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1 // Copyright 2008 Google Inc.
2 // All Rights Reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 //     * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 //     * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 //     * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 //
30 // Author: vladl@google.com (Vlad Losev)
31 
32 // Type and function utilities for implementing parameterized tests.
33 
34 #ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PARAM_UTIL_H_
35 #define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PARAM_UTIL_H_
36 
37 #include <iterator>
38 #include <utility>
39 #include <vector>
40 
41 // scripts/fuse_gtest.py depends on gtest's own header being #included
42 // *unconditionally*.  Therefore these #includes cannot be moved
43 // inside #if GTEST_HAS_PARAM_TEST.
44 #include "gtest/internal/gtest-internal.h"
45 #include "gtest/internal/gtest-linked_ptr.h"
46 #include "gtest/internal/gtest-port.h"
47 #include "gtest/gtest-printers.h"
48 
49 #if GTEST_HAS_PARAM_TEST
50 
51 namespace testing {
52 namespace internal {
53 
54 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
55 //
56 // Outputs a message explaining invalid registration of different
57 // fixture class for the same test case. This may happen when
58 // TEST_P macro is used to define two tests with the same name
59 // but in different namespaces.
60 GTEST_API_ void ReportInvalidTestCaseType(const char* test_case_name,
61                                           const char* file, int line);
62 
63 template <typename> class ParamGeneratorInterface;
64 template <typename> class ParamGenerator;
65 
66 // Interface for iterating over elements provided by an implementation
67 // of ParamGeneratorInterface<T>.
68 template <typename T>
69 class ParamIteratorInterface {
70  public:
~ParamIteratorInterface()71   virtual ~ParamIteratorInterface() {}
72   // A pointer to the base generator instance.
73   // Used only for the purposes of iterator comparison
74   // to make sure that two iterators belong to the same generator.
75   virtual const ParamGeneratorInterface<T>* BaseGenerator() const = 0;
76   // Advances iterator to point to the next element
77   // provided by the generator. The caller is responsible
78   // for not calling Advance() on an iterator equal to
79   // BaseGenerator()->End().
80   virtual void Advance() = 0;
81   // Clones the iterator object. Used for implementing copy semantics
82   // of ParamIterator<T>.
83   virtual ParamIteratorInterface* Clone() const = 0;
84   // Dereferences the current iterator and provides (read-only) access
85   // to the pointed value. It is the caller's responsibility not to call
86   // Current() on an iterator equal to BaseGenerator()->End().
87   // Used for implementing ParamGenerator<T>::operator*().
88   virtual const T* Current() const = 0;
89   // Determines whether the given iterator and other point to the same
90   // element in the sequence generated by the generator.
91   // Used for implementing ParamGenerator<T>::operator==().
92   virtual bool Equals(const ParamIteratorInterface& other) const = 0;
93 };
94 
95 // Class iterating over elements provided by an implementation of
96 // ParamGeneratorInterface<T>. It wraps ParamIteratorInterface<T>
97 // and implements the const forward iterator concept.
98 template <typename T>
99 class ParamIterator {
100  public:
101   typedef T value_type;
102   typedef const T& reference;
103   typedef ptrdiff_t difference_type;
104 
105   // ParamIterator assumes ownership of the impl_ pointer.
ParamIterator(const ParamIterator & other)106   ParamIterator(const ParamIterator& other) : impl_(other.impl_->Clone()) {}
107   ParamIterator& operator=(const ParamIterator& other) {
108     if (this != &other)
109       impl_.reset(other.impl_->Clone());
110     return *this;
111   }
112 
113   const T& operator*() const { return *impl_->Current(); }
114   const T* operator->() const { return impl_->Current(); }
115   // Prefix version of operator++.
116   ParamIterator& operator++() {
117     impl_->Advance();
118     return *this;
119   }
120   // Postfix version of operator++.
121   ParamIterator operator++(int /*unused*/) {
122     ParamIteratorInterface<T>* clone = impl_->Clone();
123     impl_->Advance();
124     return ParamIterator(clone);
125   }
126   bool operator==(const ParamIterator& other) const {
127     return impl_.get() == other.impl_.get() || impl_->Equals(*other.impl_);
128   }
129   bool operator!=(const ParamIterator& other) const {
130     return !(*this == other);
131   }
132 
133  private:
134   friend class ParamGenerator<T>;
ParamIterator(ParamIteratorInterface<T> * impl)135   explicit ParamIterator(ParamIteratorInterface<T>* impl) : impl_(impl) {}
136   scoped_ptr<ParamIteratorInterface<T> > impl_;
137 };
138 
139 // ParamGeneratorInterface<T> is the binary interface to access generators
140 // defined in other translation units.
141 template <typename T>
142 class ParamGeneratorInterface {
143  public:
144   typedef T ParamType;
145 
~ParamGeneratorInterface()146   virtual ~ParamGeneratorInterface() {}
147 
148   // Generator interface definition
149   virtual ParamIteratorInterface<T>* Begin() const = 0;
150   virtual ParamIteratorInterface<T>* End() const = 0;
151 };
152 
153 // Wraps ParamGeneratorInterface<T> and provides general generator syntax
154 // compatible with the STL Container concept.
155 // This class implements copy initialization semantics and the contained
156 // ParamGeneratorInterface<T> instance is shared among all copies
157 // of the original object. This is possible because that instance is immutable.
158 template<typename T>
159 class ParamGenerator {
160  public:
161   typedef ParamIterator<T> iterator;
162 
ParamGenerator(ParamGeneratorInterface<T> * impl)163   explicit ParamGenerator(ParamGeneratorInterface<T>* impl) : impl_(impl) {}
ParamGenerator(const ParamGenerator & other)164   ParamGenerator(const ParamGenerator& other) : impl_(other.impl_) {}
165 
166   ParamGenerator& operator=(const ParamGenerator& other) {
167     impl_ = other.impl_;
168     return *this;
169   }
170 
begin()171   iterator begin() const { return iterator(impl_->Begin()); }
end()172   iterator end() const { return iterator(impl_->End()); }
173 
174  private:
175   linked_ptr<const ParamGeneratorInterface<T> > impl_;
176 };
177 
178 // Generates values from a range of two comparable values. Can be used to
179 // generate sequences of user-defined types that implement operator+() and
180 // operator<().
181 // This class is used in the Range() function.
182 template <typename T, typename IncrementT>
183 class RangeGenerator : public ParamGeneratorInterface<T> {
184  public:
RangeGenerator(T begin,T end,IncrementT step)185   RangeGenerator(T begin, T end, IncrementT step)
186       : begin_(begin), end_(end),
187         step_(step), end_index_(CalculateEndIndex(begin, end, step)) {}
~RangeGenerator()188   virtual ~RangeGenerator() {}
189 
Begin()190   virtual ParamIteratorInterface<T>* Begin() const {
191     return new Iterator(this, begin_, 0, step_);
192   }
End()193   virtual ParamIteratorInterface<T>* End() const {
194     return new Iterator(this, end_, end_index_, step_);
195   }
196 
197  private:
198   class Iterator : public ParamIteratorInterface<T> {
199    public:
Iterator(const ParamGeneratorInterface<T> * base,T value,int index,IncrementT step)200     Iterator(const ParamGeneratorInterface<T>* base, T value, int index,
201              IncrementT step)
202         : base_(base), value_(value), index_(index), step_(step) {}
~Iterator()203     virtual ~Iterator() {}
204 
BaseGenerator()205     virtual const ParamGeneratorInterface<T>* BaseGenerator() const {
206       return base_;
207     }
Advance()208     virtual void Advance() {
209       value_ = value_ + step_;
210       index_++;
211     }
Clone()212     virtual ParamIteratorInterface<T>* Clone() const {
213       return new Iterator(*this);
214     }
Current()215     virtual const T* Current() const { return &value_; }
Equals(const ParamIteratorInterface<T> & other)216     virtual bool Equals(const ParamIteratorInterface<T>& other) const {
217       // Having the same base generator guarantees that the other
218       // iterator is of the same type and we can downcast.
219       GTEST_CHECK_(BaseGenerator() == other.BaseGenerator())
220           << "The program attempted to compare iterators "
221           << "from different generators." << std::endl;
222       const int other_index =
223           CheckedDowncastToActualType<const Iterator>(&other)->index_;
224       return index_ == other_index;
225     }
226 
227    private:
Iterator(const Iterator & other)228     Iterator(const Iterator& other)
229         : ParamIteratorInterface<T>(),
230           base_(other.base_), value_(other.value_), index_(other.index_),
231           step_(other.step_) {}
232 
233     // No implementation - assignment is unsupported.
234     void operator=(const Iterator& other);
235 
236     const ParamGeneratorInterface<T>* const base_;
237     T value_;
238     int index_;
239     const IncrementT step_;
240   };  // class RangeGenerator::Iterator
241 
CalculateEndIndex(const T & begin,const T & end,const IncrementT & step)242   static int CalculateEndIndex(const T& begin,
243                                const T& end,
244                                const IncrementT& step) {
245     int end_index = 0;
246     for (T i = begin; i < end; i = i + step)
247       end_index++;
248     return end_index;
249   }
250 
251   // No implementation - assignment is unsupported.
252   void operator=(const RangeGenerator& other);
253 
254   const T begin_;
255   const T end_;
256   const IncrementT step_;
257   // The index for the end() iterator. All the elements in the generated
258   // sequence are indexed (0-based) to aid iterator comparison.
259   const int end_index_;
260 };  // class RangeGenerator
261 
262 
263 // Generates values from a pair of STL-style iterators. Used in the
264 // ValuesIn() function. The elements are copied from the source range
265 // since the source can be located on the stack, and the generator
266 // is likely to persist beyond that stack frame.
267 template <typename T>
268 class ValuesInIteratorRangeGenerator : public ParamGeneratorInterface<T> {
269  public:
270   template <typename ForwardIterator>
ValuesInIteratorRangeGenerator(ForwardIterator begin,ForwardIterator end)271   ValuesInIteratorRangeGenerator(ForwardIterator begin, ForwardIterator end)
272       : container_(begin, end) {}
~ValuesInIteratorRangeGenerator()273   virtual ~ValuesInIteratorRangeGenerator() {}
274 
Begin()275   virtual ParamIteratorInterface<T>* Begin() const {
276     return new Iterator(this, container_.begin());
277   }
End()278   virtual ParamIteratorInterface<T>* End() const {
279     return new Iterator(this, container_.end());
280   }
281 
282  private:
283   typedef typename ::std::vector<T> ContainerType;
284 
285   class Iterator : public ParamIteratorInterface<T> {
286    public:
Iterator(const ParamGeneratorInterface<T> * base,typename ContainerType::const_iterator iterator)287     Iterator(const ParamGeneratorInterface<T>* base,
288              typename ContainerType::const_iterator iterator)
289         : base_(base), iterator_(iterator) {}
~Iterator()290     virtual ~Iterator() {}
291 
BaseGenerator()292     virtual const ParamGeneratorInterface<T>* BaseGenerator() const {
293       return base_;
294     }
Advance()295     virtual void Advance() {
296       ++iterator_;
297       value_.reset();
298     }
Clone()299     virtual ParamIteratorInterface<T>* Clone() const {
300       return new Iterator(*this);
301     }
302     // We need to use cached value referenced by iterator_ because *iterator_
303     // can return a temporary object (and of type other then T), so just
304     // having "return &*iterator_;" doesn't work.
305     // value_ is updated here and not in Advance() because Advance()
306     // can advance iterator_ beyond the end of the range, and we cannot
307     // detect that fact. The client code, on the other hand, is
308     // responsible for not calling Current() on an out-of-range iterator.
Current()309     virtual const T* Current() const {
310       if (value_.get() == NULL)
311         value_.reset(new T(*iterator_));
312       return value_.get();
313     }
Equals(const ParamIteratorInterface<T> & other)314     virtual bool Equals(const ParamIteratorInterface<T>& other) const {
315       // Having the same base generator guarantees that the other
316       // iterator is of the same type and we can downcast.
317       GTEST_CHECK_(BaseGenerator() == other.BaseGenerator())
318           << "The program attempted to compare iterators "
319           << "from different generators." << std::endl;
320       return iterator_ ==
321           CheckedDowncastToActualType<const Iterator>(&other)->iterator_;
322     }
323 
324    private:
Iterator(const Iterator & other)325     Iterator(const Iterator& other)
326           // The explicit constructor call suppresses a false warning
327           // emitted by gcc when supplied with the -Wextra option.
328         : ParamIteratorInterface<T>(),
329           base_(other.base_),
330           iterator_(other.iterator_) {}
331 
332     const ParamGeneratorInterface<T>* const base_;
333     typename ContainerType::const_iterator iterator_;
334     // A cached value of *iterator_. We keep it here to allow access by
335     // pointer in the wrapping iterator's operator->().
336     // value_ needs to be mutable to be accessed in Current().
337     // Use of scoped_ptr helps manage cached value's lifetime,
338     // which is bound by the lifespan of the iterator itself.
339     mutable scoped_ptr<const T> value_;
340   };  // class ValuesInIteratorRangeGenerator::Iterator
341 
342   // No implementation - assignment is unsupported.
343   void operator=(const ValuesInIteratorRangeGenerator& other);
344 
345   const ContainerType container_;
346 };  // class ValuesInIteratorRangeGenerator
347 
348 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
349 //
350 // Stores a parameter value and later creates tests parameterized with that
351 // value.
352 template <class TestClass>
353 class ParameterizedTestFactory : public TestFactoryBase {
354  public:
355   typedef typename TestClass::ParamType ParamType;
ParameterizedTestFactory(ParamType parameter)356   explicit ParameterizedTestFactory(ParamType parameter) :
357       parameter_(parameter) {}
CreateTest()358   virtual Test* CreateTest() {
359     TestClass::SetParam(&parameter_);
360     return new TestClass();
361   }
362 
363  private:
364   const ParamType parameter_;
365 
366   GTEST_DISALLOW_COPY_AND_ASSIGN_(ParameterizedTestFactory);
367 };
368 
369 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
370 //
371 // TestMetaFactoryBase is a base class for meta-factories that create
372 // test factories for passing into MakeAndRegisterTestInfo function.
373 template <class ParamType>
374 class TestMetaFactoryBase {
375  public:
~TestMetaFactoryBase()376   virtual ~TestMetaFactoryBase() {}
377 
378   virtual TestFactoryBase* CreateTestFactory(ParamType parameter) = 0;
379 };
380 
381 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
382 //
383 // TestMetaFactory creates test factories for passing into
384 // MakeAndRegisterTestInfo function. Since MakeAndRegisterTestInfo receives
385 // ownership of test factory pointer, same factory object cannot be passed
386 // into that method twice. But ParameterizedTestCaseInfo is going to call
387 // it for each Test/Parameter value combination. Thus it needs meta factory
388 // creator class.
389 template <class TestCase>
390 class TestMetaFactory
391     : public TestMetaFactoryBase<typename TestCase::ParamType> {
392  public:
393   typedef typename TestCase::ParamType ParamType;
394 
TestMetaFactory()395   TestMetaFactory() {}
396 
CreateTestFactory(ParamType parameter)397   virtual TestFactoryBase* CreateTestFactory(ParamType parameter) {
398     return new ParameterizedTestFactory<TestCase>(parameter);
399   }
400 
401  private:
402   GTEST_DISALLOW_COPY_AND_ASSIGN_(TestMetaFactory);
403 };
404 
405 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
406 //
407 // ParameterizedTestCaseInfoBase is a generic interface
408 // to ParameterizedTestCaseInfo classes. ParameterizedTestCaseInfoBase
409 // accumulates test information provided by TEST_P macro invocations
410 // and generators provided by INSTANTIATE_TEST_CASE_P macro invocations
411 // and uses that information to register all resulting test instances
412 // in RegisterTests method. The ParameterizeTestCaseRegistry class holds
413 // a collection of pointers to the ParameterizedTestCaseInfo objects
414 // and calls RegisterTests() on each of them when asked.
415 class ParameterizedTestCaseInfoBase {
416  public:
~ParameterizedTestCaseInfoBase()417   virtual ~ParameterizedTestCaseInfoBase() {}
418 
419   // Base part of test case name for display purposes.
420   virtual const string& GetTestCaseName() const = 0;
421   // Test case id to verify identity.
422   virtual TypeId GetTestCaseTypeId() const = 0;
423   // UnitTest class invokes this method to register tests in this
424   // test case right before running them in RUN_ALL_TESTS macro.
425   // This method should not be called more then once on any single
426   // instance of a ParameterizedTestCaseInfoBase derived class.
427   virtual void RegisterTests() = 0;
428 
429  protected:
ParameterizedTestCaseInfoBase()430   ParameterizedTestCaseInfoBase() {}
431 
432  private:
433   GTEST_DISALLOW_COPY_AND_ASSIGN_(ParameterizedTestCaseInfoBase);
434 };
435 
436 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
437 //
438 // ParameterizedTestCaseInfo accumulates tests obtained from TEST_P
439 // macro invocations for a particular test case and generators
440 // obtained from INSTANTIATE_TEST_CASE_P macro invocations for that
441 // test case. It registers tests with all values generated by all
442 // generators when asked.
443 template <class TestCase>
444 class ParameterizedTestCaseInfo : public ParameterizedTestCaseInfoBase {
445  public:
446   // ParamType and GeneratorCreationFunc are private types but are required
447   // for declarations of public methods AddTestPattern() and
448   // AddTestCaseInstantiation().
449   typedef typename TestCase::ParamType ParamType;
450   // A function that returns an instance of appropriate generator type.
451   typedef ParamGenerator<ParamType>(GeneratorCreationFunc)();
452 
ParameterizedTestCaseInfo(const char * name)453   explicit ParameterizedTestCaseInfo(const char* name)
454       : test_case_name_(name) {}
455 
456   // Test case base name for display purposes.
GetTestCaseName()457   virtual const string& GetTestCaseName() const { return test_case_name_; }
458   // Test case id to verify identity.
GetTestCaseTypeId()459   virtual TypeId GetTestCaseTypeId() const { return GetTypeId<TestCase>(); }
460   // TEST_P macro uses AddTestPattern() to record information
461   // about a single test in a LocalTestInfo structure.
462   // test_case_name is the base name of the test case (without invocation
463   // prefix). test_base_name is the name of an individual test without
464   // parameter index. For the test SequenceA/FooTest.DoBar/1 FooTest is
465   // test case base name and DoBar is test base name.
AddTestPattern(const char * test_case_name,const char * test_base_name,TestMetaFactoryBase<ParamType> * meta_factory)466   void AddTestPattern(const char* test_case_name,
467                       const char* test_base_name,
468                       TestMetaFactoryBase<ParamType>* meta_factory) {
469     tests_.push_back(linked_ptr<TestInfo>(new TestInfo(test_case_name,
470                                                        test_base_name,
471                                                        meta_factory)));
472   }
473   // INSTANTIATE_TEST_CASE_P macro uses AddGenerator() to record information
474   // about a generator.
AddTestCaseInstantiation(const string & instantiation_name,GeneratorCreationFunc * func,const char *,int)475   int AddTestCaseInstantiation(const string& instantiation_name,
476                                GeneratorCreationFunc* func,
477                                const char* /* file */,
478                                int /* line */) {
479     instantiations_.push_back(::std::make_pair(instantiation_name, func));
480     return 0;  // Return value used only to run this method in namespace scope.
481   }
482   // UnitTest class invokes this method to register tests in this test case
483   // test cases right before running tests in RUN_ALL_TESTS macro.
484   // This method should not be called more then once on any single
485   // instance of a ParameterizedTestCaseInfoBase derived class.
486   // UnitTest has a guard to prevent from calling this method more then once.
RegisterTests()487   virtual void RegisterTests() {
488     for (typename TestInfoContainer::iterator test_it = tests_.begin();
489          test_it != tests_.end(); ++test_it) {
490       linked_ptr<TestInfo> test_info = *test_it;
491       for (typename InstantiationContainer::iterator gen_it =
492                instantiations_.begin(); gen_it != instantiations_.end();
493                ++gen_it) {
494         const string& instantiation_name = gen_it->first;
495         ParamGenerator<ParamType> generator((*gen_it->second)());
496 
497         string test_case_name;
498         if ( !instantiation_name.empty() )
499           test_case_name = instantiation_name + "/";
500         test_case_name += test_info->test_case_base_name;
501 
502         int i = 0;
503         for (typename ParamGenerator<ParamType>::iterator param_it =
504                  generator.begin();
505              param_it != generator.end(); ++param_it, ++i) {
506           Message test_name_stream;
507           test_name_stream << test_info->test_base_name << "/" << i;
508           MakeAndRegisterTestInfo(
509               test_case_name.c_str(),
510               test_name_stream.GetString().c_str(),
511               NULL,  // No type parameter.
512               PrintToString(*param_it).c_str(),
513               GetTestCaseTypeId(),
514               TestCase::SetUpTestCase,
515               TestCase::TearDownTestCase,
516               test_info->test_meta_factory->CreateTestFactory(*param_it));
517         }  // for param_it
518       }  // for gen_it
519     }  // for test_it
520   }  // RegisterTests
521 
522  private:
523   // LocalTestInfo structure keeps information about a single test registered
524   // with TEST_P macro.
525   struct TestInfo {
TestInfoTestInfo526     TestInfo(const char* a_test_case_base_name,
527              const char* a_test_base_name,
528              TestMetaFactoryBase<ParamType>* a_test_meta_factory) :
529         test_case_base_name(a_test_case_base_name),
530         test_base_name(a_test_base_name),
531         test_meta_factory(a_test_meta_factory) {}
532 
533     const string test_case_base_name;
534     const string test_base_name;
535     const scoped_ptr<TestMetaFactoryBase<ParamType> > test_meta_factory;
536   };
537   typedef ::std::vector<linked_ptr<TestInfo> > TestInfoContainer;
538   // Keeps pairs of <Instantiation name, Sequence generator creation function>
539   // received from INSTANTIATE_TEST_CASE_P macros.
540   typedef ::std::vector<std::pair<string, GeneratorCreationFunc*> >
541       InstantiationContainer;
542 
543   const string test_case_name_;
544   TestInfoContainer tests_;
545   InstantiationContainer instantiations_;
546 
547   GTEST_DISALLOW_COPY_AND_ASSIGN_(ParameterizedTestCaseInfo);
548 };  // class ParameterizedTestCaseInfo
549 
550 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
551 //
552 // ParameterizedTestCaseRegistry contains a map of ParameterizedTestCaseInfoBase
553 // classes accessed by test case names. TEST_P and INSTANTIATE_TEST_CASE_P
554 // macros use it to locate their corresponding ParameterizedTestCaseInfo
555 // descriptors.
556 class ParameterizedTestCaseRegistry {
557  public:
ParameterizedTestCaseRegistry()558   ParameterizedTestCaseRegistry() {}
~ParameterizedTestCaseRegistry()559   ~ParameterizedTestCaseRegistry() {
560     for (TestCaseInfoContainer::iterator it = test_case_infos_.begin();
561          it != test_case_infos_.end(); ++it) {
562       delete *it;
563     }
564   }
565 
566   // Looks up or creates and returns a structure containing information about
567   // tests and instantiations of a particular test case.
568   template <class TestCase>
GetTestCasePatternHolder(const char * test_case_name,const char * file,int line)569   ParameterizedTestCaseInfo<TestCase>* GetTestCasePatternHolder(
570       const char* test_case_name,
571       const char* file,
572       int line) {
573     ParameterizedTestCaseInfo<TestCase>* typed_test_info = NULL;
574     for (TestCaseInfoContainer::iterator it = test_case_infos_.begin();
575          it != test_case_infos_.end(); ++it) {
576       if ((*it)->GetTestCaseName() == test_case_name) {
577         if ((*it)->GetTestCaseTypeId() != GetTypeId<TestCase>()) {
578           // Complain about incorrect usage of Google Test facilities
579           // and terminate the program since we cannot guaranty correct
580           // test case setup and tear-down in this case.
581           ReportInvalidTestCaseType(test_case_name,  file, line);
582           posix::Abort();
583         } else {
584           // At this point we are sure that the object we found is of the same
585           // type we are looking for, so we downcast it to that type
586           // without further checks.
587           typed_test_info = CheckedDowncastToActualType<
588               ParameterizedTestCaseInfo<TestCase> >(*it);
589         }
590         break;
591       }
592     }
593     if (typed_test_info == NULL) {
594       typed_test_info = new ParameterizedTestCaseInfo<TestCase>(test_case_name);
595       test_case_infos_.push_back(typed_test_info);
596     }
597     return typed_test_info;
598   }
RegisterTests()599   void RegisterTests() {
600     for (TestCaseInfoContainer::iterator it = test_case_infos_.begin();
601          it != test_case_infos_.end(); ++it) {
602       (*it)->RegisterTests();
603     }
604   }
605 
606  private:
607   typedef ::std::vector<ParameterizedTestCaseInfoBase*> TestCaseInfoContainer;
608 
609   TestCaseInfoContainer test_case_infos_;
610 
611   GTEST_DISALLOW_COPY_AND_ASSIGN_(ParameterizedTestCaseRegistry);
612 };
613 
614 }  // namespace internal
615 }  // namespace testing
616 
617 #endif  //  GTEST_HAS_PARAM_TEST
618 
619 #endif  // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_PARAM_UTIL_H_
620