On Wed, 26 Jan 2011 12:27:37 -0500, spir <denis.s...@gmail.com> wrote:
Hello,
This fails:
class T0 {}
class T1 : T0 {}
class T2 : T0 {}
unittest {
auto t1 = new T1();
auto t2 = new T2();
T0[] ts = [t1, t2];
}
Error: cannot implicitly convert expression (t1) of type __trials__.T0
to __trials__.T2
Error: cannot implicitly convert expression ([(__error),t2]) of type
T2[] to T0[]
I guess it should be accepted due to explicite typing 'T0[]'. What do
you think? D first determines the type of the last element (always the
last one), here T2. Then, /ignoring/ the array's defined type, tries to
cast other elements to the same type T2. It should instead, I guess,
check all elements are compatible with the defined array type.
An additional enigma is why the failing element t1 is said to be of
supertype T0 --which is also correct-- while it retained t2's exact type
T2. ???
Anyway, is there a workaround?
auto ts = cast(T0[])[t1, t2];
-Steve
