Method operator+

extensions/expression-language/Expression.cpp:1584–1627

}

Expression Expression::operator+(const Expression &other_expr) const {
  if (is_dynamic() && other_expr.is_dynamic()) {
    auto val_fn = val_fn_;
    auto other_val_fn = other_expr.val_fn_;
    auto sub_expr_generator = sub_expr_generator_;
    auto other_sub_expr_generator = other_expr.sub_expr_generator_;
    return make_dynamic([val_fn,
    other_val_fn,
    sub_expr_generator,
    other_sub_expr_generator](const Parameters &params,
        const std::vector<Expression>& /*sub_exprs*/) -> Value {
      Value result = val_fn(params, sub_expr_generator(params));
      return Value(result.asString().append(other_val_fn(params, other_sub_expr_generator(params)).asString()));
    });
  } else if (is_dynamic() && !other_expr.is_dynamic()) {
    auto val_fn = val_fn_;
    auto other_val = other_expr.val_;
    auto sub_expr_generator = sub_expr_generator_;
    return make_dynamic([val_fn,
    other_val,
    sub_expr_generator](const Parameters &params,
        const std::vector<Expression>& /*sub_exprs*/) -> Value {
      Value result = val_fn(params, sub_expr_generator(params));
      return Value(result.asString().append(other_val.asString()));
    });
  } else if (!is_dynamic() && other_expr.is_dynamic()) {
    auto val = val_;
    auto other_val_fn = other_expr.val_fn_;
    auto other_sub_expr_generator = other_expr.sub_expr_generator_;
    return make_dynamic([val,
    other_val_fn,
    other_sub_expr_generator](const Parameters &params,
        const std::vector<Expression>& /*sub_exprs*/) -> Value {
      Value result(val);
      return Value(result.asString().append(other_val_fn(params, other_sub_expr_generator(params)).asString()));
    });
  } else if (!is_dynamic() && !other_expr.is_dynamic()) {
    std::string result(val_.asString());
    result.append(other_expr.val_.asString());
    return make_static(result);
  } else {
    throw std::runtime_error("Invalid function composition");
  }
}

Value Expression::operator()(const Parameters &params) const {
  if (is_dynamic()) {