On Thu, Aug 28, 2014 at 05:22:42PM -0700, Timothy Gu wrote: > On Aug 28, 2014 6:14 AM, "Michael Niedermayer" <michae...@gmx.at> wrote: > > > > buf is assigned to AVIOContext.buffer, which is written to by some > > functions using AVIOContext > > Doesn't const only apply to this particular function? In other words, > doesn't const only guarantee that it is not changed inside this particular > function?
if the function has a access to a non const version of the pointer
it very well can change its content like in func(dst, dst); where one
is const and the other is not
but
from the link below
"From the C99 specs (6.7.3 Type qualifiers):
If an attempt is made to modify an object defined with a const-qualified
type through use of an lvalue with non-const-qualified type, the behavior is
undefined.
"
from
http://stackoverflow.com/questions/8836418/is-const-casting-via-a-union-undefined-behaviour
(maybe not the clearest and best reference to it but thats what i
found)
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
It is dangerous to be right in matters on which the established authorities
are wrong. -- Voltaire
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