On Wednesday, 18 January 2017 at 15:29:43 UTC, Mark wrote:
On Tuesday, 17 January 2017 at 15:59:26 UTC, Andrei Alexandrescu wrote:
On 1/17/17 12:08 PM, Mark wrote:
On Tuesday, 17 January 2017 at 09:17:56 UTC, Andrei Alexandrescu wrote:

Given that D supports class invariants, is there a real need for
predicated setters?

The invariant is evaluated after the setter has taken place, i.e. after the object has been corrupted. The setter guard prevents corruption from happening. -- Andrei

I see. Is there a way to call invariant() of a class/struct directly? That would obviate the need for a particular predicate (copy the class state, run the setter, check if invariants are satisfied and restore previous state if they aren't).

You can call invariant directly with `assert(this);` IIRC.

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