Method Allocator

common/memory.h:319–322

  static Borrower None() noexcept { return Borrower(); }

  static Borrower Allocator(Allocator<> allocator) noexcept {
    auto* arena = allocator.arena();
    return arena != nullptr ? Arena(arena) : None();
  }

  static Borrower Arena(google::protobuf::Arena* absl_nonnull arena
                            ABSL_ATTRIBUTE_LIFETIME_BOUND) noexcept {