http://d.puremagic.com/issues/show_bug.cgi?id=6316
Summary: Class downcast is rejected in @safe code
Product: D
Version: D2
Platform: x86
OS/Version: Mac OS X
Status: NEW
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nob...@puremagic.com
ReportedBy: htven...@gmail.com
--- Comment #0 from Harry Vennik <htven...@gmail.com> 2011-07-14 06:30:27 PDT
---
The D language specification does not forbid downcasting in @safe code, but the
compiler rejects it. Downcasting is actually safe because such casts are
checked run-time.
The minimal testcase is:
------- CODE -------
class A { }
class B : A { }
@safe void main()
{
A a = new A();
B b = cast(B) a;
}
----- END CODE -----
The above code is rejected by the compiler with the following message:
safe_downcast.d(7): Error: cast from safe_downcast.A to safe_downcast.B not
allowed in safe code
Possible enhancement: make DMD issue a warning if the result of a downcast is
not checked for null.
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