https://d.puremagic.com/issues/show_bug.cgi?id=11588
Summary: Inconsistent abilities to compare `const`/`immutable`
classes
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Denis Shelomovskij <[email protected]> 2013-11-24
11:50:11 MSK ---
Currently because of Issue 1824 `opEquals` and `opCmp` aren't `const`.
dmd rejects `opCmp` calls but accepts `opEquals` ones:
---
class C
{
int i;
override bool opEquals(Object o) { ++i; return true;}
override int opCmp(Object c) { ++i; return 0; }
}
void main()
{
const c1 = new C, c2 = new C;
assert(c1 == c2); // ok, calls `opEquals`
assert(c1 <= c2); // Error: mutable method main.C.opCmp is not callable
using a const object
}
---
Both should be either accepted or rejected. See Issue 11557 for proposal to
allow `opCmp` calls too.
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