result_type.h

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#ifndef RESULT_TYPE_INCLUDED
#define RESULT_TYPE_INCLUDED
 
namespace dd {
/**
  Template for structs to hold results from functions. That way values can
  be "returned" also from functions which can fail.
  */
template <typename VT>
struct ResultType {
  bool error;
  VT value;
};
}  // namespace dd
 
#endif /* RESULT_TYPE_INCLUDED */