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// Copyright 2005, 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.

//

// Authors: wan@google.com (Zhanyong Wan), eefacm@gmail.com (Sean Mcafee)

//

// The Google C++ Testing Framework (Google Test)

//

// This header file declares functions and macros used internally by

// Google Test.  They are subject to change without notice.

#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_INTERNAL_H_

#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_INTERNAL_H_

#include "gtest/internal/gtest-port.h"

#if GTEST_OS_LINUX

# include <stdlib.h>

# include <sys/types.h>

# include <sys/wait.h>

# include <unistd.h>

#endif  // GTEST_OS_LINUX

#if GTEST_HAS_EXCEPTIONS

# include <stdexcept>

#endif

#include <ctype.h>

#include <float.h>

#include <string.h>

#include <iomanip>

#include <limits>

#include <map>

#include <set>

#include <string>

#include <vector>

#include "gtest/gtest-message.h"

#include "gtest/internal/gtest-string.h"

#include "gtest/internal/gtest-filepath.h"

#include "gtest/internal/gtest-type-util.h"

// Due to C++ preprocessor weirdness, we need double indirection to

// concatenate two tokens when one of them is __LINE__.  Writing

//

//   foo ## __LINE__

//

// will result in the token foo__LINE__, instead of foo followed by

// the current line number.  For more details, see

// http://www.parashift.com/c++-faq-lite/misc-technical-issues.html#faq-39.6

#define GTEST_CONCAT_TOKEN_(foo, bar) GTEST_CONCAT_TOKEN_IMPL_(foo, bar)

#define GTEST_CONCAT_TOKEN_IMPL_(foo, bar) foo ## bar

class ProtocolMessage;

namespace proto2 { class Message; }

namespace testing {

// Forward declarations.

class AssertionResult;                 // Result of an assertion.

class Message;                         // Represents a failure message.

class Test;                            // Represents a test.

class TestInfo;                        // Information about a test.

class TestPartResult;                  // Result of a test part.

class UnitTest;                        // A collection of test cases.

template <typename T>

::std::string PrintToString(const T& value);

namespace internal {

struct TraceInfo;                      // Information about a trace point.

class ScopedTrace;                     // Implements scoped trace.

class TestInfoImpl;                    // Opaque implementation of TestInfo

class UnitTestImpl;                    // Opaque implementation of UnitTest

// The text used in failure messages to indicate the start of the

// stack trace.

GTEST_API_ extern const char kStackTraceMarker[];

// Two overloaded helpers for checking at compile time whether an

// expression is a null pointer literal (i.e. NULL or any 0-valued

// compile-time integral constant).  Their return values have

// different sizes, so we can use sizeof() to test which version is

// picked by the compiler.  These helpers have no implementations, as

// we only need their signatures.

//

// Given IsNullLiteralHelper(x), the compiler will pick the first

// version if x can be implicitly converted to Secret*, and pick the

// second version otherwise.  Since Secret is a secret and incomplete

// type, the only expression a user can write that has type Secret* is

// a null pointer literal.  Therefore, we know that x is a null

// pointer literal if and only if the first version is picked by the

// compiler.

char IsNullLiteralHelper(Secret* p);

char (&IsNullLiteralHelper(...))[2];  // NOLINT

// A compile-time bool constant that is true if and only if x is a

// null pointer literal (i.e. NULL or any 0-valued compile-time

// integral constant).

#ifdef GTEST_ELLIPSIS_NEEDS_POD_

// We lose support for NULL detection where the compiler doesn't like

// passing non-POD classes through ellipsis (...).

# define GTEST_IS_NULL_LITERAL_(x) false

#else

# define GTEST_IS_NULL_LITERAL_(x) \

    (sizeof(::testing::internal::IsNullLiteralHelper(x)) == 1)

#endif  // GTEST_ELLIPSIS_NEEDS_POD_

// Appends the user-supplied message to the Google-Test-generated message.

GTEST_API_ std::string AppendUserMessage(

    const std::string& gtest_msg, const Message& user_msg);

#if GTEST_HAS_EXCEPTIONS

// This exception is thrown by (and only by) a failed Google Test

// assertion when GTEST_FLAG(throw_on_failure) is true (if exceptions

// are enabled).  We derive it from std::runtime_error, which is for

// errors presumably detectable only at run time.  Since

// std::runtime_error inherits from std::exception, many testing

// frameworks know how to extract and print the message inside it.

class GTEST_API_ GoogleTestFailureException : public ::std::runtime_error {

 public:

  explicit GoogleTestFailureException(const TestPartResult& failure);

};

#endif  // GTEST_HAS_EXCEPTIONS

// A helper class for creating scoped traces in user programs.

class GTEST_API_ ScopedTrace {

 public:

  // The c'tor pushes the given source file location and message onto

  // a trace stack maintained by Google Test.

  ScopedTrace(const char* file, int line, const Message& message);

  // The d'tor pops the info pushed by the c'tor.

  //

  // Note that the d'tor is not virtual in order to be efficient.

  // Don't inherit from ScopedTrace!

  ~ScopedTrace();

 private:

  GTEST_DISALLOW_COPY_AND_ASSIGN_(ScopedTrace);

} GTEST_ATTRIBUTE_UNUSED_;  // A ScopedTrace object does its job in its

                            // c'tor and d'tor.  Therefore it doesn't

                            // need to be used otherwise.

namespace edit_distance {

// Returns the optimal edits to go from 'left' to 'right'.

// All edits cost the same, with replace having lower priority than

// add/remove.

// Simple implementation of the Wagner–Fischer algorithm.

// See http://en.wikipedia.org/wiki/Wagner-Fischer_algorithm

enum EditType { kMatch, kAdd, kRemove, kReplace };

GTEST_API_ std::vector<EditType> CalculateOptimalEdits(

    const std::vector<size_t>& left, const std::vector<size_t>& right);

// Same as above, but the input is represented as strings.

GTEST_API_ std::vector<EditType> CalculateOptimalEdits(

    const std::vector<std::string>& left,

    const std::vector<std::string>& right);

// Create a diff of the input strings in Unified diff format.

GTEST_API_ std::string CreateUnifiedDiff(const std::vector<std::string>& left,

                                         const std::vector<std::string>& right,

                                         size_t context = 2);

}  // namespace edit_distance

// Calculate the diff between 'left' and 'right' and return it in unified diff

// format.

// If not null, stores in 'total_line_count' the total number of lines found

// in left + right.

GTEST_API_ std::string DiffStrings(const std::string& left,

                                   const std::string& right,

                                   size_t* total_line_count);

// Constructs and returns the message for an equality assertion

// (e.g. ASSERT_EQ, EXPECT_STREQ, etc) failure.

//

// The first four parameters are the expressions used in the assertion

// and their values, as strings.  For example, for ASSERT_EQ(foo, bar)

// where foo is 5 and bar is 6, we have:

//

//   expected_expression: "foo"

//   actual_expression:   "bar"

//   expected_value:      "5"

//   actual_value:        "6"

//

// The ignoring_case parameter is true iff the assertion is a

// *_STRCASEEQ*.  When it's true, the string " (ignoring case)" will

// be inserted into the message.

GTEST_API_ AssertionResult EqFailure(const char* expected_expression,

                                     const char* actual_expression,

                                     const std::string& expected_value,

                                     const std::string& actual_value,

                                     bool ignoring_case);

// Constructs a failure message for Boolean assertions such as EXPECT_TRUE.

GTEST_API_ std::string GetBoolAssertionFailureMessage(

    const AssertionResult& assertion_result,

    const char* expression_text,

    const char* actual_predicate_value,

    const char* expected_predicate_value);

// This template class represents an IEEE floating-point number

// (either single-precision or double-precision, depending on the

// template parameters).

//

// The purpose of this class is to do more sophisticated number

// comparison.  (Due to round-off error, etc, it's very unlikely that

// two floating-points will be equal exactly.  Hence a naive

// comparison by the == operation often doesn't work.)

//

// Format of IEEE floating-point:

//

//   The most-significant bit being the leftmost, an IEEE

//   floating-point looks like

//

//     sign_bit exponent_bits fraction_bits

//

//   Here, sign_bit is a single bit that designates the sign of the

//   number.

//

//   For float, there are 8 exponent bits and 23 fraction bits.

//

//   For double, there are 11 exponent bits and 52 fraction bits.

//

//   More details can be found at

//   http://en.wikipedia.org/wiki/IEEE_floating-point_standard.

//

// Template parameter:

//

//   RawType: the raw floating-point type (either float or double)

template <typename RawType>

class FloatingPoint {

 public:

  // Defines the unsigned integer type that has the same size as the

  // floating point number.

  typedef typename TypeWithSize<sizeof(RawType)>::UInt Bits;

  // Constants.

  // # of bits in a number.

  static const size_t kBitCount = 8*sizeof(RawType);

  // # of fraction bits in a number.

  static const size_t kFractionBitCount =

    std::numeric_limits<RawType>::digits - 1;

  // # of exponent bits in a number.

  static const size_t kExponentBitCount = kBitCount - 1 - kFractionBitCount;

  // The mask for the sign bit.

  static const Bits kSignBitMask = static_cast<Bits>(1) << (kBitCount - 1);

  // The mask for the fraction bits.

  static const Bits kFractionBitMask =

    ~static_cast<Bits>(0) >> (kExponentBitCount + 1);

  // The mask for the exponent bits.

  static const Bits kExponentBitMask = ~(kSignBitMask | kFractionBitMask);

  // How many ULP's (Units in the Last Place) we want to tolerate when

  // comparing two numbers.  The larger the value, the more error we

  // allow.  A 0 value means that two numbers must be exactly the same

  // to be considered equal.

  //

  // The maximum error of a single floating-point operation is 0.5

  // units in the last place.  On Intel CPU's, all floating-point

  // calculations are done with 80-bit precision, while double has 64

  // bits.  Therefore, 4 should be enough for ordinary use.

  //

  // See the following article for more details on ULP:

  // http://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/

  static const size_t kMaxUlps = 4;

  // Constructs a FloatingPoint from a raw floating-point number.

  //

  // On an Intel CPU, passing a non-normalized NAN (Not a Number)

  // around may change its bits, although the new value is guaranteed

  // to be also a NAN.  Therefore, don't expect this constructor to

  // preserve the bits in x when x is a NAN.

  explicit FloatingPoint(const RawType& x) { u_.value_ = x; }

  // Static methods

  // Reinterprets a bit pattern as a floating-point number.

  //

  // This function is needed to test the AlmostEquals() method.

  static RawType ReinterpretBits(const Bits bits) {

    FloatingPoint fp(0);

    fp.u_.bits_ = bits;

    return fp.u_.value_;

  }

  // Returns the floating-point number that represent positive infinity.

  static RawType Infinity() {

    return ReinterpretBits(kExponentBitMask);

  }

  // Returns the maximum representable finite floating-point number.

  static RawType Max();

  // Non-static methods

  // Returns the bits that represents this number.

  const Bits &bits() const { return u_.bits_; }

  // Returns the exponent bits of this number.

  Bits exponent_bits() const { return kExponentBitMask & u_.bits_; }

  // Returns the fraction bits of this number.

  Bits fraction_bits() const { return kFractionBitMask & u_.bits_; }

  // Returns the sign bit of this number.

  Bits sign_bit() const { return kSignBitMask & u_.bits_; }

  // Returns true iff this is NAN (not a number).

  bool is_nan() const {

    // It's a NAN if the exponent bits are all ones and the fraction

    // bits are not entirely zeros.

    return (exponent_bits() == kExponentBitMask) && (fraction_bits() != 0);

  }

  // Returns true iff this number is at most kMaxUlps ULP's away from

  // rhs.  In particular, this function:

  //

  //   - returns false if either number is (or both are) NAN.

  //   - treats really large numbers as almost equal to infinity.

  //   - thinks +0.0 and -0.0 are 0 DLP's apart.

  bool AlmostEquals(const FloatingPoint& rhs) const {

    // The IEEE standard says that any comparison operation involving

    // a NAN must return false.

    if (is_nan() || rhs.is_nan()) return false;

    return DistanceBetweenSignAndMagnitudeNumbers(u_.bits_, rhs.u_.bits_)

        <= kMaxUlps;

  }

 private:

  // The data type used to store the actual floating-point number.

  union FloatingPointUnion {

    RawType value_;  // The raw floating-point number.

    Bits bits_;      // The bits that represent the number.

  };

  // Converts an integer from the sign-and-magnitude representation to

  // the biased representation.  More precisely, let N be 2 to the

  // power of (kBitCount - 1), an integer x is represented by the

  // unsigned number x + N.

  //

  // For instance,

  //

  //   -N + 1 (the most negative number representable using

  //          sign-and-magnitude) is represented by 1;

  //   0      is represented by N; and

  //   N - 1  (the biggest number representable using

  //          sign-and-magnitude) is represented by 2N - 1.

  //

  // Read http://en.wikipedia.org/wiki/Signed_number_representations

  // for more details on signed number representations.

  static Bits SignAndMagnitudeToBiased(const Bits &sam) {

    if (kSignBitMask & sam) {

      // sam represents a negative number.

      return ~sam + 1;

    } else {

      // sam represents a positive number.

      return kSignBitMask | sam;

    }

  }

  // Given two numbers in the sign-and-magnitude representation,

  // returns the distance between them as an unsigned number.

  static Bits DistanceBetweenSignAndMagnitudeNumbers(const Bits &sam1,

                                                     const Bits &sam2) {

    const Bits biased1 = SignAndMagnitudeToBiased(sam1);

    const Bits biased2 = SignAndMagnitudeToBiased(sam2);

    return (biased1 >= biased2) ? (biased1 - biased2) : (biased2 - biased1);

  }

  FloatingPointUnion u_;

};

// We cannot use std::numeric_limits<T>::max() as it clashes with the max()

// macro defined by <windows.h>.

template <>

inline float FloatingPoint<float>::Max() { return FLT_MAX; }

template <>

inline double FloatingPoint<double>::Max() { return DBL_MAX; }

// Typedefs the instances of the FloatingPoint template class that we

// care to use.

typedef FloatingPoint<float> Float;

typedef FloatingPoint<double> Double;

// In order to catch the mistake of putting tests that use different

// test fixture classes in the same test case, we need to assign

// unique IDs to fixture classes and compare them.  The TypeId type is

// used to hold such IDs.  The user should treat TypeId as an opaque

// type: the only operation allowed on TypeId values is to compare

// them for equality using the == operator.

typedef const void* TypeId;

template <typename T>

class TypeIdHelper {

 public:

  // dummy_ must not have a const type.  Otherwise an overly eager

  // compiler (e.g. MSVC 7.1 & 8.0) may try to merge

  // TypeIdHelper<T>::dummy_ for different Ts as an "optimization".

  static bool dummy_;

};

template <typename T>

bool TypeIdHelper<T>::dummy_ = false;

// GetTypeId<T>() returns the ID of type T.  Different values will be

// returned for different types.  Calling the function twice with the

// same type argument is guaranteed to return the same ID.

template <typename T>

TypeId GetTypeId() {

  // The compiler is required to allocate a different

  // TypeIdHelper<T>::dummy_ variable for each T used to instantiate

  // the template.  Therefore, the address of dummy_ is guaranteed to

  // be unique.

  return &(TypeIdHelper<T>::dummy_);

}

// Returns the type ID of ::testing::Test.  Always call this instead

// of GetTypeId< ::testing::Test>() to get the type ID of

// ::testing::Test, as the latter may give the wrong result due to a

// suspected linker bug when compiling Google Test as a Mac OS X

// framework.

GTEST_API_ TypeId GetTestTypeId();

// Defines the abstract factory interface that creates instances

// of a Test object.

class TestFactoryBase {

 public:

  virtual ~TestFactoryBase() {}

  // Creates a test instance to run. The instance is both created and destroyed

  // within TestInfoImpl::Run()

  virtual Test* CreateTest() = 0;

 protected:

  TestFactoryBase() {}

 private:

  GTEST_DISALLOW_COPY_AND_ASSIGN_(TestFactoryBase);

};

// This class provides implementation of TeastFactoryBase interface.

// It is used in TEST and TEST_F macros.

template <class TestClass>

class TestFactoryImpl : public TestFactoryBase {

 public:

  virtual Test* CreateTest() { return new TestClass; }

};

#if GTEST_OS_WINDOWS

// Predicate-formatters for implementing the HRESULT checking macros

// {ASSERT|EXPECT}_HRESULT_{SUCCEEDED|FAILED}

// We pass a long instead of HRESULT to avoid causing an

// include dependency for the HRESULT type.

GTEST_API_ AssertionResult IsHRESULTSuccess(const char* expr,

                                            long hr);  // NOLINT

GTEST_API_ AssertionResult IsHRESULTFailure(const char* expr,

                                            long hr);  // NOLINT

#endif  // GTEST_OS_WINDOWS

// Types of SetUpTestCase() and TearDownTestCase() functions.

typedef void (*SetUpTestCaseFunc)();

typedef void (*TearDownTestCaseFunc)();

struct CodeLocation {

  CodeLocation(const string& a_file, int a_line) : file(a_file), line(a_line) {}

  string file;

  int line;

};

// Creates a new TestInfo object and registers it with Google Test;

// returns the created object.

//

// Arguments:

//

//   test_case_name:   name of the test case

//   name:             name of the test

//   type_param        the name of the test's type parameter, or NULL if

//                     this is not a typed or a type-parameterized test.

//   value_param       text representation of the test's value parameter,

//                     or NULL if this is not a type-parameterized test.

//   code_location:    code location where the test is defined

//   fixture_class_id: ID of the test fixture class

//   set_up_tc:        pointer to the function that sets up the test case

//   tear_down_tc:     pointer to the function that tears down the test case

//   factory:          pointer to the factory that creates a test object.

//                     The newly created TestInfo instance will assume

//                     ownership of the factory object.

GTEST_API_ TestInfo* MakeAndRegisterTestInfo(

    const char* test_case_name,

    const char* name,

    const char* type_param,

    const char* value_param,

    CodeLocation code_location,

    TypeId fixture_class_id,

    SetUpTestCaseFunc set_up_tc,

    TearDownTestCaseFunc tear_down_tc,

    TestFactoryBase* factory);

// If *pstr starts with the given prefix, modifies *pstr to be right

// past the prefix and returns true; otherwise leaves *pstr unchanged

// and returns false.  None of pstr, *pstr, and prefix can be NULL.

GTEST_API_ bool SkipPrefix(const char* prefix, const char** pstr);

#if GTEST_HAS_TYPED_TEST || GTEST_HAS_TYPED_TEST_P

// State of the definition of a type-parameterized test case.

class GTEST_API_ TypedTestCasePState {

 public:

  TypedTestCasePState() : registered_(false) {}

  // Adds the given test name to defined_test_names_ and return true

  // if the test case hasn't been registered; otherwise aborts the

  // program.

  bool AddTestName(const char* file, int line, const char* case_name,

                   const char* test_name) {

    if (registered_) {

      fprintf(stderr, "%s Test %s must be defined before "

              "REGISTER_TYPED_TEST_CASE_P(%s, ...).\n",

              FormatFileLocation(file, line).c_str(), test_name, case_name);

      fflush(stderr);

      posix::Abort();

    }

    registered_tests_.insert(

        ::std::make_pair(test_name, CodeLocation(file, line)));

    return true;

  }

  bool TestExists(const std::string& test_name) const {

    return registered_tests_.count(test_name) > 0;

  }

  const CodeLocation& GetCodeLocation(const std::string& test_name) const {

    RegisteredTestsMap::const_iterator it = registered_tests_.find(test_name);

    GTEST_CHECK_(it != registered_tests_.end());

    return it->second;

  }

  // Verifies that registered_tests match the test names in

  // defined_test_names_; returns registered_tests if successful, or

  // aborts the program otherwise.

  const char* VerifyRegisteredTestNames(

      const char* file, int line, const char* registered_tests);

 private:

  typedef ::std::map<std::string, CodeLocation> RegisteredTestsMap;

  bool registered_;

  RegisteredTestsMap registered_tests_;

};

// Skips to the first non-space char after the first comma in 'str';

// returns NULL if no comma is found in 'str'.

inline const char* SkipComma(const char* str) {

  const char* comma = strchr(str, ',');

  if (comma == NULL) {

    return NULL;

  }

  while (IsSpace(*(++comma))) {}

  return comma;

}

// Returns the prefix of 'str' before the first comma in it; returns

// the entire string if it contains no comma.

inline std::string GetPrefixUntilComma(const char* str) {

  const char* comma = strchr(str, ',');

  return comma == NULL ? str : std::string(str, comma);

}

// Splits a given string on a given delimiter, populating a given

// vector with the fields.

void SplitString(const ::std::string& str, char delimiter,

                 ::std::vector< ::std::string>* dest);

// TypeParameterizedTest<Fixture, TestSel, Types>::Register()

// registers a list of type-parameterized tests with Google Test.  The

// return value is insignificant - we just need to return something

// such that we can call this function in a namespace scope.

//

// Implementation note: The GTEST_TEMPLATE_ macro declares a template

// template parameter.  It's defined in gtest-type-util.h.

template <GTEST_TEMPLATE_ Fixture, class TestSel, typename Types>

class TypeParameterizedTest {

 public:

  // 'index' is the index of the test in the type list 'Types'

  // specified in INSTANTIATE_TYPED_TEST_CASE_P(Prefix, TestCase,

  // Types).  Valid values for 'index' are [0, N - 1] where N is the

  // length of Types.

  static bool Register(const char* prefix,

                       CodeLocation code_location,

                       const char* case_name, const char* test_names,

                       int index) {

    typedef typename Types::Head Type;

    typedef Fixture<Type> FixtureClass;

    typedef typename GTEST_BIND_(TestSel, Type) TestClass;

    // First, registers the first type-parameterized test in the type

    // list.

    MakeAndRegisterTestInfo(

        (std::string(prefix) + (prefix[0] == '\0' ? "" : "/") + case_name + "/"

         + StreamableToString(index)).c_str(),

        StripTrailingSpaces(GetPrefixUntilComma(test_names)).c_str(),

        GetTypeName<Type>().c_str(),

        NULL,  // No value parameter.

        code_location,

        GetTypeId<FixtureClass>(),

        TestClass::SetUpTestCase,

        TestClass::TearDownTestCase,

        new TestFactoryImpl<TestClass>);

    // Next, recurses (at compile time) with the tail of the type list.

    return TypeParameterizedTest<Fixture, TestSel, typename Types::Tail>

        ::Register(prefix, code_location, case_name, test_names, index + 1);

  }

};

// The base case for the compile time recursion.

template <GTEST_TEMPLATE_ Fixture, class TestSel>

class TypeParameterizedTest<Fixture, TestSel, Types0> {

 public:

  static bool Register(const char* /*prefix*/, CodeLocation,

                       const char* /*case_name*/, const char* /*test_names*/,

                       int /*index*/) {

    return true;

  }

};

// TypeParameterizedTestCase<Fixture, Tests, Types>::Register()

// registers *all combinations* of 'Tests' and 'Types' with Google

// Test.  The return value is insignificant - we just need to return

// something such that we can call this function in a namespace scope.

template <GTEST_TEMPLATE_ Fixture, typename Tests, typename Types>

class TypeParameterizedTestCase {

 public:

  static bool Register(const char* prefix, CodeLocation code_location,

                       const TypedTestCasePState* state,

                       const char* case_name, const char* test_names) {

    std::string test_name = StripTrailingSpaces(

        GetPrefixUntilComma(test_names));

    if (!state->TestExists(test_name)) {

      fprintf(stderr, "Failed to get code location for test %s.%s at %s.",

              case_name, test_name.c_str(),

              FormatFileLocation(code_location.file.c_str(),

                                 code_location.line).c_str());

      fflush(stderr);

      posix::Abort();

    }

    const CodeLocation& test_location = state->GetCodeLocation(test_name);

    typedef typename Tests::Head Head;

    // First, register the first test in 'Test' for each type in 'Types'.

    TypeParameterizedTest<Fixture, Head, Types>::Register(

        prefix, test_location, case_name, test_names, 0);

    // Next, recurses (at compile time) with the tail of the test list.

    return TypeParameterizedTestCase<Fixture, typename Tests::Tail, Types>

        ::Register(prefix, code_location, state,

                   case_name, SkipComma(test_names));

  }

};

// The base case for the compile time recursion.

template <GTEST_TEMPLATE_ Fixture, typename Types>

class TypeParameterizedTestCase<Fixture, Templates0, Types> {

 public:

  static bool Register(const char* /*prefix*/, CodeLocation,

                       const TypedTestCasePState* /*state*/,