Implementing a `std.io.Reader`

[kj4tmp]

Oh man I got that reader working and now I have no idea how to use it.

I have read

Pass a Reader to a function as argument

Hi! I’m trying to implement a function that works in a similar way to the getline function in C. It has the following signature: pub fn getLine(list: *std.ArrayList(u8), reader: anytype) !?[]const u8 Right now the type of the reader is anytype, and this bothers me. I would like that the type of reader would be more restrictive, something like: reader: std.io.Reader, std.io.AnyReader or std.io.GenericReader, or something like that. Basically something that has a fn read(self: Self, buffer: …

but now I want to pass this reader into a function.

Am I restricted to using anytype?

pub fn packFromECatReader(comptime T: type, reader: anytype) !T {
    var bytes: [@divExact(@bitSizeOf(T), 8)]u8 = undefined;
    try reader.readNoEof(&bytes);
    return packFromECat(T, bytes);
}

This is so brutal that I lose all the type information.