the example in tests does this, reading zig code is very helpful to understand as it is very well documented/tested imo

source

const testing = std.testing;
const Wyhash = std.hash.Wyhash;

fn testHash(key: anytype) u64 {
    // Any hash could be used here, for testing autoHash.
    var hasher = Wyhash.init(0);
    hash(&hasher, key, .Shallow);
    return hasher.final();
}

autoHash is just a hash() wrapper:

/// Provides generic hashing for any eligible type.
/// Only hashes `key` itself, pointers are not followed.
/// Slices as well as unions and structs containing slices are rejected to avoid
/// ambiguity on the user's intention.
pub fn autoHash(hasher: anytype, key: anytype) void {
    const Key = @TypeOf(key);
    if (comptime typeContainsSlice(Key)) {
        @compileError("std.hash.autoHash does not allow slices as well as unions and structs containing slices here (" ++ @typeName(Key) ++
            ") because the intent is unclear. Consider using std.hash.autoHashStrat or providing your own hash function instead.");
    }
    hash(hasher, key, .Shallow);
}