Luis Angel Fernandez Fernandez wrote:
> why this code works?
>
> #include <iostream>
>
> class A {
> public:
> void foo() {std::cout << "hi" << std::endl; };
> };
>
> void MakeA(A *pA) { pA = new A; }
>
> int main() {
> A* pA = NULL;
> Make(pA);
> pA->foo();
> delete pA;
>
> return 0;
> }
>
> And... why ((A*)NULL)->foo() works too?

The code has undefined behaviour (UB). One of the results of UB
is the appearance of being "working". Read up on UB and don't
write code like that.

V
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