https://d.puremagic.com/issues/show_bug.cgi?id=11936
Summary: Allow non-`ref` parameters in `foreach` over range
`delegate`/`opApply`
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Denis Shelomovskij <[email protected]> 2014-01-16
12:05:21 MSK ---
Test code:
---
void main()
{
int delegate(int delegate(int)) dg1; // currently unforeachable
int delegate(int delegate(ref int)) dg2;
static assert( __traits(compiles, { foreach( a; dg1) { } })); // fails
static assert(!__traits(compiles, { foreach(ref a; dg1) { } }));
static assert( __traits(compiles, { foreach(ref a; dg2) { } }));
}
---
As some parameters may represent e.g. temporary values it's useful to show it
disallowing `ref` on them.
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