Joe Orton wrote:
On Fri, Feb 06, 2004 at 10:06:14AM +0000, Ben Laurie wrote:
Surely the point is that the function and the function pointer actually
_do_ have compatible types, but we hold the pointer in a variable that
doesn't. That is, we cast it to an incompatible type for storage, then
cast it back.
The issue is the call to apr_dynamic_fn_register, here's how I read it:
(((void (*)(const char *, APR_OPTIONAL_FN_TYPE(name) *))
&apr_dynamic_fn_register)(#name,name))
this takes a function pointer (&apr_dynamic_fn_register), then casts it
to a different type (void (*)(const blah blah)), then calls the function
using this type. That has undefined behaviour, since the type of
apr_dynamic_fn_register is not compatible with the (void (*)(const blah
blah) type.
I misunderstood, sorry.
Cheers,
Ben.
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