common.h

#pragma once
#include "gaia/config/config.h"
 
#include <cstdint>
 
namespace gaia {
  namespace ecs {
    GAIA_NODISCARD inline bool version_changed(uint32_t changeVersion, uint32_t requiredVersion) {
      // When a system runs for the first time, everything is considered changed.
      if GAIA_UNLIKELY (requiredVersion == 0U)
        return true;
 
      // Supporting wrap-around for version numbers. ChangeVersion must be
      // bigger than requiredVersion (never detect change of something the
      // system itself changed).
      return (int)(changeVersion - requiredVersion) > 0;
    }
 
    inline void update_version(uint32_t& version) {
      ++version;
      // Handle wrap-around, 0 is reserved for systems that have never run.
      if GAIA_UNLIKELY (version == 0U)
        ++version;
    }
  } // namespace ecs
} // namespace gaia