how to allow for different arguments in my dispatcher

[dim eagle]

I currently have something like that, but I would like to basically allow for custom arguments, and then when dispatching I would try to give them what they are asking for or fail.
Basically something like axum in rust did if you are familiar with that framework.

pub const dispatcher: std.StaticStringMap(*const fn (
        self: *UserContext,
        arena: std.mem.Allocator,
        rest: std.StringHashMap([]const u8),
    ) anyerror!void
) = .initComptime(.{
    .{ "addon", handleAddon },
    .{ "init", inits.handler },
    .{ "emo", emotion.handler },

For example handleAddon should only have 1 argument - *UserContext

[lunar knot]

I thinks you can use and *anyopaque (be careful of the lifetime or allocate it in the heap)
And then you can do a @ptrcast

The problem is you lose the type cheking

you may use different function to add the args and then ptrcast to anyopaque.

[rain rivet]

Here's example how I did it in zig-router
https://github.com/Cloudef/zig-router/blob/master/src/router.zig#L174-L212

Simplified what you need for type based argument passing here https://github.com/Cloudef/ztd/blob/master/src/bind.zig

[dim eagle]

Thank you all for your input, I will take a look and implement something for myself.

[dim eagle]

@rain rivet your solution is exactly what I needed, thank you again. If you are familiar with axum in rust, is this basically the same way they achieved dependency injection?

[rain rivet]

not sure how they do it in axum, but at least this is how bevy does it. But of course it's lot more unreadable in rust