Shouldn't casting an object to void* be considered @safe?
Ola Fosheim Grøstad
ola.fosheim.grostad at gmail.com
Sun Dec 15 07:40:41 UTC 2019
On Saturday, 14 December 2019 at 23:48:38 UTC, Joseph Rushton
> ulong u = 8;
> auto v = cast(void*) u;
> ... is totally unsafe, and the compiler rightly rejects it if
> you try to do that in a code block marked @safe.
It is not type safe, but it is memory safe.
void has zero extent, so it will never be dereferenced without an
It is no different from having a pointer to a zero-length array,
or a zero-length slice. Allocators will often allocate 1 byte if
asked to allocate 0 though, to avoid such typing issues. I.e. to
allow you to obtain unique identities with zero extent.
So it is problematic, but not because of void*. It is only
problematic because other code is unsafe.
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