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//

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//

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//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// Author: wan@google.com (Zhanyong Wan)

// Google Test - The Google C++ Testing Framework

//

// This file implements a universal value printer that can print a

// value of any type T:

//

//   void ::testing::internal::UniversalPrinter::Print(value, ostream_ptr);

//

// A user can teach this function how to print a class type T by

// defining either operator<<() or PrintTo() in the namespace that

// defines T.  More specifically, the FIRST defined function in the

// following list will be used (assuming T is defined in namespace

// foo):

//

//   1. foo::PrintTo(const T&, ostream*)

//   2. operator<<(ostream&, const T&) defined in either foo or the

//      global namespace.

//

// If none of the above is defined, it will print the debug string of

// the value if it is a protocol buffer, or print the raw bytes in the

// value otherwise.

//

// To aid debugging: when T is a reference type, the address of the

// value is also printed; when T is a (const) char pointer, both the

// pointer value and the NUL-terminated string it points to are

// printed.

//

// We also provide some convenient wrappers:

//

//   // Prints a value to a string.  For a (const or not) char

//   // pointer, the NUL-terminated string (but not the pointer) is

//   // printed.

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

//

//   // Prints a value tersely: for a reference type, the referenced

//   // value (but not the address) is printed; for a (const or not) char

//   // pointer, the NUL-terminated string (but not the pointer) is

//   // printed.

//   void ::testing::internal::UniversalTersePrint(const T& value, ostream*);

//

//   // Prints value using the type inferred by the compiler.  The difference

//   // from UniversalTersePrint() is that this function prints both the

//   // pointer and the NUL-terminated string for a (const or not) char pointer.

//   void ::testing::internal::UniversalPrint(const T& value, ostream*);

//

//   // Prints the fields of a tuple tersely to a string vector, one

//   // element for each field. Tuple support must be enabled in

//   // gtest-port.h.

//   std::vector UniversalTersePrintTupleFieldsToStrings(

//       const Tuple& value);

//

// Known limitation:

//

// The print primitives print the elements of an STL-style container

// using the compiler-inferred type of *iter where iter is a

// const_iterator of the container.  When const_iterator is an input

// iterator but not a forward iterator, this inferred type may not

// match value_type, and the print output may be incorrect.  In

// practice, this is rarely a problem as for most containers

// const_iterator is a forward iterator.  We'll fix this if there's an

// actual need for it.  Note that this fix cannot rely on value_type

// being defined as many user-defined container types don't have

// value_type.

#ifndef GTEST_INCLUDE_GTEST_GTEST_PRINTERS_H_

#define GTEST_INCLUDE_GTEST_GTEST_PRINTERS_H_

#include   // NOLINT

#include 

#include 

#include 

#include 

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

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

namespace testing {

// Definitions in the 'internal' and 'internal2' name spaces are

// subject to change without notice.  DO NOT USE THEM IN USER CODE!

namespace internal2 {

// Prints the given number of bytes in the given object to the given

// ostream.

GTEST_API_ void PrintBytesInObjectTo(const unsigned char* obj_bytes,

                                     size_t count,

                                     ::std::ostream* os);

// For selecting which printer to use when a given type has neither <<

// nor PrintTo().

enum TypeKind {

  kProtobuf,              // a protobuf type

  kConvertibleToInteger,  // a type implicitly convertible to BiggestInt

                          // (e.g. a named or unnamed enum type)

  kOtherType              // anything else

};

// TypeWithoutFormatter::PrintValue(value, os) is called

// by the universal printer to print a value of type T when neither

// operator<< nor PrintTo() is defined for T, where kTypeKind is the

// "kind" of T as defined by enum TypeKind.

template 

class TypeWithoutFormatter {

 public:

  // This default version is called when kTypeKind is kOtherType.

  static void PrintValue(const T& value, ::std::ostream* os) {

    PrintBytesInObjectTo(reinterpret_cast(&value),

                         sizeof(value), os);

  }

};

// We print a protobuf using its ShortDebugString() when the string

// doesn't exceed this many characters; otherwise we print it using

// DebugString() for better readability.

const size_t kProtobufOneLinerMaxLength = 50;

template 

class TypeWithoutFormatter {

 public:

  static void PrintValue(const T& value, ::std::ostream* os) {

    const ::testing::internal::string short_str = value.ShortDebugString();

    const ::testing::internal::string pretty_str =

        short_str.length() <= kProtobufOneLinerMaxLength ?

        short_str : ("\n" + value.DebugString());

    *os << ("<" + pretty_str + ">");

  }

};

template 

class TypeWithoutFormatter {

 public:

  // Since T has no << operator or PrintTo() but can be implicitly

  // converted to BiggestInt, we print it as a BiggestInt.

  //

  // Most likely T is an enum type (either named or unnamed), in which

  // case printing it as an integer is the desired behavior.  In case

  // T is not an enum, printing it as an integer is the best we can do

  // given that it has no user-defined printer.

  static void PrintValue(const T& value, ::std::ostream* os) {

    const internal::BiggestInt kBigInt = value;

    *os << kBigInt;

  }

};

// Prints the given value to the given ostream.  If the value is a

// protocol message, its debug string is printed; if it's an enum or

// of a type implicitly convertible to BiggestInt, it's printed as an

// integer; otherwise the bytes in the value are printed.  This is

// what UniversalPrinter::Print() does when it knows nothing about

// type T and T has neither << operator nor PrintTo().

//

// A user can override this behavior for a class type Foo by defining

// a << operator in the namespace where Foo is defined.

//

// We put this operator in namespace 'internal2' instead of 'internal'

// to simplify the implementation, as much code in 'internal' needs to

// use << in STL, which would conflict with our own << were it defined

// in 'internal'.

//

// Note that this operator<< takes a generic std::basic_ostream

// CharTraits> type instead of the more restricted std::ostream.  If

// we define it to take an std::ostream instead, we'll get an

// "ambiguous overloads" compiler error when trying to print a type

// Foo that supports streaming to std::basic_ostream

// CharTraits>, as the compiler cannot tell whether

// operator<<(std::ostream&, const T&) or

// operator<<(std::basic_stream, const Foo&) is more

// specific.

template 

::std::basic_ostream& operator<<(

    ::std::basic_ostream& os, const T& x) {

  TypeWithoutFormatter

      (internal::IsAProtocolMessage::value ? kProtobuf :

       internal::ImplicitlyConvertible::value ?

       kConvertibleToInteger : kOtherType)>::PrintValue(x, &os);

  return os;

}

}  // namespace internal2

}  // namespace testing

// This namespace MUST NOT BE NESTED IN ::testing, or the name look-up

// magic needed for implementing UniversalPrinter won't work.

namespace testing_internal {

// Used to print a value that is not an STL-style container when the

// user doesn't define PrintTo() for it.

template 

void DefaultPrintNonContainerTo(const T& value, ::std::ostream* os) {

  // With the following statement, during unqualified name lookup,

  // testing::internal2::operator<< appears as if it was declared in

  // the nearest enclosing namespace that contains both

  // ::testing_internal and ::testing::internal2, i.e. the global

  // namespace.  For more details, refer to the C++ Standard section

  // 7.3.4-1 [namespace.udir].  This allows us to fall back onto

  // testing::internal2::operator<< in case T doesn't come with a <<

  // operator.

  //

  // We cannot write 'using ::testing::internal2::operator<<;', which

  // gcc 3.3 fails to compile due to a compiler bug.

  using namespace ::testing::internal2;  // NOLINT

  // Assuming T is defined in namespace foo, in the next statement,

  // the compiler will consider all of:

  //

  //   1. foo::operator<< (thanks to Koenig look-up),

  //   2. ::operator<< (as the current namespace is enclosed in ::),

  //   3. testing::internal2::operator<< (thanks to the using statement above).

  //

  // The operator<< whose type matches T best will be picked.

  //

  // We deliberately allow #2 to be a candidate, as sometimes it's

  // impossible to define #1 (e.g. when foo is ::std, defining

  // anything in it is undefined behavior unless you are a compiler

  // vendor.).

  *os << value;

}

}  // namespace testing_internal

namespace testing {

namespace internal {

// UniversalPrinter::Print(value, ostream_ptr) prints the given

// value to the given ostream.  The caller must ensure that

// 'ostream_ptr' is not NULL, or the behavior is undefined.

//

// We define UniversalPrinter as a class template (as opposed to a

// function template), as we need to partially specialize it for

// reference types, which cannot be done with function templates.

template 

class UniversalPrinter;

template 

void UniversalPrint(const T& value, ::std::ostream* os);

// Used to print an STL-style container when the user doesn't define

// a PrintTo() for it.

template 

void DefaultPrintTo(IsContainer /* dummy */,

                    false_type /* is not a pointer */,

                    const C& container, ::std::ostream* os) {

  const size_t kMaxCount = 32;  // The maximum number of elements to print.

  *os << '{';

  size_t count = 0;

  for (typename C::const_iterator it = container.begin();

       it != container.end(); ++it, ++count) {

    if (count > 0) {

      *os << ',';

      if (count == kMaxCount) {  // Enough has been printed.

        *os << " ...";

        break;

      }

    }

    *os << ' ';

    // We cannot call PrintTo(*it, os) here as PrintTo() doesn't

    // handle *it being a native array.

    internal::UniversalPrint(*it, os);

  }

  if (count > 0) {

    *os << ' ';

  }

  *os << '}';

}

// Used to print a pointer that is neither a char pointer nor a member

// pointer, when the user doesn't define PrintTo() for it.  (A member

// variable pointer or member function pointer doesn't really point to

// a location in the address space.  Their representation is

// implementation-defined.  Therefore they will be printed as raw

// bytes.)

template 

void DefaultPrintTo(IsNotContainer /* dummy */,

                    true_type /* is a pointer */,

                    T* p, ::std::ostream* os) {

  if (p == NULL) {

    *os << "NULL";

  } else {

    // C++ doesn't allow casting from a function pointer to any object

    // pointer.

    //

    // IsTrue() silences warnings: "Condition is always true",

    // "unreachable code".

    if (IsTrue(ImplicitlyConvertible::value)) {

      // T is not a function type.  We just call << to print p,

      // relying on ADL to pick up user-defined << for their pointer

      // types, if any.

      *os << p;

    } else {

      // T is a function type, so '*os << p' doesn't do what we want

      // (it just prints p as bool).  We want to print p as a const

      // void*.  However, we cannot cast it to const void* directly,

      // even using reinterpret_cast, as earlier versions of gcc

      // (e.g. 3.4.5) cannot compile the cast when p is a function

      // pointer.  Casting to UInt64 first solves the problem.

      *os << reinterpret_cast(

          reinterpret_cast(p));

    }

  }

}

// Used to print a non-container, non-pointer value when the user

// doesn't define PrintTo() for it.

template 

void DefaultPrintTo(IsNotContainer /* dummy */,

                    false_type /* is not a pointer */,

                    const T& value, ::std::ostream* os) {

  ::testing_internal::DefaultPrintNonContainerTo(value, os);

}

// Prints the given value using the << operator if it has one;

// otherwise prints the bytes in it.  This is what

// UniversalPrinter::Print() does when PrintTo() is not specialized

// or overloaded for type T.

//

// A user can override this behavior for a class type Foo by defining

// an overload of PrintTo() in the namespace where Foo is defined.  We

// give the user this option as sometimes defining a << operator for

// Foo is not desirable (e.g. the coding style may prevent doing it,

// or there is already a << operator but it doesn't do what the user

// wants).

template 

void PrintTo(const T& value, ::std::ostream* os) {

  // DefaultPrintTo() is overloaded.  The type of its first two

  // arguments determine which version will be picked.  If T is an

  // STL-style container, the version for container will be called; if

  // T is a pointer, the pointer version will be called; otherwise the

  // generic version will be called.

  //

  // Note that we check for container types here, prior to we check

  // for protocol message types in our operator<<.  The rationale is:

  //

  // For protocol messages, we want to give people a chance to

  // override Google Mock's format by defining a PrintTo() or

  // operator<<.  For STL containers, other formats can be

  // incompatible with Google Mock's format for the container

  // elements; therefore we check for container types here to ensure

  // that our format is used.

  //

  // The second argument of DefaultPrintTo() is needed to bypass a bug

  // in Symbian's C++ compiler that prevents it from picking the right

  // overload between:

  //

  //   PrintTo(const T& x, ...);

  //   PrintTo(T* x, ...);

  DefaultPrintTo(IsContainerTest(0), is_pointer(), value, os);

}

// The following list of PrintTo() overloads tells

// UniversalPrinter::Print() how to print standard types (built-in

// types, strings, plain arrays, and pointers).

// Overloads for various char types.

GTEST_API_ void PrintTo(unsigned char c, ::std::ostream* os);

GTEST_API_ void PrintTo(signed char c, ::std::ostream* os);

inline void PrintTo(char c, ::std::ostream* os) {

  // When printing a plain char, we always treat it as unsigned.  This

  // way, the output won't be affected by whether the compiler thinks

  // char is signed or not.

  PrintTo(static_cast(c), os);

}

// Overloads for other simple built-in types.

inline void PrintTo(bool x, ::std::ostream* os) {

  *os << (x ? "true" : "false");

}

// Overload for wchar_t type.

// Prints a wchar_t as a symbol if it is printable or as its internal

// code otherwise and also as its decimal code (except for L'\0').

// The L'\0' char is printed as "L'\\0'". The decimal code is printed

// as signed integer when wchar_t is implemented by the compiler

// as a signed type and is printed as an unsigned integer when wchar_t

// is implemented as an unsigned type.

GTEST_API_ void PrintTo(wchar_t wc, ::std::ostream* os);

// Overloads for C strings.

GTEST_API_ void PrintTo(const char* s, ::std::ostream* os);

inline void PrintTo(char* s, ::std::ostream* os) {

  PrintTo(ImplicitCast_(s), os);

}

// signed/unsigned char is often used for representing binary data, so

// we print pointers to it as void* to be safe.

inline void PrintTo(const signed char* s, ::std::ostream* os) {

  PrintTo(ImplicitCast_(s), os);

}

inline void PrintTo(signed char* s, ::std::ostream* os) {

  PrintTo(ImplicitCast_(s), os);

}

inline void PrintTo(const unsigned char* s, ::std::ostream* os) {

  PrintTo(ImplicitCast_(s), os);

}

inline void PrintTo(unsigned char* s, ::std::ostream* os) {

  PrintTo(ImplicitCast_(s), os);

}

// MSVC can be configured to define wchar_t as a typedef of unsigned

// short.  It defines _NATIVE_WCHAR_T_DEFINED when wchar_t is a native

// type.  When wchar_t is a typedef, defining an overload for const

// wchar_t* would cause unsigned short* be printed as a wide string,

// possibly causing invalid memory accesses.

#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED)

// Overloads for wide C strings

GTEST_API_ void PrintTo(const wchar_t* s, ::std::ostream* os);

inline void PrintTo(wchar_t* s, ::std::ostream* os) {

  PrintTo(ImplicitCast_(s), os);

}

#endif

// Overload for C arrays.  Multi-dimensional arrays are printed

// properly.

// Prints the given number of elements in an array, without printing

// the curly braces.

template 

void PrintRawArrayTo(const T a[], size_t count, ::std::ostream* os) {

  UniversalPrint(a[0], os);

  for (size_t i = 1; i != count; i++) {

    *os << ", ";

    UniversalPrint(a[i], os);

  }

}

// Overloads for ::string and ::std::string.

#if GTEST_HAS_GLOBAL_STRING

GTEST_API_ void PrintStringTo(const ::string&s, ::std::ostream* os);

inline void PrintTo(const ::string& s, ::std::ostream* os) {

  PrintStringTo(s, os);

}

#endif  // GTEST_HAS_GLOBAL_STRING

GTEST_API_ void PrintStringTo(const ::std::string&s, ::std::ostream* os);

inline void PrintTo(const ::std::string& s, ::std::ostream* os) {

  PrintStringTo(s, os);

}

// Overloads for ::wstring and ::std::wstring.

#if GTEST_HAS_GLOBAL_WSTRING

GTEST_API_ void PrintWideStringTo(const ::wstring&s, ::std::ostream* os);

inline void PrintTo(const ::wstring& s, ::std::ostream* os) {

  PrintWideStringTo(s, os);

}

#endif  // GTEST_HAS_GLOBAL_WSTRING

#if GTEST_HAS_STD_WSTRING

GTEST_API_ void PrintWideStringTo(const ::std::wstring&s, ::std::ostream* os);

inline void PrintTo(const ::std::wstring& s, ::std::ostream* os) {

  PrintWideStringTo(s, os);

}

#endif  // GTEST_HAS_STD_WSTRING

#if GTEST_HAS_TR1_TUPLE

// Overload for ::std::tr1::tuple.  Needed for printing function arguments,

// which are packed as tuples.

// Helper function for printing a tuple.  T must be instantiated with

// a tuple type.

template 

void PrintTupleTo(const T& t, ::std::ostream* os);

// Overloaded PrintTo() for tuples of various arities.  We support

// tuples of up-to 10 fields.  The following implementation works

// regardless of whether tr1::tuple is implemented using the

// non-standard variadic template feature or not.

inline void PrintTo(const ::std::tr1::tuple<>& t, ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

void PrintTo(const ::std::tr1::tuple& t, ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

void PrintTo(const ::std::tr1::tuple& t, ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

void PrintTo(const ::std::tr1::tuple& t, ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

void PrintTo(const ::std::tr1::tuple& t, ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

void PrintTo(const ::std::tr1::tuple& t,

             ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

          typename T6>

void PrintTo(const ::std::tr1::tuple& t,

             ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

          typename T6, typename T7>

void PrintTo(const ::std::tr1::tuple& t,

             ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

          typename T6, typename T7, typename T8>

void PrintTo(const ::std::tr1::tuple& t,

             ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

          typename T6, typename T7, typename T8, typename T9>

void PrintTo(const ::std::tr1::tuple& t,

             ::std::ostream* os) {

  PrintTupleTo(t, os);

}

template 

          typename T6, typename T7, typename T8, typename T9, typename T10>

void PrintTo(

    const ::std::tr1::tuple& t,

    ::std::ostream* os) {

  PrintTupleTo(t, os);

}

#endif  // GTEST_HAS_TR1_TUPLE

// Overload for std::pair.

template 

void PrintTo(const ::std::pair& value, ::std::ostream* os) {

  *os << '(';

  // We cannot use UniversalPrint(value.first, os) here, as T1 may be

  // a reference type.  The same for printing value.second.

  UniversalPrinter::Print(value.first, os);

  *os << ", ";

  UniversalPrinter::Print(value.second, os);

  *os << ')';

}

// Implements printing a non-reference type T by letting the compiler

// pick the right overload of PrintTo() for T.

template 

class UniversalPrinter {

 public:

  // MSVC warns about adding const to a function type, so we want to

  // disable the warning.

#ifdef _MSC_VER

# pragma warning(push)          // Saves the current warning state.

# pragma warning(disable:4180)  // Temporarily disables warning 4180.

#endif  // _MSC_VER

  // Note: we deliberately don't call this PrintTo(), as that name

  // conflicts with ::testing::internal::PrintTo in the body of the

  // function.

  static void Print(const T& value, ::std::ostream* os) {

    // By default, ::testing::internal::PrintTo() is used for printing

    // the value.

    //

    // Thanks to Koenig look-up, if T is a class and has its own

    // PrintTo() function defined in its namespace, that function will

    // be visible here.  Since it is more specific than the generic ones

    // in ::testing::internal, it will be picked by the compiler in the

    // following statement - exactly what we want.

    PrintTo(value, os);

  }

#ifdef _MSC_VER

# pragma warning(pop)           // Restores the warning state.

#endif  // _MSC_VER

};

// UniversalPrintArray(begin, len, os) prints an array of 'len'

// elements, starting at address 'begin'.

template 

void UniversalPrintArray(const T* begin, size_t len, ::std::ostream* os) {

  if (len == 0) {

    *os << "{}";

  } else {

    *os << "{ ";

    const size_t kThreshold = 18;

    const size_t kChunkSize = 8;

    // If the array has more than kThreshold elements, we'll have to

    // omit some details by printing only the first and the last

    // kChunkSize elements.

    // TODO(wan@google.com): let the user control the threshold using a flag.

    if (len <= kThreshold) {

      PrintRawArrayTo(begin, len, os);

    } else {

      PrintRawArrayTo(begin, kChunkSize, os);

      *os << ", ..., ";

      PrintRawArrayTo(begin + len - kChunkSize, kChunkSize, os);

    }

    *os << " }";

  }

}

// This overload prints a (const) char array compactly.

GTEST_API_ void UniversalPrintArray(const char* begin,

                                    size_t len,

                                    ::std::ostream* os);

// Implements printing an array type T[N].

template 

class UniversalPrinter {

 public:

  // Prints the given array, omitting some elements when there are too

  // many.

  static void Print(const T (&a)[N], ::std::ostream* os) {

    UniversalPrintArray(a, N, os);

  }

};

// Implements printing a reference type T&.

template 

class UniversalPrinter {

 public:

  // MSVC warns about adding const to a function type, so we want to

  // disable the warning.

#ifdef _MSC_VER

# pragma warning(push)          // Saves the current warning state.

# pragma warning(disable:4180)  // Temporarily disables warning 4180.

#endif  // _MSC_VER

  static void Print(const T& value, ::std::ostream* os) {

    // Prints the address of the value.  We use reinterpret_cast here

    // as static_cast doesn't compile when T is a function type.

    *os << "@" << reinterpret_cast(&value) << " ";

    // Then prints the value itself.

    UniversalPrint(value, os);

  }

#ifdef _MSC_VER

# pragma warning(pop)           // Restores the warning state.

#endif  // _MSC_VER

};

// Prints a value tersely: for a reference type, the referenced value

// (but not the address) is printed; for a (const) char pointer, the

// NUL-terminated string (but not the pointer) is printed.

template 

void UniversalTersePrint(const T& value, ::std::ostream* os) {

  UniversalPrint(value, os);

}

inline void UniversalTersePrint(const char* str, ::std::ostream* os) {

  if (str == NULL) {

    *os << "NULL";

  } else {

    UniversalPrint(string(str), os);

  }

}

inline void UniversalTersePrint(char* str, ::std::ostream* os) {

  UniversalTersePrint(static_cast(str), os);

}

// Prints a value using the type inferred by the compiler.  The

// difference between this and UniversalTersePrint() is that for a

// (const) char pointer, this prints both the pointer and the

// NUL-terminated string.

template 

void UniversalPrint(const T& value, ::std::ostream* os) {

  UniversalPrinter::Print(value, os);

}

#if GTEST_HAS_TR1_TUPLE

typedef ::std::vector Strings;

// This helper template allows PrintTo() for tuples and

// UniversalTersePrintTupleFieldsToStrings() to be defined by

// induction on the number of tuple fields.  The idea is that

// TuplePrefixPrinter::PrintPrefixTo(t, os) prints the first N

// fields in tuple t, and can be defined in terms of

// TuplePrefixPrinter.

// The inductive case.

template 

struct TuplePrefixPrinter {

  // Prints the first N fields of a tuple.

  template 

  static void PrintPrefixTo(const Tuple& t, ::std::ostream* os) {

    TuplePrefixPrinter::PrintPrefixTo(t, os);

    *os << ", ";

    UniversalPrinter::type>

        ::Print(::std::tr1::get(t), os);

  }

  // Tersely prints the first N fields of a tuple to a string vector,

  // one element for each field.

  template 

  static void TersePrintPrefixToStrings(const Tuple& t, Strings* strings) {

    TuplePrefixPrinter::TersePrintPrefixToStrings(t, strings);

    ::std::stringstream ss;

    UniversalTersePrint(::std::tr1::get(t), &ss);

    strings->push_back(ss.str());

  }

};

// Base cases.

template <>

struct TuplePrefixPrinter<0> {

  template 

  static void PrintPrefixTo(const Tuple&, ::std::ostream*) {}

  template 

  static void TersePrintPrefixToStrings(const Tuple&, Strings*) {}

};

// We have to specialize the entire TuplePrefixPrinter<> class

// template here, even though the definition of

// TersePrintPrefixToStrings() is the same as the generic version, as

// Embarcadero (formerly CodeGear, formerly Borland) C++ doesn't

// support specializing a method template of a class template.

template <>

struct TuplePrefixPrinter<1> {

  template 

  static void PrintPrefixTo(const Tuple& t, ::std::ostream* os) {

    UniversalPrinter::type>::

        Print(::std::tr1::get<0>(t), os);

  }

  template 

  static void TersePrintPrefixToStrings(const Tuple& t, Strings* strings) {

    ::std::stringstream ss;

    UniversalTersePrint(::std::tr1::get<0>(t), &ss);

    strings->push_back(ss.str());

  }

};

// Helper function for printing a tuple.  T must be instantiated with

// a tuple type.

template 

void PrintTupleTo(const T& t, ::std::ostream* os) {

  *os << "(";

  TuplePrefixPrinter< ::std::tr1::tuple_size::value>::

      PrintPrefixTo(t, os);

  *os << ")";

}

// Prints the fields of a tuple tersely to a string vector, one

// element for each field.  See the comment before

// UniversalTersePrint() for how we define "tersely".

template 

Strings UniversalTersePrintTupleFieldsToStrings(const Tuple& value) {

  Strings result;

  TuplePrefixPrinter< ::std::tr1::tuple_size::value>::

      TersePrintPrefixToStrings(value, &result);

  return result;

}

#endif  // GTEST_HAS_TR1_TUPLE

}  // namespace internal

template 

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

  ::std::stringstream ss;

  internal::UniversalTersePrint(value, &ss);

  return ss.str();

}

}  // namespace testing

#endif  // GTEST_INCLUDE_GTEST_GTEST_PRINTERS_H_