However, the nativeClass is deleted when create() was run. And hence this->ptr become empty. How to make the local variable nativeClass does not be deleted?

Upvotes: 0

Views: 81

Answers (1)

dxiv
dxiv

Reputation: 17638

Local variables cease to exist when the function in which they are defined returns, and any remembered pointer to such a local variable becomes invalid. This is no different in C++/CLI vs. unmanaged C++.

To create an object that persists beyond the create call, allocate it dynamically and save a pointer to it with ptr = new NativeClass(); (then don't forget to delete ptr; when no longer needed).

Upvotes: 1

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