reflection/auto_define_struct

• C

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  #include <auto_define_struct.h>
  #include <stdio.h>
   
  // Captures reflection data for Position
  ECS_STRUCT(Position, {
      float x;
      float y;
  });
   
  int main(int argc, char *argv[]) {
      ecs_world_t *ecs = ecs_init_w_args(argc, argv);
   
      // This registers the component with reflection data
      ECS_META_COMPONENT(ecs, Position);
   
      // Serialize as usual
      Position value = {10, 20};
      char *json = ecs_ptr_to_json(ecs, ecs_id(Position), &value);
      printf("%s\n", json); // {"x": 10.0, "y": 20.0}
      ecs_os_free(json);
   
      return ecs_fini(ecs);
  }

• C++

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  #include <auto_define_struct.h>
  #include <iostream>
   
  // Capture reflection data for Position
  ECS_STRUCT(Position, {
      float x;
      float y;
  });
   
  int main(int, char *[]) {
      flecs::world ecs;
   
      // Serialize as usual. Component registration automatically detects the
      // reflection data. 
      Position value = {10, 20};
      std::cout << ecs.to_json(&value) << "\n"; // {"x":10, "y":20}
  }