Class BinaryGenerator

tests/unit/sys/test_expressionparser.cxx:36–61

For testing, a generator function of two inputs

/// For testing, a generator function of two inputs
class BinaryGenerator : public FieldGenerator {
public:
  BinaryGenerator(std::shared_ptr<FieldGenerator> a = nullptr,
                  std::shared_ptr<FieldGenerator> b = nullptr)
      : a(std::move(a)), b(std::move(b)) {}

  std::shared_ptr<FieldGenerator>
  clone(const std::list<std::shared_ptr<FieldGenerator>> args) override {
    if (args.size() != 2) {
      throw ParseException(
          "Incorrect number of arguments to increment function. Expecting 2, got {:d}",
          args.size());
    }

    return std::make_shared<BinaryGenerator>(args.front(), args.back());
  }
  BoutReal generate(const Context& ctx) override {
    return a->generate(ctx) + b->generate(ctx);
  }
  std::string str() const override {
    return std::string{"add(" + a->str() + ", " + b->str() + ")"};
  }

private:
  std::shared_ptr<FieldGenerator> a, b;
};

class IncrementGenerator : public FieldGenerator {
public: