yaml-cpp

gtest-param-util.h (33066B)

---

 // Copyright 2008 Google Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
 // Type and function utilities for implementing parameterized tests.
 
 // GOOGLETEST_CM0001 DO NOT DELETE
 
 #ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PARAM_UTIL_H_
 #define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PARAM_UTIL_H_
 
 #include <ctype.h>
 
 #include <cassert>
 #include <iterator>
 #include <memory>
 #include <set>
 #include <tuple>
 #include <utility>
 #include <vector>
 
 #include "gtest/internal/gtest-internal.h"
 #include "gtest/internal/gtest-port.h"
 #include "gtest/gtest-printers.h"
 
 namespace testing {
 // Input to a parameterized test name generator, describing a test parameter.
 // Consists of the parameter value and the integer parameter index.
 template <class ParamType>
 struct TestParamInfo {
   TestParamInfo(const ParamType& a_param, size_t an_index) :
     param(a_param),
     index(an_index) {}
   ParamType param;
   size_t index;
 };
 
 // A builtin parameterized test name generator which returns the result of
 // testing::PrintToString.
 struct PrintToStringParamName {
   template <class ParamType>
   std::string operator()(const TestParamInfo<ParamType>& info) const {
     return PrintToString(info.param);
   }
 };
 
 namespace internal {
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 // Utility Functions
 
 // Outputs a message explaining invalid registration of different
 // fixture class for the same test suite. This may happen when
 // TEST_P macro is used to define two tests with the same name
 // but in different namespaces.
 GTEST_API_ void ReportInvalidTestSuiteType(const char* test_suite_name,
                                            CodeLocation code_location);
 
 template <typename> class ParamGeneratorInterface;
 template <typename> class ParamGenerator;
 
 // Interface for iterating over elements provided by an implementation
 // of ParamGeneratorInterface<T>.
 template <typename T>
 class ParamIteratorInterface {
  public:
   virtual ~ParamIteratorInterface() {}
   // A pointer to the base generator instance.
   // Used only for the purposes of iterator comparison
   // to make sure that two iterators belong to the same generator.
   virtual const ParamGeneratorInterface<T>* BaseGenerator() const = 0;
   // Advances iterator to point to the next element
   // provided by the generator. The caller is responsible
   // for not calling Advance() on an iterator equal to
   // BaseGenerator()->End().
   virtual void Advance() = 0;
   // Clones the iterator object. Used for implementing copy semantics
   // of ParamIterator<T>.
   virtual ParamIteratorInterface* Clone() const = 0;
   // Dereferences the current iterator and provides (read-only) access
   // to the pointed value. It is the caller's responsibility not to call
   // Current() on an iterator equal to BaseGenerator()->End().
   // Used for implementing ParamGenerator<T>::operator*().
   virtual const T* Current() const = 0;
   // Determines whether the given iterator and other point to the same
   // element in the sequence generated by the generator.
   // Used for implementing ParamGenerator<T>::operator==().
   virtual bool Equals(const ParamIteratorInterface& other) const = 0;
 };
 
 // Class iterating over elements provided by an implementation of
 // ParamGeneratorInterface<T>. It wraps ParamIteratorInterface<T>
 // and implements the const forward iterator concept.
 template <typename T>
 class ParamIterator {
  public:
   typedef T value_type;
   typedef const T& reference;
   typedef ptrdiff_t difference_type;
 
   // ParamIterator assumes ownership of the impl_ pointer.
   ParamIterator(const ParamIterator& other) : impl_(other.impl_->Clone()) {}
   ParamIterator& operator=(const ParamIterator& other) {
     if (this != &other)
       impl_.reset(other.impl_->Clone());
     return *this;
   }
 
   const T& operator*() const { return *impl_->Current(); }
   const T* operator->() const { return impl_->Current(); }
   // Prefix version of operator++.
   ParamIterator& operator++() {
     impl_->Advance();
     return *this;
   }
   // Postfix version of operator++.
   ParamIterator operator++(int /*unused*/) {
     ParamIteratorInterface<T>* clone = impl_->Clone();
     impl_->Advance();
     return ParamIterator(clone);
   }
   bool operator==(const ParamIterator& other) const {
     return impl_.get() == other.impl_.get() || impl_->Equals(*other.impl_);
   }
   bool operator!=(const ParamIterator& other) const {
     return !(*this == other);
   }
 
  private:
   friend class ParamGenerator<T>;
   explicit ParamIterator(ParamIteratorInterface<T>* impl) : impl_(impl) {}
   std::unique_ptr<ParamIteratorInterface<T> > impl_;
 };
 
 // ParamGeneratorInterface<T> is the binary interface to access generators
 // defined in other translation units.
 template <typename T>
 class ParamGeneratorInterface {
  public:
   typedef T ParamType;
 
   virtual ~ParamGeneratorInterface() {}
 
   // Generator interface definition
   virtual ParamIteratorInterface<T>* Begin() const = 0;
   virtual ParamIteratorInterface<T>* End() const = 0;
 };
 
 // Wraps ParamGeneratorInterface<T> and provides general generator syntax
 // compatible with the STL Container concept.
 // This class implements copy initialization semantics and the contained
 // ParamGeneratorInterface<T> instance is shared among all copies
 // of the original object. This is possible because that instance is immutable.
 template<typename T>
 class ParamGenerator {
  public:
   typedef ParamIterator<T> iterator;
 
   explicit ParamGenerator(ParamGeneratorInterface<T>* impl) : impl_(impl) {}
   ParamGenerator(const ParamGenerator& other) : impl_(other.impl_) {}
 
   ParamGenerator& operator=(const ParamGenerator& other) {
     impl_ = other.impl_;
     return *this;
   }
 
   iterator begin() const { return iterator(impl_->Begin()); }
   iterator end() const { return iterator(impl_->End()); }
 
  private:
   std::shared_ptr<const ParamGeneratorInterface<T> > impl_;
 };
 
 // Generates values from a range of two comparable values. Can be used to
 // generate sequences of user-defined types that implement operator+() and
 // operator<().
 // This class is used in the Range() function.
 template <typename T, typename IncrementT>
 class RangeGenerator : public ParamGeneratorInterface<T> {
  public:
   RangeGenerator(T begin, T end, IncrementT step)
       : begin_(begin), end_(end),
         step_(step), end_index_(CalculateEndIndex(begin, end, step)) {}
   ~RangeGenerator() override {}
 
   ParamIteratorInterface<T>* Begin() const override {
     return new Iterator(this, begin_, 0, step_);
   }
   ParamIteratorInterface<T>* End() const override {
     return new Iterator(this, end_, end_index_, step_);
   }
 
  private:
   class Iterator : public ParamIteratorInterface<T> {
    public:
     Iterator(const ParamGeneratorInterface<T>* base, T value, int index,
              IncrementT step)
         : base_(base), value_(value), index_(index), step_(step) {}
     ~Iterator() override {}
 
     const ParamGeneratorInterface<T>* BaseGenerator() const override {
       return base_;
     }
     void Advance() override {
       value_ = static_cast<T>(value_ + step_);
       index_++;
     }
     ParamIteratorInterface<T>* Clone() const override {
       return new Iterator(*this);
     }
     const T* Current() const override { return &value_; }
     bool Equals(const ParamIteratorInterface<T>& other) const override {
       // Having the same base generator guarantees that the other
       // iterator is of the same type and we can downcast.
       GTEST_CHECK_(BaseGenerator() == other.BaseGenerator())
           << "The program attempted to compare iterators "
           << "from different generators." << std::endl;
       const int other_index =
           CheckedDowncastToActualType<const Iterator>(&other)->index_;
       return index_ == other_index;
     }
 
    private:
     Iterator(const Iterator& other)
         : ParamIteratorInterface<T>(),
           base_(other.base_), value_(other.value_), index_(other.index_),
           step_(other.step_) {}
 
     // No implementation - assignment is unsupported.
     void operator=(const Iterator& other);
 
     const ParamGeneratorInterface<T>* const base_;
     T value_;
     int index_;
     const IncrementT step_;
   };  // class RangeGenerator::Iterator
 
   static int CalculateEndIndex(const T& begin,
                                const T& end,
                                const IncrementT& step) {
     int end_index = 0;
     for (T i = begin; i < end; i = static_cast<T>(i + step))
       end_index++;
     return end_index;
   }
 
   // No implementation - assignment is unsupported.
   void operator=(const RangeGenerator& other);
 
   const T begin_;
   const T end_;
   const IncrementT step_;
   // The index for the end() iterator. All the elements in the generated
   // sequence are indexed (0-based) to aid iterator comparison.
   const int end_index_;
 };  // class RangeGenerator
 
 
 // Generates values from a pair of STL-style iterators. Used in the
 // ValuesIn() function. The elements are copied from the source range
 // since the source can be located on the stack, and the generator
 // is likely to persist beyond that stack frame.
 template <typename T>
 class ValuesInIteratorRangeGenerator : public ParamGeneratorInterface<T> {
  public:
   template <typename ForwardIterator>
   ValuesInIteratorRangeGenerator(ForwardIterator begin, ForwardIterator end)
       : container_(begin, end) {}
   ~ValuesInIteratorRangeGenerator() override {}
 
   ParamIteratorInterface<T>* Begin() const override {
     return new Iterator(this, container_.begin());
   }
   ParamIteratorInterface<T>* End() const override {
     return new Iterator(this, container_.end());
   }
 
  private:
   typedef typename ::std::vector<T> ContainerType;
 
   class Iterator : public ParamIteratorInterface<T> {
    public:
     Iterator(const ParamGeneratorInterface<T>* base,
              typename ContainerType::const_iterator iterator)
         : base_(base), iterator_(iterator) {}
     ~Iterator() override {}
 
     const ParamGeneratorInterface<T>* BaseGenerator() const override {
       return base_;
     }
     void Advance() override {
       ++iterator_;
       value_.reset();
     }
     ParamIteratorInterface<T>* Clone() const override {
       return new Iterator(*this);
     }
     // We need to use cached value referenced by iterator_ because *iterator_
     // can return a temporary object (and of type other then T), so just
     // having "return &*iterator_;" doesn't work.
     // value_ is updated here and not in Advance() because Advance()
     // can advance iterator_ beyond the end of the range, and we cannot
     // detect that fact. The client code, on the other hand, is
     // responsible for not calling Current() on an out-of-range iterator.
     const T* Current() const override {
       if (value_.get() == nullptr) value_.reset(new T(*iterator_));
       return value_.get();
     }
     bool Equals(const ParamIteratorInterface<T>& other) const override {
       // Having the same base generator guarantees that the other
       // iterator is of the same type and we can downcast.
       GTEST_CHECK_(BaseGenerator() == other.BaseGenerator())
           << "The program attempted to compare iterators "
           << "from different generators." << std::endl;
       return iterator_ ==
           CheckedDowncastToActualType<const Iterator>(&other)->iterator_;
     }
 
    private:
     Iterator(const Iterator& other)
           // The explicit constructor call suppresses a false warning
           // emitted by gcc when supplied with the -Wextra option.
         : ParamIteratorInterface<T>(),
           base_(other.base_),
           iterator_(other.iterator_) {}
 
     const ParamGeneratorInterface<T>* const base_;
     typename ContainerType::const_iterator iterator_;
     // A cached value of *iterator_. We keep it here to allow access by
     // pointer in the wrapping iterator's operator->().
     // value_ needs to be mutable to be accessed in Current().
     // Use of std::unique_ptr helps manage cached value's lifetime,
     // which is bound by the lifespan of the iterator itself.
     mutable std::unique_ptr<const T> value_;
   };  // class ValuesInIteratorRangeGenerator::Iterator
 
   // No implementation - assignment is unsupported.
   void operator=(const ValuesInIteratorRangeGenerator& other);
 
   const ContainerType container_;
 };  // class ValuesInIteratorRangeGenerator
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 //
 // Default parameterized test name generator, returns a string containing the
 // integer test parameter index.
 template <class ParamType>
 std::string DefaultParamName(const TestParamInfo<ParamType>& info) {
   Message name_stream;
   name_stream << info.index;
   return name_stream.GetString();
 }
 
 template <typename T = int>
 void TestNotEmpty() {
   static_assert(sizeof(T) == 0, "Empty arguments are not allowed.");
 }
 template <typename T = int>
 void TestNotEmpty(const T&) {}
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 //
 // Stores a parameter value and later creates tests parameterized with that
 // value.
 template <class TestClass>
 class ParameterizedTestFactory : public TestFactoryBase {
  public:
   typedef typename TestClass::ParamType ParamType;
   explicit ParameterizedTestFactory(ParamType parameter) :
       parameter_(parameter) {}
   Test* CreateTest() override {
     TestClass::SetParam(&parameter_);
     return new TestClass();
   }
 
  private:
   const ParamType parameter_;
 
   GTEST_DISALLOW_COPY_AND_ASSIGN_(ParameterizedTestFactory);
 };
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 //
 // TestMetaFactoryBase is a base class for meta-factories that create
 // test factories for passing into MakeAndRegisterTestInfo function.
 template <class ParamType>
 class TestMetaFactoryBase {
  public:
   virtual ~TestMetaFactoryBase() {}
 
   virtual TestFactoryBase* CreateTestFactory(ParamType parameter) = 0;
 };
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 //
 // TestMetaFactory creates test factories for passing into
 // MakeAndRegisterTestInfo function. Since MakeAndRegisterTestInfo receives
 // ownership of test factory pointer, same factory object cannot be passed
 // into that method twice. But ParameterizedTestSuiteInfo is going to call
 // it for each Test/Parameter value combination. Thus it needs meta factory
 // creator class.
 template <class TestSuite>
 class TestMetaFactory
     : public TestMetaFactoryBase<typename TestSuite::ParamType> {
  public:
   using ParamType = typename TestSuite::ParamType;
 
   TestMetaFactory() {}
 
   TestFactoryBase* CreateTestFactory(ParamType parameter) override {
     return new ParameterizedTestFactory<TestSuite>(parameter);
   }
 
  private:
   GTEST_DISALLOW_COPY_AND_ASSIGN_(TestMetaFactory);
 };
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 //
 // ParameterizedTestSuiteInfoBase is a generic interface
 // to ParameterizedTestSuiteInfo classes. ParameterizedTestSuiteInfoBase
 // accumulates test information provided by TEST_P macro invocations
 // and generators provided by INSTANTIATE_TEST_SUITE_P macro invocations
 // and uses that information to register all resulting test instances
 // in RegisterTests method. The ParameterizeTestSuiteRegistry class holds
 // a collection of pointers to the ParameterizedTestSuiteInfo objects
 // and calls RegisterTests() on each of them when asked.
 class ParameterizedTestSuiteInfoBase {
  public:
   virtual ~ParameterizedTestSuiteInfoBase() {}
 
   // Base part of test suite name for display purposes.
   virtual const std::string& GetTestSuiteName() const = 0;
   // Test case id to verify identity.
   virtual TypeId GetTestSuiteTypeId() const = 0;
   // UnitTest class invokes this method to register tests in this
   // test suite right before running them in RUN_ALL_TESTS macro.
   // This method should not be called more than once on any single
   // instance of a ParameterizedTestSuiteInfoBase derived class.
   virtual void RegisterTests() = 0;
 
  protected:
   ParameterizedTestSuiteInfoBase() {}
 
  private:
   GTEST_DISALLOW_COPY_AND_ASSIGN_(ParameterizedTestSuiteInfoBase);
 };
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 //
 // ParameterizedTestSuiteInfo accumulates tests obtained from TEST_P
 // macro invocations for a particular test suite and generators
 // obtained from INSTANTIATE_TEST_SUITE_P macro invocations for that
 // test suite. It registers tests with all values generated by all
 // generators when asked.
 template <class TestSuite>
 class ParameterizedTestSuiteInfo : public ParameterizedTestSuiteInfoBase {
  public:
   // ParamType and GeneratorCreationFunc are private types but are required
   // for declarations of public methods AddTestPattern() and
   // AddTestSuiteInstantiation().
   using ParamType = typename TestSuite::ParamType;
   // A function that returns an instance of appropriate generator type.
   typedef ParamGenerator<ParamType>(GeneratorCreationFunc)();
   using ParamNameGeneratorFunc = std::string(const TestParamInfo<ParamType>&);
 
   explicit ParameterizedTestSuiteInfo(const char* name,
                                       CodeLocation code_location)
       : test_suite_name_(name), code_location_(code_location) {}
 
   // Test case base name for display purposes.
   const std::string& GetTestSuiteName() const override {
     return test_suite_name_;
   }
   // Test case id to verify identity.
   TypeId GetTestSuiteTypeId() const override { return GetTypeId<TestSuite>(); }
   // TEST_P macro uses AddTestPattern() to record information
   // about a single test in a LocalTestInfo structure.
   // test_suite_name is the base name of the test suite (without invocation
   // prefix). test_base_name is the name of an individual test without
   // parameter index. For the test SequenceA/FooTest.DoBar/1 FooTest is
   // test suite base name and DoBar is test base name.
   void AddTestPattern(const char* test_suite_name, const char* test_base_name,
                       TestMetaFactoryBase<ParamType>* meta_factory) {
     tests_.push_back(std::shared_ptr<TestInfo>(
         new TestInfo(test_suite_name, test_base_name, meta_factory)));
   }
   // INSTANTIATE_TEST_SUITE_P macro uses AddGenerator() to record information
   // about a generator.
   int AddTestSuiteInstantiation(const std::string& instantiation_name,
                                 GeneratorCreationFunc* func,
                                 ParamNameGeneratorFunc* name_func,
                                 const char* file, int line) {
     instantiations_.push_back(
         InstantiationInfo(instantiation_name, func, name_func, file, line));
     return 0;  // Return value used only to run this method in namespace scope.
   }
   // UnitTest class invokes this method to register tests in this test suite
   // test suites right before running tests in RUN_ALL_TESTS macro.
   // This method should not be called more than once on any single
   // instance of a ParameterizedTestSuiteInfoBase derived class.
   // UnitTest has a guard to prevent from calling this method more than once.
   void RegisterTests() override {
     for (typename TestInfoContainer::iterator test_it = tests_.begin();
          test_it != tests_.end(); ++test_it) {
       std::shared_ptr<TestInfo> test_info = *test_it;
       for (typename InstantiationContainer::iterator gen_it =
                instantiations_.begin(); gen_it != instantiations_.end();
                ++gen_it) {
         const std::string& instantiation_name = gen_it->name;
         ParamGenerator<ParamType> generator((*gen_it->generator)());
         ParamNameGeneratorFunc* name_func = gen_it->name_func;
         const char* file = gen_it->file;
         int line = gen_it->line;
 
         std::string test_suite_name;
         if ( !instantiation_name.empty() )
           test_suite_name = instantiation_name + "/";
         test_suite_name += test_info->test_suite_base_name;
 
         size_t i = 0;
         std::set<std::string> test_param_names;
         for (typename ParamGenerator<ParamType>::iterator param_it =
                  generator.begin();
              param_it != generator.end(); ++param_it, ++i) {
           Message test_name_stream;
 
           std::string param_name = name_func(
               TestParamInfo<ParamType>(*param_it, i));
 
           GTEST_CHECK_(IsValidParamName(param_name))
               << "Parameterized test name '" << param_name
               << "' is invalid, in " << file
               << " line " << line << std::endl;
 
           GTEST_CHECK_(test_param_names.count(param_name) == 0)
               << "Duplicate parameterized test name '" << param_name
               << "', in " << file << " line " << line << std::endl;
 
           test_param_names.insert(param_name);
 
           if (!test_info->test_base_name.empty()) {
             test_name_stream << test_info->test_base_name << "/";
           }
           test_name_stream << param_name;
           MakeAndRegisterTestInfo(
               test_suite_name.c_str(), test_name_stream.GetString().c_str(),
               nullptr,  // No type parameter.
               PrintToString(*param_it).c_str(), code_location_,
               GetTestSuiteTypeId(),
               SuiteApiResolver<TestSuite>::GetSetUpCaseOrSuite(file, line),
               SuiteApiResolver<TestSuite>::GetTearDownCaseOrSuite(file, line),
               test_info->test_meta_factory->CreateTestFactory(*param_it));
         }  // for param_it
       }  // for gen_it
     }  // for test_it
   }    // RegisterTests
 
  private:
   // LocalTestInfo structure keeps information about a single test registered
   // with TEST_P macro.
   struct TestInfo {
     TestInfo(const char* a_test_suite_base_name, const char* a_test_base_name,
              TestMetaFactoryBase<ParamType>* a_test_meta_factory)
         : test_suite_base_name(a_test_suite_base_name),
           test_base_name(a_test_base_name),
           test_meta_factory(a_test_meta_factory) {}
 
     const std::string test_suite_base_name;
     const std::string test_base_name;
     const std::unique_ptr<TestMetaFactoryBase<ParamType> > test_meta_factory;
   };
   using TestInfoContainer = ::std::vector<std::shared_ptr<TestInfo> >;
   // Records data received from INSTANTIATE_TEST_SUITE_P macros:
   //  <Instantiation name, Sequence generator creation function,
   //     Name generator function, Source file, Source line>
   struct InstantiationInfo {
       InstantiationInfo(const std::string &name_in,
                         GeneratorCreationFunc* generator_in,
                         ParamNameGeneratorFunc* name_func_in,
                         const char* file_in,
                         int line_in)
           : name(name_in),
             generator(generator_in),
             name_func(name_func_in),
             file(file_in),
             line(line_in) {}
 
       std::string name;
       GeneratorCreationFunc* generator;
       ParamNameGeneratorFunc* name_func;
       const char* file;
       int line;
   };
   typedef ::std::vector<InstantiationInfo> InstantiationContainer;
 
   static bool IsValidParamName(const std::string& name) {
     // Check for empty string
     if (name.empty())
       return false;
 
     // Check for invalid characters
     for (std::string::size_type index = 0; index < name.size(); ++index) {
       if (!isalnum(name[index]) && name[index] != '_')
         return false;
     }
 
     return true;
   }
 
   const std::string test_suite_name_;
   CodeLocation code_location_;
   TestInfoContainer tests_;
   InstantiationContainer instantiations_;
 
   GTEST_DISALLOW_COPY_AND_ASSIGN_(ParameterizedTestSuiteInfo);
 };  // class ParameterizedTestSuiteInfo
 
 //  Legacy API is deprecated but still available
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 template <class TestCase>
 using ParameterizedTestCaseInfo = ParameterizedTestSuiteInfo<TestCase>;
 #endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 //
 // ParameterizedTestSuiteRegistry contains a map of
 // ParameterizedTestSuiteInfoBase classes accessed by test suite names. TEST_P
 // and INSTANTIATE_TEST_SUITE_P macros use it to locate their corresponding
 // ParameterizedTestSuiteInfo descriptors.
 class ParameterizedTestSuiteRegistry {
  public:
   ParameterizedTestSuiteRegistry() {}
   ~ParameterizedTestSuiteRegistry() {
     for (auto& test_suite_info : test_suite_infos_) {
       delete test_suite_info;
     }
   }
 
   // Looks up or creates and returns a structure containing information about
   // tests and instantiations of a particular test suite.
   template <class TestSuite>
   ParameterizedTestSuiteInfo<TestSuite>* GetTestSuitePatternHolder(
       const char* test_suite_name, CodeLocation code_location) {
     ParameterizedTestSuiteInfo<TestSuite>* typed_test_info = nullptr;
     for (auto& test_suite_info : test_suite_infos_) {
       if (test_suite_info->GetTestSuiteName() == test_suite_name) {
         if (test_suite_info->GetTestSuiteTypeId() != GetTypeId<TestSuite>()) {
           // Complain about incorrect usage of Google Test facilities
           // and terminate the program since we cannot guaranty correct
           // test suite setup and tear-down in this case.
           ReportInvalidTestSuiteType(test_suite_name, code_location);
           posix::Abort();
         } else {
           // At this point we are sure that the object we found is of the same
           // type we are looking for, so we downcast it to that type
           // without further checks.
           typed_test_info = CheckedDowncastToActualType<
               ParameterizedTestSuiteInfo<TestSuite> >(test_suite_info);
         }
         break;
       }
     }
     if (typed_test_info == nullptr) {
       typed_test_info = new ParameterizedTestSuiteInfo<TestSuite>(
           test_suite_name, code_location);
       test_suite_infos_.push_back(typed_test_info);
     }
     return typed_test_info;
   }
   void RegisterTests() {
     for (auto& test_suite_info : test_suite_infos_) {
       test_suite_info->RegisterTests();
     }
   }
 //  Legacy API is deprecated but still available
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   template <class TestCase>
   ParameterizedTestCaseInfo<TestCase>* GetTestCasePatternHolder(
       const char* test_case_name, CodeLocation code_location) {
     return GetTestSuitePatternHolder<TestCase>(test_case_name, code_location);
   }
 
 #endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
  private:
   using TestSuiteInfoContainer = ::std::vector<ParameterizedTestSuiteInfoBase*>;
 
   TestSuiteInfoContainer test_suite_infos_;
 
   GTEST_DISALLOW_COPY_AND_ASSIGN_(ParameterizedTestSuiteRegistry);
 };
 
 }  // namespace internal
 
 // Forward declarations of ValuesIn(), which is implemented in
 // include/gtest/gtest-param-test.h.
 template <class Container>
 internal::ParamGenerator<typename Container::value_type> ValuesIn(
     const Container& container);
 
 namespace internal {
 // Used in the Values() function to provide polymorphic capabilities.
 
 template <typename... Ts>
 class ValueArray {
  public:
   ValueArray(Ts... v) : v_{std::move(v)...} {}
 
   template <typename T>
   operator ParamGenerator<T>() const {  // NOLINT
     return ValuesIn(MakeVector<T>(MakeIndexSequence<sizeof...(Ts)>()));
   }
 
  private:
   template <typename T, size_t... I>
   std::vector<T> MakeVector(IndexSequence<I...>) const {
     return std::vector<T>{static_cast<T>(v_.template Get<I>())...};
   }
 
   FlatTuple<Ts...> v_;
 };
 
 template <typename... T>
 class CartesianProductGenerator
     : public ParamGeneratorInterface<::std::tuple<T...>> {
  public:
   typedef ::std::tuple<T...> ParamType;
 
   CartesianProductGenerator(const std::tuple<ParamGenerator<T>...>& g)
       : generators_(g) {}
   ~CartesianProductGenerator() override {}
 
   ParamIteratorInterface<ParamType>* Begin() const override {
     return new Iterator(this, generators_, false);
   }
   ParamIteratorInterface<ParamType>* End() const override {
     return new Iterator(this, generators_, true);
   }
 
  private:
   template <class I>
   class IteratorImpl;
   template <size_t... I>
   class IteratorImpl<IndexSequence<I...>>
       : public ParamIteratorInterface<ParamType> {
    public:
     IteratorImpl(const ParamGeneratorInterface<ParamType>* base,
              const std::tuple<ParamGenerator<T>...>& generators, bool is_end)
         : base_(base),
           begin_(std::get<I>(generators).begin()...),
           end_(std::get<I>(generators).end()...),
           current_(is_end ? end_ : begin_) {
       ComputeCurrentValue();
     }
     ~IteratorImpl() override {}
 
     const ParamGeneratorInterface<ParamType>* BaseGenerator() const override {
       return base_;
     }
     // Advance should not be called on beyond-of-range iterators
     // so no component iterators must be beyond end of range, either.
     void Advance() override {
       assert(!AtEnd());
       // Advance the last iterator.
       ++std::get<sizeof...(T) - 1>(current_);
       // if that reaches end, propagate that up.
       AdvanceIfEnd<sizeof...(T) - 1>();
       ComputeCurrentValue();
     }
     ParamIteratorInterface<ParamType>* Clone() const override {
       return new IteratorImpl(*this);
     }
 
     const ParamType* Current() const override { return current_value_.get(); }
 
     bool Equals(const ParamIteratorInterface<ParamType>& other) const override {
       // Having the same base generator guarantees that the other
       // iterator is of the same type and we can downcast.
       GTEST_CHECK_(BaseGenerator() == other.BaseGenerator())
           << "The program attempted to compare iterators "
           << "from different generators." << std::endl;
       const IteratorImpl* typed_other =
           CheckedDowncastToActualType<const IteratorImpl>(&other);
 
       // We must report iterators equal if they both point beyond their
       // respective ranges. That can happen in a variety of fashions,
       // so we have to consult AtEnd().
       if (AtEnd() && typed_other->AtEnd()) return true;
 
       bool same = true;
       bool dummy[] = {
           (same = same && std::get<I>(current_) ==
                               std::get<I>(typed_other->current_))...};
       (void)dummy;
       return same;
     }
 
    private:
     template <size_t ThisI>
     void AdvanceIfEnd() {
       if (std::get<ThisI>(current_) != std::get<ThisI>(end_)) return;
 
       bool last = ThisI == 0;
       if (last) {
         // We are done. Nothing else to propagate.
         return;
       }
 
       constexpr size_t NextI = ThisI - (ThisI != 0);
       std::get<ThisI>(current_) = std::get<ThisI>(begin_);
       ++std::get<NextI>(current_);
       AdvanceIfEnd<NextI>();
     }
 
     void ComputeCurrentValue() {
       if (!AtEnd())
         current_value_ = std::make_shared<ParamType>(*std::get<I>(current_)...);
     }
     bool AtEnd() const {
       bool at_end = false;
       bool dummy[] = {
           (at_end = at_end || std::get<I>(current_) == std::get<I>(end_))...};
       (void)dummy;
       return at_end;
     }
 
     const ParamGeneratorInterface<ParamType>* const base_;
     std::tuple<typename ParamGenerator<T>::iterator...> begin_;
     std::tuple<typename ParamGenerator<T>::iterator...> end_;
     std::tuple<typename ParamGenerator<T>::iterator...> current_;
     std::shared_ptr<ParamType> current_value_;
   };
 
   using Iterator = IteratorImpl<typename MakeIndexSequence<sizeof...(T)>::type>;
 
   std::tuple<ParamGenerator<T>...> generators_;
 };
 
 template <class... Gen>
 class CartesianProductHolder {
  public:
   CartesianProductHolder(const Gen&... g) : generators_(g...) {}
   template <typename... T>
   operator ParamGenerator<::std::tuple<T...>>() const {
     return ParamGenerator<::std::tuple<T...>>(
         new CartesianProductGenerator<T...>(generators_));
   }
 
  private:
   std::tuple<Gen...> generators_;
 };
 
 }  // namespace internal
 }  // namespace testing
 
 #endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PARAM_UTIL_H_