My very simple test code

void main()
{
    struct test
    {
        int a;
    }

    int b = 1;
    test name[b];
}

doesn't compile and gives these errors:

test.d(9): Error: Integer constant expression expected instead of b
test.d(9): Error: Integer constant expression expected instead of
cast(uint)b
test.d(9): Error: Integer constant expression expected instead of
cast(uint)b
test.d(9): Error: Integer constant expression expected instead of
cast(uint)b

What am I doing wrong?

ginophi wrote:
> My very simple test code
> 
> void main()
> {
>     struct test
>     {
>         int a;
>     }
> 
>     int b = 1;
>     test name[b];
> }
> 
> doesn't compile and gives these errors:
> 
> test.d(9): Error: Integer constant expression expected instead of b
> test.d(9): Error: Integer constant expression expected instead of
> cast(uint)b
> test.d(9): Error: Integer constant expression expected instead of
> cast(uint)b
> test.d(9): Error: Integer constant expression expected instead of
> cast(uint)b
> 
> What am I doing wrong?
> 

You're not reading the error message: "Integer constant expression expected instead of b". b isn't constant, hence it doesn't work.

Either make b constant ("const int b = 1"), or use a dynamic array:

auto name = new test[b];

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Thanks for the quick reply. But I forgot to put a 'final' in there. Why would it work with 'const int b = 1;' and not 'final int b = 1;' ?

"Deewiant" <deewiant.doesnotlike.spam@gmail.com> wrote in message news:f6oqhj$rta$1@digitalmars.com...
> ginophi wrote:
> > My very simple test code
> >
> > void main()
> > {
> >     struct test
> >     {
> >         int a;
> >     }
> >
> >     int b = 1;
> >     test name[b];
> > }
> >
> > doesn't compile and gives these errors:
> >
> > test.d(9): Error: Integer constant expression expected instead of b
> > test.d(9): Error: Integer constant expression expected instead of
> > cast(uint)b
> > test.d(9): Error: Integer constant expression expected instead of
> > cast(uint)b
> > test.d(9): Error: Integer constant expression expected instead of
> > cast(uint)b
> >
> > What am I doing wrong?
> >
>
> You're not reading the error message: "Integer constant expression
expected
> instead of b". b isn't constant, hence it doesn't work.
>
> Either make b constant ("const int b = 1"), or use a dynamic array:
>
> auto name = new test[b];
>
> -- 
> Remove ".doesnotlike.spam" from the mail address.

ginophi wrote:
> Thanks for the quick reply. But I forgot to put a 'final' in there. Why would it work with 'const int b = 1;' and not 'final int b = 1;' ?
> 

Because D isn't Java.

In D 1.0, which is what you should be using, final only has a meaning regarding classes and inheritance. See "Virtual Functions" at http://www.digitalmars.com/d/1.0/function.html and "Final Classes" at http://www.digitalmars.com/d/1.0/class.html

If you care about the beta 2.0, see http://www.digitalmars.com/d/final-const-invariant.html

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Remove ".doesnotlike.spam" from the mail address.

Thanks I'll check that out


"Deewiant" <deewiant.doesnotlike.spam@gmail.com> wrote in message news:f6orl6$tm2$1@digitalmars.com...
> ginophi wrote:
> > Thanks for the quick reply. But I forgot to put a 'final' in there. Why would it work with 'const int b = 1;' and not 'final int b = 1;' ?
> >
>
> Because D isn't Java.
>
> In D 1.0, which is what you should be using, final only has a meaning
regarding
> classes and inheritance. See "Virtual Functions" at http://www.digitalmars.com/d/1.0/function.html and "Final Classes" at http://www.digitalmars.com/d/1.0/class.html
>
> If you care about the beta 2.0, see http://www.digitalmars.com/d/final-const-invariant.html
>
> -- 
> Remove ".doesnotlike.spam" from the mail address.