On Monday, 5 March 2018 at 10:57:35 UTC, Jonathan M Davis wrote:
Here's something I wrote up on const:
/snip
May be not entirely related, but a little gotcha.
given:
interface XY {}
class Foo: XY {}
class Bar: XY {}
void doSomething(in XY sth)
{
auto foo = cast(Foo)sth; // error in @safe code
}
But the compiler doesn't emit a warning that const got cast away
in @system code.
Since @system is the default setting and casting const away is by
definition undefined behavior, there should be some feedback.
If you cast away const in C++ you need to be explicit about it by
using const_cast, documents the intention rather than D's
swiss-army-cast.
