// Copyright 2007, Google Inc.
// All rights reserved.
//
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// 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.
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// 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,
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// 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.
//
// 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<T>::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<string> 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 <ostream>  // NOLINT
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#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<T, kTypeKind>::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 <typename T, TypeKind kTypeKind>
class TypeWithoutFormatter
{
public:
	// This default version is called when kTypeKind is kOtherType.
	static void PrintValue(const T& value, ::std::ostream* os)
	{
		PrintBytesInObjectTo(reinterpret_cast<const unsigned char*>(&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 <typename T>
class TypeWithoutFormatter<T, kProtobuf>
{
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 <typename T>
class TypeWithoutFormatter<T, kConvertibleToInteger>
{
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<T>::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<Char,
// 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<Char,
// CharTraits>, as the compiler cannot tell whether
// operator<<(std::ostream&, const T&) or
// operator<<(std::basic_stream<Char, CharTraits>, const Foo&) is more
// specific.
template <typename Char, typename CharTraits, typename T>
::std::basic_ostream<Char, CharTraits>& operator<<(
	::std::basic_ostream<Char, CharTraits>& os, const T& x)
{
	TypeWithoutFormatter<T,
						 (internal::IsAProtocolMessage<T>::value ? kProtobuf : internal::ImplicitlyConvertible<const T&, internal::BiggestInt>::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 <typename T>
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<T>::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 <typename T>
class UniversalPrinter;

template <typename T>
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 <typename C>
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 <typename T>
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<T*, const void*>::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<const void*>(
				reinterpret_cast<internal::UInt64>(p));
		}
	}
}

// Used to print a non-container, non-pointer value when the user
// doesn't define PrintTo() for it.
template <typename T>
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<T>::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 <typename T>
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<T>(0), is_pointer<T>(), value, os);
}

// The following list of PrintTo() overloads tells
// UniversalPrinter<T>::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<unsigned char>(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_<const char*>(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_<const void*>(s), os);
}
inline void PrintTo(signed char* s, ::std::ostream* os)
{
	PrintTo(ImplicitCast_<const void*>(s), os);
}
inline void PrintTo(const unsigned char* s, ::std::ostream* os)
{
	PrintTo(ImplicitCast_<const void*>(s), os);
}
inline void PrintTo(unsigned char* s, ::std::ostream* os)
{
	PrintTo(ImplicitCast_<const void*>(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_<const wchar_t*>(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 <typename T>
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 <typename T>
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 <typename T1>
void PrintTo(const ::std::tr1::tuple<T1>& t, ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2>
void PrintTo(const ::std::tr1::tuple<T1, T2>& t, ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2, typename T3>
void PrintTo(const ::std::tr1::tuple<T1, T2, T3>& t, ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2, typename T3, typename T4>
void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4>& t, ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2, typename T3, typename T4, typename T5>
void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5>& t,
			 ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2, typename T3, typename T4, typename T5,
		  typename T6>
void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6>& t,
			 ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2, typename T3, typename T4, typename T5,
		  typename T6, typename T7>
void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7>& t,
			 ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2, typename T3, typename T4, typename T5,
		  typename T6, typename T7, typename T8>
void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7, T8>& t,
			 ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2, typename T3, typename T4, typename T5,
		  typename T6, typename T7, typename T8, typename T9>
void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9>& t,
			 ::std::ostream* os)
{
	PrintTupleTo(t, os);
}

template <typename T1, typename T2, typename T3, typename T4, typename T5,
		  typename T6, typename T7, typename T8, typename T9, typename T10>
void PrintTo(
	const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>& t,
	::std::ostream* os)
{
	PrintTupleTo(t, os);
}
#endif  // GTEST_HAS_TR1_TUPLE

// Overload for std::pair.
template <typename T1, typename T2>
void PrintTo(const ::std::pair<T1, T2>& 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<T1>::Print(value.first, os);
	*os << ", ";
	UniversalPrinter<T2>::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 <typename T>
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 <typename T>
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);

// This overload prints a (const) wchar_t array compactly.
GTEST_API_ void UniversalPrintArray(
	const wchar_t* begin, size_t len, ::std::ostream* os);

// Implements printing an array type T[N].
template <typename T, size_t N>
class UniversalPrinter<T[N]>
{
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 <typename T>
class UniversalPrinter<T&>
{
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<const void*>(&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 <typename T>
class UniversalTersePrinter
{
public:
	static void Print(const T& value, ::std::ostream* os)
	{
		UniversalPrint(value, os);
	}
};
template <typename T>
class UniversalTersePrinter<T&>
{
public:
	static void Print(const T& value, ::std::ostream* os)
	{
		UniversalPrint(value, os);
	}
};
template <typename T, size_t N>
class UniversalTersePrinter<T[N]>
{
public:
	static void Print(const T (&value)[N], ::std::ostream* os)
	{
		UniversalPrinter<T[N]>::Print(value, os);
	}
};
template <>
class UniversalTersePrinter<const char*>
{
public:
	static void Print(const char* str, ::std::ostream* os)
	{
		if (str == NULL)
		{
			*os << "NULL";
		}
		else
		{
			UniversalPrint(string(str), os);
		}
	}
};
template <>
class UniversalTersePrinter<char*>
{
public:
	static void Print(char* str, ::std::ostream* os)
	{
		UniversalTersePrinter<const char*>::Print(str, os);
	}
};

#if GTEST_HAS_STD_WSTRING
template <>
class UniversalTersePrinter<const wchar_t*>
{
public:
	static void Print(const wchar_t* str, ::std::ostream* os)
	{
		if (str == NULL)
		{
			*os << "NULL";
		}
		else
		{
			UniversalPrint(::std::wstring(str), os);
		}
	}
};
#endif

template <>
class UniversalTersePrinter<wchar_t*>
{
public:
	static void Print(wchar_t* str, ::std::ostream* os)
	{
		UniversalTersePrinter<const wchar_t*>::Print(str, os);
	}
};

template <typename T>
void UniversalTersePrint(const T& value, ::std::ostream* os)
{
	UniversalTersePrinter<T>::Print(value, 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 <typename T>
void UniversalPrint(const T& value, ::std::ostream* os)
{
	// A workarond for the bug in VC++ 7.1 that prevents us from instantiating
	// UniversalPrinter with T directly.
	typedef T T1;
	UniversalPrinter<T1>::Print(value, os);
}

#if GTEST_HAS_TR1_TUPLE
typedef ::std::vector<string> 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<N>::PrintPrefixTo(t, os) prints the first N
// fields in tuple t, and can be defined in terms of
// TuplePrefixPrinter<N - 1>.

// The inductive case.
template <size_t N>
struct TuplePrefixPrinter
{
	// Prints the first N fields of a tuple.
	template <typename Tuple>
	static void PrintPrefixTo(const Tuple& t, ::std::ostream* os)
	{
		TuplePrefixPrinter<N - 1>::PrintPrefixTo(t, os);
		*os << ", ";
		UniversalPrinter<typename ::std::tr1::tuple_element<N - 1, Tuple>::type>::Print(::std::tr1::get<N - 1>(t), os);
	}

	// Tersely prints the first N fields of a tuple to a string vector,
	// one element for each field.
	template <typename Tuple>
	static void TersePrintPrefixToStrings(const Tuple& t, Strings* strings)
	{
		TuplePrefixPrinter<N - 1>::TersePrintPrefixToStrings(t, strings);
		::std::stringstream ss;
		UniversalTersePrint(::std::tr1::get<N - 1>(t), &ss);
		strings->push_back(ss.str());
	}
};

// Base cases.
template <>
struct TuplePrefixPrinter<0>
{
	template <typename Tuple>
	static void PrintPrefixTo(const Tuple&, ::std::ostream*)
	{
	}

	template <typename Tuple>
	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 <typename Tuple>
	static void PrintPrefixTo(const Tuple& t, ::std::ostream* os)
	{
		UniversalPrinter<typename ::std::tr1::tuple_element<0, Tuple>::type>::
			Print(::std::tr1::get<0>(t), os);
	}

	template <typename Tuple>
	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 <typename T>
void PrintTupleTo(const T& t, ::std::ostream* os)
{
	*os << "(";
	TuplePrefixPrinter< ::std::tr1::tuple_size<T>::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 <typename Tuple>
Strings UniversalTersePrintTupleFieldsToStrings(const Tuple& value)
{
	Strings result;
	TuplePrefixPrinter< ::std::tr1::tuple_size<Tuple>::value>::
		TersePrintPrefixToStrings(value, &result);
	return result;
}
#endif  // GTEST_HAS_TR1_TUPLE

}  // namespace internal

template <typename T>
::std::string PrintToString(const T& value)
{
	::std::stringstream ss;
	internal::UniversalTersePrinter<T>::Print(value, &ss);
	return ss.str();
}

}  // namespace testing

#endif  // GTEST_INCLUDE_GTEST_GTEST_PRINTERS_H_
