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#ifndef TENSORFLOW_FRAMEWORK_CONTROL_FLOW_H_
#define TENSORFLOW_FRAMEWORK_CONTROL_FLOW_H_
#include "tensorflow/core/platform/port.h"
#include "tensorflow/core/platform/logging.h"
#include "tensorflow/core/lib/hash/hash.h"
namespace tensorflow {
const uint64 kIllegalFrameId = ~0uLL;
const int64 kIllegalIterId = -1;
// For the purpose of control flow, every tensor produced by TensorFlow is
// conceptually tagged by a 'FrameAndIter'. FrameAndIter consists of a
// 'frame_id' and an 'iter_id'. The tensor value it represents is produced
// in the frame with frame_id at the iteration of iter_id.
struct FrameAndIter {
uint64 frame_id = kIllegalFrameId;
int64 iter_id = kIllegalIterId;
FrameAndIter() {}
FrameAndIter(uint64 frame, int64 iter) {
frame_id = frame;
iter_id = iter;
}
bool operator==(const FrameAndIter& other) const {
return (frame_id == other.frame_id && iter_id == other.iter_id);
}
};
struct FrameAndIterHash {
size_t operator()(const FrameAndIter& key) const {
// Make sure there are no padding bytes that we don't want
CHECK_EQ(sizeof(uint64) + sizeof(int64), sizeof(FrameAndIter));
return Hash64(reinterpret_cast<const char*>(&key), sizeof(FrameAndIter));
}
};
} // namespace tensorflow
#endif // TENSORFLOW_FRAMEWORK_CONTROL_FLOW_H_
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