Make single-parameter constructors explicit

PiperOrigin-RevId: 157628970

tensorflow/c/c_api_test.cc

@@ -887,7 +887,7 @@ class CSession {
     TF_DeleteSessionOptions(opts);
   }
 
-  CSession(TF_Session* session) { session_ = session; }
+  explicit CSession(TF_Session* session) : session_(session) {}
 
   ~CSession() {
     TF_Status* s = TF_NewStatus();

tensorflow/cc/training/coordinator_test.cc

@@ -55,7 +55,7 @@ TEST(CoordinatorTest, TestStopAndWaitOnStop) {
 
 class MockQueueRunner : public RunnerInterface {
  public:
-  MockQueueRunner(Coordinator* coord) {
+  explicit MockQueueRunner(Coordinator* coord) {
     coord_ = coord;
     join_counter_ = nullptr;
     thread_pool_.reset(new thread::ThreadPool(Env::Default(), "test-pool", 10));

tensorflow/compiler/xla/service/gpu/while_transformer.cc

@@ -240,7 +240,7 @@ class MatcherBase {
 //
 class WhileConditionComputationMatcher : public MatcherBase {
  public:
-  WhileConditionComputationMatcher(const HloComputation* computation)
+  explicit WhileConditionComputationMatcher(const HloComputation* computation)
       : computation_(computation) {
     expr_trees_.emplace_back(BuildCondExprTree());
   }

tensorflow/contrib/cudnn_rnn/kernels/cudnn_rnn_ops.cc

@@ -230,7 +230,8 @@ inline perftools::gputools::port::Status ToExecutorStatus(const Status& s) {
 class CudnnRNNWorkspaceAllocator : public ScratchAllocator {
  public:
   ~CudnnRNNWorkspaceAllocator() override {}
-  CudnnRNNWorkspaceAllocator(OpKernelContext* context) : context_(context) {}
+  explicit CudnnRNNWorkspaceAllocator(OpKernelContext* context)
+      : context_(context) {}
   int64 GetMemoryLimitInBytes(perftools::gputools::Stream* stream) override {
     return std::numeric_limits<int64>::max();
   }
@@ -302,7 +303,7 @@ class CudnnRNNReserveSpaceAllocator : public ScratchAllocator {
 // This class is not thread-safe.
 class CudnnRNNPersistentSpaceAllocator : public ScratchAllocator {
  public:
-  CudnnRNNPersistentSpaceAllocator(OpKernelContext* context)
+  explicit CudnnRNNPersistentSpaceAllocator(OpKernelContext* context)
       : context_(context) {}
 
   ~CudnnRNNPersistentSpaceAllocator() override {}
@@ -460,7 +461,8 @@ void RestoreParams(const OpInputList params_input,
 // shape validations.
 class CudnnRNNKernelCommon : public OpKernel {
  protected:
-  CudnnRNNKernelCommon(OpKernelConstruction* context) : OpKernel(context) {
+  explicit CudnnRNNKernelCommon(OpKernelConstruction* context)
+      : OpKernel(context) {
     OP_REQUIRES_OK(context, context->GetAttr("dropout", &dropout_));
     OP_REQUIRES_OK(context, context->GetAttr("seed", &seed_));
     OP_REQUIRES_OK(context, context->GetAttr("seed2", &seed2_));

tensorflow/contrib/nccl/kernels/nccl_manager.cc

@@ -66,7 +66,7 @@ struct NcclManager::CommunicatorMember {
 
 struct NcclManager::Communicator {
  public:
-  Communicator(std::vector<CommunicatorMember> members)
+  explicit Communicator(std::vector<CommunicatorMember> members)
       : num_devices(members.size()), members(std::move(members)) {}
 
   const int num_devices;

tensorflow/contrib/nccl/kernels/nccl_ops.cc

@@ -38,7 +38,7 @@ namespace tensorflow {
 //    when the async op kernel's done callback is called.
 class NcclAsyncOpBase : public AsyncOpKernel {
  public:
-  NcclAsyncOpBase(OpKernelConstruction* c) : AsyncOpKernel(c) {
+  explicit NcclAsyncOpBase(OpKernelConstruction* c) : AsyncOpKernel(c) {
     OP_REQUIRES_OK(c, c->GetAttr("num_devices", &num_devices_));
     OP_REQUIRES_OK(c, c->GetAttr("shared_name", &collective_prefix_));
   }
@@ -62,7 +62,7 @@ class NcclAsyncOpBase : public AsyncOpKernel {
 // <k> devices in the communicator.
 class NcclAllReduceOpKernel : public NcclAsyncOpBase {
  public:
-  NcclAllReduceOpKernel(OpKernelConstruction* c) : NcclAsyncOpBase(c) {
+  explicit NcclAllReduceOpKernel(OpKernelConstruction* c) : NcclAsyncOpBase(c) {
     string reduction;
     OP_REQUIRES_OK(c, c->GetAttr("reduction", &reduction));
     if (reduction == "min") {
@@ -106,7 +106,8 @@ REGISTER_KERNEL_BUILDER(Name("NcclAllReduce").Device(DEVICE_GPU),
 
 class NcclBroadcastSendKernel : public NcclAsyncOpBase {
  public:
-  NcclBroadcastSendKernel(OpKernelConstruction* c) : NcclAsyncOpBase(c) {}
+  explicit NcclBroadcastSendKernel(OpKernelConstruction* c)
+      : NcclAsyncOpBase(c) {}
 
   void ComputeAsync(OpKernelContext* c, DoneCallback done) override {
     auto actual_done = [c, done](Status s) {
@@ -127,7 +128,8 @@ REGISTER_KERNEL_BUILDER(Name("NcclBroadcastSend").Device(DEVICE_GPU),
 
 class NcclBroadcastRecvKernel : public NcclAsyncOpBase {
  public:
-  NcclBroadcastRecvKernel(OpKernelConstruction* c) : NcclAsyncOpBase(c) {}
+  explicit NcclBroadcastRecvKernel(OpKernelConstruction* c)
+      : NcclAsyncOpBase(c) {}
 
   void ComputeAsync(OpKernelContext* c, DoneCallback done) override {
     const Tensor& shape_t = c->input(0);

tensorflow/contrib/rnn/kernels/lstm_ops.cc

@@ -524,7 +524,7 @@ namespace {
 template <typename Device, typename T>
 class SliceHelper {
  public:
-  SliceHelper(OpKernelContext* ctx)
+  explicit SliceHelper(OpKernelContext* ctx)
       : ctx_(ctx), device_(ctx_->eigen_device<Device>()) {}
 
   ~SliceHelper() {

tensorflow/core/common_runtime/gpu/gpu_event_mgr_test.cc

@@ -80,7 +80,7 @@ static std::atomic_int_fast64_t live_tensor_bytes(0);
 // A TensorBuffer that counts live memory usage for testing
 class TestTensorBuffer : public TensorBuffer {
  public:
-  TestTensorBuffer(size_t bytes) : bytes_(bytes) {
+  explicit TestTensorBuffer(size_t bytes) : bytes_(bytes) {
     live_tensor_bytes += bytes_;
   }
   ~TestTensorBuffer() override { live_tensor_bytes -= bytes_; }

tensorflow/core/common_runtime/local_device.cc

@@ -31,7 +31,7 @@ namespace tensorflow {
 bool LocalDevice::use_global_threadpool_ = true;
 
 struct LocalDevice::EigenThreadPoolInfo {
-  EigenThreadPoolInfo(const SessionOptions& options) {
+  explicit EigenThreadPoolInfo(const SessionOptions& options) {
     int32 intra_op_parallelism_threads =
         options.config.intra_op_parallelism_threads();
     if (intra_op_parallelism_threads == 0) {

tensorflow/core/framework/resource_mgr_test.cc

@@ -200,7 +200,9 @@ TEST(ContainerInfo, Error) {
 // handles.
 class StubDevice : public DeviceBase {
  public:
-  StubDevice(const string& name) : DeviceBase(nullptr) { attr_.set_name(name); }
+  explicit StubDevice(const string& name) : DeviceBase(nullptr) {
+    attr_.set_name(name);
+  }
 
   Allocator* GetAllocator(AllocatorAttributes) override {
     return cpu_allocator();

tensorflow/core/framework/tensor.cc

@@ -51,7 +51,7 @@ namespace {
 // An un-templated base class for Buffer.
 class BufferBase : public TensorBuffer {
  public:
-  BufferBase(Allocator* alloc) : alloc_(alloc) {}
+  explicit BufferBase(Allocator* alloc) : alloc_(alloc) {}
 
   TensorBuffer* root_buffer() override { return this; }
   void FillAllocationDescription(AllocationDescription* proto) const override {

tensorflow/core/kernels/adjust_hue_op.cc

@@ -39,7 +39,7 @@ typedef Eigen::GpuDevice GPUDevice;
 
 class AdjustHueOpBase : public OpKernel {
  protected:
-  AdjustHueOpBase(OpKernelConstruction* context) : OpKernel(context) {}
+  explicit AdjustHueOpBase(OpKernelConstruction* context) : OpKernel(context) {}
 
   struct ComputeOptions {
     const Tensor* input;

tensorflow/core/kernels/adjust_saturation_op.cc

@@ -30,7 +30,8 @@ typedef Eigen::GpuDevice GPUDevice;
 
 class AdjustSaturationOpBase : public OpKernel {
  protected:
-  AdjustSaturationOpBase(OpKernelConstruction* context) : OpKernel(context) {}
+  explicit AdjustSaturationOpBase(OpKernelConstruction* context)
+      : OpKernel(context) {}
 
   struct ComputeOptions {
     const Tensor* input;

tensorflow/core/kernels/fact_op.cc

@@ -95,7 +95,8 @@ class FactOpKernel : public OpKernel {
 
 class FactOpKernel1 : public FactOpKernel {
  public:
-  FactOpKernel1(OpKernelConstruction* context) : FactOpKernel(context) {}
+  explicit FactOpKernel1(OpKernelConstruction* context)
+      : FactOpKernel(context) {}
 
   void Compute(OpKernelContext* context) override {
     FactOpKernel::Compute(context, kFacts1, kNum1);
@@ -104,7 +105,8 @@ class FactOpKernel1 : public FactOpKernel {
 
 class FactOpKernel2 : public FactOpKernel {
  public:
-  FactOpKernel2(OpKernelConstruction* context) : FactOpKernel(context) {}
+  explicit FactOpKernel2(OpKernelConstruction* context)
+      : FactOpKernel(context) {}
 
   void Compute(OpKernelContext* context) override {
     FactOpKernel::Compute(context, kFacts2, kNum2);

tensorflow/core/kernels/resource_variable_ops.cc

@@ -148,7 +148,7 @@ REGISTER_KERNEL_BUILDER(Name("DestroyResourceOp").Device(DEVICE_CPU),
 template <typename Device, typename T>
 class AssignVariableOp : public OpKernel {
  public:
-  AssignVariableOp(OpKernelConstruction* c) : OpKernel(c) {
+  explicit AssignVariableOp(OpKernelConstruction* c) : OpKernel(c) {
     OP_REQUIRES_OK(c, c->GetAttr("dtype", &dtype_));
   }
 

tensorflow/core/kernels/sdca_ops.cc

@@ -64,7 +64,7 @@ using sdca::ExampleStatistics;
 using sdca::ModelWeights;
 
 struct ComputeOptions {
-  ComputeOptions(OpKernelConstruction* const context) {
+  explicit ComputeOptions(OpKernelConstruction* const context) {
     string loss_type;
     OP_REQUIRES_OK(context, context->GetAttr("loss_type", &loss_type));
     if (loss_type == "logistic_loss") {

tensorflow/core/kernels/sparse_tensors_map_ops.cc

@@ -41,7 +41,7 @@ using sparse::SparseTensor;
 
 class SparseTensorsMap : public ResourceBase {
  public:
-  SparseTensorsMap(const string& name) : name_(name), counter_(0) {}
+  explicit SparseTensorsMap(const string& name) : name_(name), counter_(0) {}
 
   string DebugString() override { return "A SparseTensorsMap"; }
 
@@ -116,7 +116,7 @@ class SparseTensorAccessingOp : public OpKernel {
  public:
   typedef std::function<Status(SparseTensorsMap**)> CreatorCallback;
 
-  SparseTensorAccessingOp(OpKernelConstruction* context)
+  explicit SparseTensorAccessingOp(OpKernelConstruction* context)
       : OpKernel(context), sparse_tensors_map_(nullptr) {}
 
  protected:

tensorflow/core/lib/io/inputstream_interface_test.cc

@@ -25,7 +25,7 @@ namespace {
 
 class TestStringStream : public InputStreamInterface {
  public:
-  TestStringStream(const string& content) : content_(content) {}
+  explicit TestStringStream(const string& content) : content_(content) {}
 
   Status ReadNBytes(int64 bytes_to_read, string* result) override {
     result->clear();

tensorflow/core/lib/io/iterator.cc

@@ -53,7 +53,7 @@ void Iterator::RegisterCleanup(CleanupFunction func, void* arg1, void* arg2) {
 namespace {
 class EmptyIterator : public Iterator {
  public:
-  EmptyIterator(const Status& s) : status_(s) {}
+  explicit EmptyIterator(const Status& s) : status_(s) {}
   bool Valid() const override { return false; }
   void Seek(const StringPiece& target) override {}
   void SeekToFirst() override {}

tensorflow/core/lib/io/table_test.cc

@@ -109,7 +109,7 @@ class StringSink : public WritableFile {
 
 class StringSource : public RandomAccessFile {
  public:
-  StringSource(const StringPiece& contents)
+  explicit StringSource(const StringPiece& contents)
       : contents_(contents.data(), contents.size()), bytes_read_(0) {}
 
   ~StringSource() override {}

tensorflow/core/platform/cloud/retrying_file_system_test.cc

@@ -35,7 +35,7 @@ ExpectedCalls CreateRetriableErrors(const string& method, int n) {
 // A class to manage call expectations on mock implementations.
 class MockCallSequence {
  public:
-  MockCallSequence(const ExpectedCalls& calls) : calls_(calls) {}
+  explicit MockCallSequence(const ExpectedCalls& calls) : calls_(calls) {}
 
   ~MockCallSequence() {
     EXPECT_TRUE(calls_.empty())
@@ -57,7 +57,7 @@ class MockCallSequence {
 
 class MockRandomAccessFile : public RandomAccessFile {
  public:
-  MockRandomAccessFile(const ExpectedCalls& calls) : calls_(calls) {}
+  explicit MockRandomAccessFile(const ExpectedCalls& calls) : calls_(calls) {}
   Status Read(uint64 offset, size_t n, StringPiece* result,
               char* scratch) const override {
     return calls_.ConsumeNextCall("Read");
@@ -69,7 +69,7 @@ class MockRandomAccessFile : public RandomAccessFile {
 
 class MockWritableFile : public WritableFile {
  public:
-  MockWritableFile(const ExpectedCalls& calls) : calls_(calls) {}
+  explicit MockWritableFile(const ExpectedCalls& calls) : calls_(calls) {}
   Status Append(const StringPiece& data) override {
     return calls_.ConsumeNextCall("Append");
   }
@@ -83,7 +83,7 @@ class MockWritableFile : public WritableFile {
 
 class MockFileSystem : public FileSystem {
  public:
-  MockFileSystem(const ExpectedCalls& calls) : calls_(calls) {}
+  explicit MockFileSystem(const ExpectedCalls& calls) : calls_(calls) {}
 
   Status NewRandomAccessFile(
       const string& fname, std::unique_ptr<RandomAccessFile>* result) override {

tensorflow/core/util/example_proto_fast_parsing.cc

@@ -66,7 +66,7 @@ namespace parsed {
 class Feature {
  public:
   Feature() {}
-  Feature(StringPiece serialized) : serialized_(serialized) {}
+  explicit Feature(StringPiece serialized) : serialized_(serialized) {}
 
   Status ParseDataType(DataType* dtype) {
     DCHECK(dtype != nullptr);

tensorflow/python/framework/test_ops.cc

@@ -107,7 +107,7 @@ REGISTER_KERNEL_BUILDER(Name("KernelLabel")
 
 class GraphDefVersionOp : public OpKernel {
  public:
-  GraphDefVersionOp(OpKernelConstruction* ctx)
+  explicit GraphDefVersionOp(OpKernelConstruction* ctx)
       : OpKernel(ctx), graph_def_version_(ctx->graph_def_version()) {}
 
   void Compute(OpKernelContext* ctx) override {
@@ -125,7 +125,7 @@ REGISTER_KERNEL_BUILDER(Name("GraphDefVersion").Device(DEVICE_CPU),
 
 class OldOp : public OpKernel {
  public:
-  OldOp(OpKernelConstruction* ctx) : OpKernel(ctx) {}
+  explicit OldOp(OpKernelConstruction* ctx) : OpKernel(ctx) {}
 
   void Compute(OpKernelContext* ctx) override {}
 };
@@ -145,7 +145,7 @@ REGISTER_KERNEL_BUILDER(Name("ResourceInitializedOp").Device(DEVICE_CPU),
 
 class ResourceCreateOp : public OpKernel {
  public:
-  ResourceCreateOp(OpKernelConstruction* c) : OpKernel(c) {}
+  explicit ResourceCreateOp(OpKernelConstruction* c) : OpKernel(c) {}
 
   void Compute(OpKernelContext* c) override {
     OP_REQUIRES_OK(c,

tensorflow/tools/proto_text/gen_proto_text_functions_lib.cc

@@ -58,7 +58,7 @@ string StrAppend(string* to_append, const Args&... args) {
 // the field names (it's a loop over all names), and tracking of has_seen.
 class Generator {
  public:
-  Generator(const string& tf_header_prefix)
+  explicit Generator(const string& tf_header_prefix)
       : tf_header_prefix_(tf_header_prefix),
         header_(&code_.header),
         header_impl_(&code_.header_impl),
@@ -71,7 +71,7 @@ class Generator {
 
  private:
   struct Section {
-    Section(string* str) : str(str) {}
+    explicit Section(string* str) : str(str) {}
     string* str;
     string indent;
   };