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Bug 1717 – Template class with opAssign should be nullable

Status: RESOLVED
Resolution: WONTFIX
Severity: normal
Priority: P2
Component: dmd
Product: D
Version: D1 (retired)
Platform: x86
OS: Windows
Creation time: 2007-12-07T22:50:00Z
Last change time: 2014-02-24T15:32:16Z
Keywords: rejects-valid
Assigned to: bugzilla
Creator: vertex

Comments

Comment #0 by vertex — 2007-12-07T22:50:09Z

class Foo(T) { T opAssign(T v) { return v; } } void main() { auto foo = new Foo!(float)(); foo = cast(Foo!(float))null; // Works foo = null; // Error: Can't convert null to float } DMD should not try to implicitly cast null to template type, but set the reference to null instead.

Comment #1 by bugzilla — 2008-01-18T12:21:36Z

This is (one reason) why opAssign for classes is getting dropped in D 2.0.