Code coverage doesn't work with templates. Is this by design?
t.d:
    module t;
    template t(T) {
        static if(is(T == int))
            alias int t;
        else static if(is(T == short))
            alias short t;
    }
    unittest {
        t!int a = 10;
        assert(a == 10);
    }
    void main() {}

$ dmd -unittest -cov -run t

t.lst:
       |    module t;
       |    template t(T) {
       |        static if(is(T == int))
       |            alias int t;
       |        else static if(is(T == short))
       |            alias short t;
       |    }
       |    unittest {
      1|        t!int a = 10;
      1|        assert(a == 10);
       |    }
       |    void main() {}
t.d is 100% covered

simendsjo:

> Code coverage doesn't work with templates. Is this by design?

A code coverage tells how many time a line of code is run at run-time. But your template contains no code that is run at run-time. So you are looking for a different kind of counter.

Bye,
bearophile

On Thursday, 14 March 2013 at 16:09:01 UTC, bearophile wrote:
> simendsjo:
>
>> Code coverage doesn't work with templates. Is this by design?
>
> A code coverage tells how many time a line of code is run at run-time. But your template contains no code that is run at run-time. So you are looking for a different kind of counter.

Makes sense. Would be nice to easily see that the templates are being tested more properly though.

simendsjo:

> Would be nice to easily see that the templates are being tested more properly though.

Then add an enhancement request in bugzilla. Maybe there is a way to implement it.

I remember someone asking for a compiler switch that lists all the implemented templates...

Bye,
bearophile

On Thursday, 14 March 2013 at 16:26:21 UTC, bearophile wrote:
> simendsjo:
>
>> Would be nice to easily see that the templates are being tested more properly though.
>
> Then add an enhancement request in bugzilla. Maybe there is a way to implement it.
>
> I remember someone asking for a compiler switch that lists all the implemented templates...
>
> Bye,
> bearophile

Ok: http://d.puremagic.com/issues/show_bug.cgi?id=9721