syntax = "proto3";

package demo;

import "types.proto";

// A top-level enum: ONE shared C++ type (demo::Kind) in message.rp.common.hpp that both the arena and
// the streaming decoder include -- so the consumer can use it with either model in the same TU.
enum Kind {
  KIND_UNKNOWN = 0;
  KIND_CIRCLE = 1;
  KIND_SQUARE = 2;
}

message Shape {
  string name = 1;
  Point origin = 2;
  Kind kind = 3;
  repeated int32 sides = 4;  // navigable array (arena) / per-element callback (streaming)
}