evaluation_context.h

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#if !defined(ULTRA_EVALUATION_CONTEXT_H)
#define      ULTRA_EVALUATION_CONTEXT_H
 
#include <concepts>
 
namespace ultra
{

enum class [[nodiscard]] evaluation_context
{
  unchanged,
  changed
};

template<class E>
concept ClearableEvaluator =
  requires(E &eva)
  {
    { eva.clear() } -> std::same_as<void>;
  };

template<class E>
void invalidate_cache_if_supported(E &eva)
{
  if constexpr (ClearableEvaluator<E>)
    eva.clear();
}
 
}  // namespace ultra
 
#endif  // include guard