Re: Bug in using string mixins inside of a struct?

[Timon Gehr]

On 03/26/2013 10:28 PM, Joseph Cassman wrote:

I get these errors

aggregate.d(11): Error: variable aggregate.A.c!("y").c cannot use
template to add field to aggregate 'A'
aggregate.d(6): Error: template instance aggregate.A.c!("y") error
instantiating

from compiling the following code

struct A
{
     void b()
     {
         size_t y;
         mixin(c!("y"));
     }

     template c(string x)
     {
         const char[] c = "
             while(" ~ x ~ " < 100)
             {
                 " ~ x ~ "++;
             }";
     }
}

I can only find bug 276
(http://d.puremagic.com/issues/show_bug.cgi?id=276) which seems related
but looks like it was fixed.

I am using dmd 2.062 on Ubuntu Linux 12.10.

Is this a bug? Or maybe bad code?

Bad code. Use enum for compile-time constants.

This will work:

struct A{
    void b(){
        size_t y;
        mixin(c!("y"));
    }

    template c(string x){
        enum c = "while(" ~ x ~ " < 100){" ~ x ~ "++;}";
    }
}