On Sunday, 3 May 2015 at 17:22:00 UTC, filcuc wrote:
Hi all,
i'm working in the generation of the code but i'm failing in
extracting a function return type when invoking the
ReturnType!(T) type trait and mixing it with
__traits(getMember) function.
Can anyone help me? or explaining what is happenning?
i've created a gist here:
https://gist.github.com/filcuc/14c3a6cac89beb69cccd
The error message is the following:
main.d-mixin-58(58): Error: template instance
main.Person.ReturnType!(name) does not match template
declaration ReturnType(func...) if (func.length == 1 &&
isCallable!func)
main.d-mixin-58(58): Error: template instance
std.traits.ReturnType!(Monitor) does not match template
declaration ReturnType(func...) if (func.length == 1 &&
isCallable!func)
main.d(73): Error: template instance main.IterateUDA!(Person)
error instantiating
Try adding the following around your 'string returnType = ...'
code:
static if(isSomeFunction!(__traits(get member, T, member))
{
...
}
The problem is that you're looping over all the fields in T,
including the data members which obviously don't have a return
type. I guess ReturnType should probably use a static assert to
give a better error message.
