Method at

tensorflow/core/framework/op_kernel.h:1749–1753

}

inline Tensor OpMutableInputList::at(int i, bool lock_held) {
  DCHECK_GE(i, 0);
  DCHECK_LT(i, stop_ - start_);
  return ctx_->mutable_input(start_ + i, lock_held);
}

inline Tensor* OpOutputList::operator[](int i) {
  DCHECK_GE(i, 0);