#ifndef CAFFE2_OPERATORS_NO_DEFAULT_ENGINE_OP_H_
#define CAFFE2_OPERATORS_NO_DEFAULT_ENGINE_OP_H_
#include "caffe2/core/context.h"
#include "caffe2/core/logging.h"
#include "caffe2/core/operator.h"
namespace caffe2 {
/**
* A helper class to denote that an op does not have a default engine.
*
* NoDefaultEngineOp is a helper class that one can use to denote that a
* specific operator is not intended to be called without an explicit engine
* given. This is the case for e.g. the communication operators where one has
* to specify a backend (like MPI or ZEROMQ).
*/
template