On Tuesday, 2 August 2022 at 04:06:30 UTC, frame wrote:
On Monday, 1 August 2022 at 23:35:13 UTC, pascal111 wrote:
This is the definition of "filter" function, and I think it
called itself within its definition. I'm guessing how it works?
It's a template that defines the function called "Eponymous
Templates":
https://dlang.org/spec/template.html#implicit_template_properties
A template generates code, it cannot be called, only
instantiated.
The common syntax is just a shortcut for using it. Otherwise
you would need to write `filter!(a => a > 0).filter([1, -1, 2,
0, -3])`. Like UFCS, some magic the compiler does for you.
Instantiation seems some complicated to me. I read "If a template
contains members whose name is the same as the template
identifier then these members are assumed to be referred to in a
template instantiation:" in the provided link, but I'm still
stuck. Do you have a down-to-earth example for beginners to
understand this concept?
