On 01/26/2011 06:27 PM, spir 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?
PS: this works, but I would prefere a solution with all casting:
T0[] ts = [cast(T0)t1, cast(T0)t2];
I consider this issue a bug, at least when the array is explicitely typed. What
do you think?
Denis
--
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vita es estrany
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