Method ~CustomSmartPtr

test/embind/embind_test.cpp:1702–1709

  }

  ~CustomSmartPtr() {
    verify();
    std::fill(d_, d_ + N_, Deleted);

    if (ptr_ && --ptr_->refcount == 0) {
      delete ptr_;
    }
  }

  T* get_raw() const {
    return ptr_;