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Bug 21608 – [betterC] static slices are allowed and have the wrong size

Status: RESOLVED
Resolution: INVALID
Severity: normal
Priority: P1
Component: dmd
Product: D
Version: D2
Platform: All
OS: Linux
Creation time: 2021-02-03T21:04:31Z
Last change time: 2021-02-04T00:15:22Z
Assigned to: No Owner
Creator: LucienPe

Comments

Comment #0 by lucien.perregaux — 2021-02-03T21:04:31Z

Pretty much the title. Slices uses TypeInfo, which should be disallowed in betterC mode. --- import core.stdc.stdio; extern(C) void main() { static int[] a = [ 1, 2, 3, 4, 5, 6 ]; // Shouldn't be allowed printf("%lli", a.sizeof); // prints 16 instead of 24 } ---

Comment #1 by kinke — 2021-02-03T22:39:41Z

A slice is a fat pointer, nothing more. So no direct dependency on TypeInfos and no reason to disallow them for -betterC.

Comment #2 by moonlightsentinel — 2021-02-04T00:15:22Z

Also, sizeof returns the size of the pointer + length, not the actual array.