shared_ptr as class member corrupts stack?

I have a shared_ptr开发者_如何学运维 in the class like this

class App
{
public:
    App(){};
    ~App(){};

private:

    boost::shared_ptr<int> ab;
};

when I instanciate one App class in main, the stack gets corrupted?

int main(){
   App myApp;
}

Does any one know why the error :" Run-Time Check Failure #2 - Stack around the variable 'myApp' was corrupted." appears, in Visual Studio?

shared_ptr needs no initialization it will be zero anyway or not? This is quite strange

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The code you pasted is fine, shared_ptr has a sensible default ctor and will destruct fine