reflection/basics_enum

• C

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  #include <basics_enum.h>
  #include <stdio.h>
   
  typedef enum {
      Red,
      Green,
      Blue
  } Color;
   
  typedef struct {
      Color color;
  } TypeWithEnum;
   
  int main(int argc, char *argv[]) {
      ecs_world_t *ecs = ecs_init_w_args(argc, argv);
   
      // Register component as usual
      ECS_COMPONENT(ecs, Color);
      ECS_COMPONENT(ecs, TypeWithEnum);
   
      // Add reflection data to components
      ecs_enum(ecs, {
          .entity = ecs_id(Color), // Make sure to use existing id
          .constants = {
              { .name = "Red", .value = Red },
              { .name = "Green", .value = Green },
              { .name = "Blue", .value = Blue }
          }
      });
   
      ecs_struct(ecs, {
          .entity = ecs_id(TypeWithEnum), // Make sure to use existing id
          .members = {
              { .name = "color", .type = ecs_id(Color) }
          }
      });
   
      // Create entity with TypeWithEnum as usual
      ecs_entity_t ent = ecs_new(ecs);
      ecs_set(ecs, ent, TypeWithEnum, {Green});
   
      // Convert TypeWithEnum component to flecs expression string
      const TypeWithEnum *ptr = ecs_get(ecs, ent, TypeWithEnum);
      char *str = ecs_ptr_to_expr(ecs, ecs_id(TypeWithEnum), ptr);
      printf("%s\n", str); // {color: Green}
      ecs_os_free(str);
   
      ecs_fini(ecs);
  }

• C++

  View on GitHub

  #include <basics_enum.h>
  #include <iostream>
   
  enum Color {
      Red,
      Green,
      Blue
  };
   
  struct TypeWithEnum {
      Color color;
  };
   
  int main(int, char *[]) {
      flecs::world ecs;
   
      // Register components with reflection data
      ecs.component<Color>()
          .constant("Red", Red)
          .constant("Green", Green)
          .constant("Blue", Blue);
   
      ecs.component<TypeWithEnum>()
          .member<Color>("color");
   
      // Create entity with TypeWithEnum as usual
      flecs::entity e = ecs.entity()
          .set<TypeWithEnum>({Green});
   
      // Convert TypeWithEnum component to flecs expression string
      const TypeWithEnum& c = e.get<TypeWithEnum>();
      std::cout << ecs.to_expr(&c).c_str() << "\n"; // {color: Green}
  }