[OT] Can global variable be passed into Python function?
rosuav at gmail.com
Sun Mar 2 05:17:21 CET 2014
On Sun, Mar 2, 2014 at 3:02 PM, Dave Angel <davea at davea.name> wrote:
> The quote you make from the C standard doesn't mention malloc, so
> you're arguing different things. It's not the compiler that casts
> the malloc return value to the struct type.
> C++ does implicitly convert the result, and the return value of
> new already has the struct type. But the runtime stores at least
> two kinds of overhead on occasion, the array size, and the
> vtable. So the malloc address can not be assumed to match the
> struct beginning. (Not even considering that one can override
Whatever pointer malloc returns is the beginning of the *usable*
space. Any overhead for array size etc has to be before that; a
virtual function table pointer would be inside that space, but that's
very much compiler-dependent.
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