Method MutableArena

eval/compiler/flat_expr_builder_extensions.h:405–411

  bool HasExplicitArena() const { return explicit_arena_; }

  google::protobuf::Arena* absl_nonnull MutableArena() {
    if (!explicit_arena_ && arena_ == nullptr) {
      arena_ = std::make_shared<google::protobuf::Arena>();
    }
    ABSL_DCHECK(arena_ != nullptr);
    return arena_.get();
  }

  // Returns `true` if a message factory was explicitly provided during
  // planning.