Parameterized delegate attributes

[Lodovico Giaretta via Digitalmars-d]

On Wednesday, 28 September 2016 at 16:20:18 UTC, Eyal Lotem wrote:
> [...]

I would just make opApply a templated function, for the following 
reasons:

1) You are saying that having this feature in the language would 
spare some template instantiations and code generations; but a 
good compiler should be able to recognize functions with the same 
code and fold them; for example, if a function takes a generic 
pointer, chances are it doesn't need to be duplicated for every 
pointer type.

2) It is actually not true that attributes are only for type 
checking; the compiler can use them to generate different code: a 
nothrow function does not need machinery to forward exceptions 
and clean the stack, for example; so templates are the correct 
way here, because they can generate different code when needed 
and also be folded to a single codegen if possible.