On 2013-01-06 14:29, Philippe Sigaud wrote:
Don't know if this is what you want but:
struct Marked {}
struct Attrs (T...) {}
auto bar ()
{
@Marked int i;
return Attrs!(__traits(getAttributes, i))();
}
void main ()
{
writeln(bar()); // prints Attrs!(Marked)()
}
I just want to be able to return an attributed something. How can a
function return something that's attributed?
IIUC what Walter said, a function cannot return an attributed value: any
internal symbol can be attributed, but these cannot get out.
I can create can attributed value to 'catch' what a function returns,
but not automatically:
??? attributedInt()
{
@("Hello") int i = 1;
return i;
}
void main()
{
??? j = attributedInt();
// How to have j get the @("Hello") attribute?
}
The only way would be what you suggest:
- extract the attributes from the internal i
- store them in a specially-crafted struct
- return that
- in the external code, catch the returned struct
- extract the artificially stored attributes
- generate a new value with the same attributes.
You can perhaps encapsulate this in a mixin?
--
/Jacob Carlborg
