On 12/14/2016 04:02 AM, Ali wrote:
> On Tuesday, 13 December 2016 at 23:29:31 UTC, Ali Çehreli wrote:
>> On 12/13/2016 01:36 PM, Ali wrote:
>>
>>> Now about that second part of my problem ....
>>
>> I'm not entirely sure whether this should work but I think the problem
>> is with mutating the 'frequencies' member of an immutable element of
>> 'rooms'. The error message means that those non-const expressions
>> cannot be shared by a member of an immutable AA.
>
> I'm not sure I fully follow here. Because the variable in the parse
> function is not immutable and the frequencies member is not "created"
> yet, so to say. So after I create the frequencies object, I assign it to
> the member of a Room object. The following illustrates this more clearly
> I think:
>
> struct A { int x; }
> struct B { int[char] x; }
> auto f1() {
> int x;
> x = 3;
> return A(x);
> }
>
> auto f2() {
> int[char] x;
> x['A'] = 2;
> return B(x);
> }
>
> static immutable a = f1();
> static immutable b = f2();
>
> pragma(msg, a);
> pragma(msg, b);
>
> This fails to compile with "Error: non-constant expression ['A':2]".
> But, the pragma(msg) prints out the correct information for both a and b.
Yeah, I think the compiler is confused because the function is called in
a non-const context during the initialization of an immutable object.
I would open an issue:
https://issues.dlang.org/enter_bug.cgi?product=D
Ali
