graph.zig

const Add = struct {
    operation: Operation,
    nodes: [2]Node,

    pub fn init(left: Tensor(f64, 0), right: Tensor(f64, 0)) Add {
        return .{
            .operation = .{ .inputs = inputs },
            .nodes = [_]Node{ left, right },
        };
    }

    pub fn inputs(operation: *const Operation) []const Node {
        const self = @fieldParentPtr(Add, "operation", operation);
        return &self.nodes;
    }
};