reflection/portable_type

• C++

  View on GitHub

  #include <portable_type.h>
  #include <iostream>
   
  // The actual types of int32_t and uintptr_t vary between platforms.
  struct PortableType {
      int32_t i32;
      uintptr_t intptr;
  };
   
  int main(int, char *[]) {
      flecs::world ecs;
   
      // Register component. Do not use std::int32_t or std::uintptr_t for the 
      // member type as this will resolve to a different integer type depending on
      // the platform, which can cause unexpected issues when type information is
      // shared between platforms.
      ecs.component<PortableType>()
          .member(flecs::I32, "i32") // Use platform-independent type ids
          .member(flecs::Uptr, "intptr");
   
      // Create entity with PortableType
      flecs::entity e = ecs.entity()
          .set<PortableType>({10, 20});
   
      // Convert PortableType component to flecs expression string
      const PortableType& ptr = e.get<PortableType>();
      std::cout << ecs.to_expr(&ptr).c_str() << "\n"; // {i32: 10, inptr: 20}
  }