[lwip-devel] [bug #49827] wrong cast to size_t on 16-bit x86 architecture

[Ambroz Bizjak]

Follow-up Comment #11, bug #49827 (project lwip):

Simon,

Why do you think there is a problem? Do you get a compiler error or warning?

It is a common misconception that casting "const T *" to "T *" is invalid. But
in reality it is perfectly valid by itself. What is invalid is using the
latter to modify a pointed-too object which is read-only (e.g. a string
literal or an object declared with const; note it IS valid to modify an object
which is not read-only).

I could go quoting standards but I assume I won't change your mind that way :)
Here's a StackOverflow answer though it fouces on C++:

http://stackoverflow.com/questions/8570139/is-a-cast-from-pointer-to-const-to-pointer-to-non-const-invalid-c

It is then also obviously valid to cast the "T *" to "void *". And it should
also be perfectly valid to cast "const T *" directly to "void *".

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