Making RCSlice and DIP74 work with const and immutable
Zach the Mystic via Digitalmars-d
digitalmars-d at puremagic.com
Sun Mar 1 10:01:18 PST 2015
On Sunday, 1 March 2015 at 16:45:04 UTC, Zach the Mystic wrote:
> On Sunday, 1 March 2015 at 01:40:40 UTC, Andrei Alexandrescu
>> One possible solution is to add a "@mutable" or "@metadata"
>> attribute similar to C++'s keyword "mutable". Walter and I
>> both dislike that solution because it's hamfisted and leaves
>> too much opportunity for abuse - people can essentially create
>> unbounded amounts of mutable payload for an object claimed to
>> be immutable. That makes it impossible (or unsafe) to optimize
>> code based on algebraic assumptions.
> I need to get educated on this issue. First suggestion: Just
> break the type system by encouraging the idiom of using casts
> in opAddRef and opRelease. It's too easy, but I don't know why.
Well I guess it's about optimizing code. So the question is what
the optimizer needs to know, and why.
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