On Thursday, 25 February 2016 at 09:11:58 UTC, Atila Neves wrote:
On Thursday, 25 February 2016 at 01:57:37 UTC, Iakh wrote:
On Friday, 30 October 2015 at 14:39:47 UTC, Atila Neves wrote:
[...]
It could be better to extend UDA with checking and diagnostic
functions
@IsInputRange
struct myRange {...
And some attrs not applicable for all things, extended UDA can
handle it
Scanning for UDAs for a whole project isn't trivial and even
worse optional.
Atila
I meant extend UDAs to match your proposal. But rules to build
failFunc in both cases looks too sophisticated.
Simpler version could looks like this:
// Predicate:
enum bool checkConstraint(bool verbose) = /*Whatever you want*/
struct Struct{
mixin checkConstraint!(isOutputRange, int); // int represents
tail template args
}
mixin checkConstrint!(...) adds this code:
static if(!isOutputRange!(Struct,
int).checkConstraint!(No.verbose))
{
static assert(isOutputRange!(Struct,
int).checkConstraint!(Yes.verbose));
}
