I heard that NULL is equivalent to .net nullptr and that 0 is not equivalent to .net nullptr. why? I thought that NULL is a macro equal to 0 ?
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I depends on if you're talking about unmanaged pointers or managed handles. Regarding pointers, a quote from the documentation here:
The following sample shows that nullptr and zero can be used interchangeably on native pointers.
However, if you're talking about a managed handle, then you can't use 0 as described in this quote from the same page:
You cannot initialize a handle to zero; only nullptr can be used. Assignment of constant 0 to an object handle produces a boxed Int32 and a cast to Object^.