January 16, 2023 [Issue 23633] New: allow pure functions to call impure functions passed as parameters | ||||
---|---|---|---|---|
| ||||
https://issues.dlang.org/show_bug.cgi?id=23633 Issue ID: 23633 Summary: allow pure functions to call impure functions passed as parameters Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: enhancement Priority: P5 Component: dmd Assignee: nobody@puremagic.com Reporter: destructionator@gmail.com Basically, permit this: ``` void foo(void delegate() dg) pure { dg(); } ``` Similarly to how you can write to values passed through params, if an impure delegate is passed through params I think we can allow that as an extension of the weakly pure concept. This would allow things like passing properties to be set. If you are passed a class/interface tho, probably should only allow the pure members since that's not as explicit as the delegates. I often find myself wanting some kind of limited environment to a function, and pure ALMOST offers it, but it just isn't able to do enough since pure is too strict, this kid of relaxation just might make it work. -- |
Copyright © 1999-2021 by the D Language Foundation