Class CelValue

eval/public/cel_value.h:60–531

class LegacyTypeAdapter;

class CelValue {
 public:
  // This class is a container to hold strings/bytes.
  // Template parameter N is an artificial discriminator, used to create
  // distinct types for String and Bytes (we need distinct types for Oneof).
  template <int N>
  class StringHolderBase {
   public:
    StringHolderBase() : value_(absl::string_view()) {}

    StringHolderBase(const StringHolderBase&) = default;
    StringHolderBase& operator=(const StringHolderBase&) = default;

    // string parameter is passed through pointer to ensure string_view is not
    // initialized with string rvalue. Also, according to Google style guide,
    // passing pointers conveys the message that the reference to string is kept
    // in the constructed holder object.
    explicit StringHolderBase(const std::string* str) : value_(*str) {}

    absl::string_view value() const { return value_; }

    // Group of comparison operations.
    friend bool operator==(StringHolderBase value1, StringHolderBase value2) {
      return value1.value_ == value2.value_;
    }

    friend bool operator!=(StringHolderBase value1, StringHolderBase value2) {
      return value1.value_ != value2.value_;
    }

    friend bool operator<(StringHolderBase value1, StringHolderBase value2) {
      return value1.value_ < value2.value_;
    }

    friend bool operator<=(StringHolderBase value1, StringHolderBase value2) {
      return value1.value_ <= value2.value_;
    }

    friend bool operator>(StringHolderBase value1, StringHolderBase value2) {
      return value1.value_ > value2.value_;
    }

    friend bool operator>=(StringHolderBase value1, StringHolderBase value2) {
      return value1.value_ >= value2.value_;
    }

    friend class CelValue;

   private:
    explicit StringHolderBase(absl::string_view other) : value_(other) {}

    absl::string_view value_;
  };

  // Helper structure for String datatype.
  using StringHolder = StringHolderBase<0>;

  // Helper structure for Bytes datatype.