On Tuesday, 5 April 2016 at 19:59:15 UTC, Jacob Carlborg wrote:
On 5 apr 2016, at 16:54, Simen Kjaeraas via dmd-internals
<[email protected]> wrote:
To get to know DMD a bit more, I decided to implement
__GENSYM__, as touched upon in Nordlöw's post on Units of
Measurements[1].
My implementation uses the mangled name of the instantiation
scope and an associated counter to create a unique string, and
works great for template default parameters (which is where I
imagine it would see use).
For completeness though, I wanted to make it work as a
function default parameter as well. Looking at how __FILE__
and __LINE__ are implemented, they use only Loc, not Scope. Is
it at all possible to get the calling scope for a function?
Not sure where you’re looking but I would guess __FILE_ and
__LINE__ are handled here [1], where the scope is available.
[1]
https://github.com/D-Programming-Language/dmd/blob/master/src/expression.d#L1446
Thanks! I realized I'd misunderstood how __FUNCTION__ works,
which is the one I should have been looking at.
That takes care using __GENSYM__ in functions, and SCOPEctfe
handles using it in module or aggregate scopes:
struct S {
enum s = __GENSYM__;
}
So it seems to be working now. Thanks a lot!
--
Simen
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