Re: Using swap idiom for exception safety in a constructor

Hi, I want to ensure exception safety inside a constructor by creating a temporary object and then swapping it with *this:

class Test {
public:
    Test(int value) : p(0)
    {
        Test tmp;
        tmp.initialize(value); // In case of exception, tmp is destroyed
        swap(tmp);
    }

    ~Test()
    {
        if (p) delete p;
    };

    swap(Test& other) {...}

private:
    Test() : p(0) {}
    
    void initialize(int value)
    {
       p = new X(value, ...);
       // and more members...
    }

private:
    X * p;
    // And many more members...
};

I wanted to know:
a) Is this a common approach?
b) What other options do you recommend when this is not possible (e.g. Test has pure-virtual methods so I can't instantiate the tmp object)?

Thanks