On 2017-11-29 13:53, Seb wrote:
UDAs for function arguments would be really awesome to have. Just
imagine how nice the Vibe.d web routes would look like:
auto postUser(@body User user, @errors Errors errors)
Instead of:
@body("user")
@errorDisplay
auto postUsers(User _user, string _error)
Or:
@path("/users/:id")
auto getUser(@urlParam string id, @queryParam int page, @auth User user)
Instead of:
@path("/users/:id")
@queryParam("page")
@before!authenticate("user")
auto getUsers(string _id, int page, User user)
(This is pseudo-syntax as I write this from my phone).
Yeah, that would be nice. I had another use case in mind as well, for
DStep. Clang supports nullability attributes [1] which could be
translated to UDAs. They would do anything but would be more for
documentation purpose. I guess external tools could be built to actually
do something useful with the attributes. Example:
In C:
int fetch(int * _Nonnull ptr);
In D:
int fetch(@Nonnull int* ptr);
[1]
https://clang.llvm.org/docs/AttributeReference.html#nullability-attributes
--
/Jacob Carlborg
