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

// Google Mock - a framework for writing C++ mock classes.

//

// This file defines some utilities useful for implementing Google

// Mock.  They are subject to change without notice, so please DO NOT

// USE THEM IN USER CODE.

#ifndef GMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_INTERNAL_UTILS_H_

#define GMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_INTERNAL_UTILS_H_

#include <stdio.h>

#include <ostream>  // NOLINT

#include <string>

#include "gmock/internal/gmock-generated-internal-utils.h"

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

#include "gtest/gtest.h"

namespace testing {

namespace internal {

// Converts an identifier name to a space-separated list of lower-case

// words.  Each maximum substring of the form [A-Za-z][a-z]*|\d+ is

// treated as one word.  For example, both "FooBar123" and

// "foo_bar_123" are converted to "foo bar 123".

GTEST_API_ string ConvertIdentifierNameToWords(const char* id_name);

// PointeeOf<Pointer>::type is the type of a value pointed to by a

// Pointer, which can be either a smart pointer or a raw pointer.  The

// following default implementation is for the case where Pointer is a

// smart pointer.

template <typename Pointer>

struct PointeeOf {

  // Smart pointer classes define type element_type as the type of

  // their pointees.

  typedef typename Pointer::element_type type;

};

// This specialization is for the raw pointer case.

template <typename T>

struct PointeeOf<T*> { typedef T type; };  // NOLINT

// GetRawPointer(p) returns the raw pointer underlying p when p is a

// smart pointer, or returns p itself when p is already a raw pointer.

// The following default implementation is for the smart pointer case.

template <typename Pointer>

inline const typename Pointer::element_type* GetRawPointer(const Pointer& p) {

  return p.get();

}

// This overloaded version is for the raw pointer case.

template <typename Element>

inline Element* GetRawPointer(Element* p) { return p; }

// This comparator allows linked_ptr to be stored in sets.

template <typename T>

struct LinkedPtrLessThan {

  bool operator()(const ::testing::internal::linked_ptr<T>& lhs,

                  const ::testing::internal::linked_ptr<T>& rhs) const {

    return lhs.get() < rhs.get();

  }

};

// Symbian compilation can be done with wchar_t being either a native

// type or a typedef.  Using Google Mock with OpenC without wchar_t

// should require the definition of _STLP_NO_WCHAR_T.

//

// MSVC treats wchar_t as a native type usually, but treats it as the

// same as unsigned short when the compiler option /Zc:wchar_t- is

// specified.  It defines _NATIVE_WCHAR_T_DEFINED symbol when wchar_t

// is a native type.

#if (GTEST_OS_SYMBIAN && defined(_STLP_NO_WCHAR_T)) || \

    (defined(_MSC_VER) && !defined(_NATIVE_WCHAR_T_DEFINED))

// wchar_t is a typedef.

#else

# define GMOCK_WCHAR_T_IS_NATIVE_ 1

#endif

// signed wchar_t and unsigned wchar_t are NOT in the C++ standard.

// Using them is a bad practice and not portable.  So DON'T use them.

//

// Still, Google Mock is designed to work even if the user uses signed

// wchar_t or unsigned wchar_t (obviously, assuming the compiler

// supports them).

//

// To gcc,

//   wchar_t == signed wchar_t != unsigned wchar_t == unsigned int

#ifdef __GNUC__

// signed/unsigned wchar_t are valid types.

# define GMOCK_HAS_SIGNED_WCHAR_T_ 1

#endif

// In what follows, we use the term "kind" to indicate whether a type

// is bool, an integer type (excluding bool), a floating-point type,

// or none of them.  This categorization is useful for determining

// when a matcher argument type can be safely converted to another

// type in the implementation of SafeMatcherCast.

enum TypeKind {

  kBool, kInteger, kFloatingPoint, kOther

};

// KindOf<T>::value is the kind of type T.

template <typename T> struct KindOf {

  enum { value = kOther };  // The default kind.

};

// This macro declares that the kind of 'type' is 'kind'.

#define GMOCK_DECLARE_KIND_(type, kind) \

  template <> struct KindOf<type> { enum { value = kind }; }

GMOCK_DECLARE_KIND_(bool, kBool);

// All standard integer types.

GMOCK_DECLARE_KIND_(char, kInteger);

GMOCK_DECLARE_KIND_(signed char, kInteger);

GMOCK_DECLARE_KIND_(unsigned char, kInteger);

GMOCK_DECLARE_KIND_(short, kInteger);  // NOLINT

GMOCK_DECLARE_KIND_(unsigned short, kInteger);  // NOLINT

GMOCK_DECLARE_KIND_(int, kInteger);

GMOCK_DECLARE_KIND_(unsigned int, kInteger);

GMOCK_DECLARE_KIND_(long, kInteger);  // NOLINT

GMOCK_DECLARE_KIND_(unsigned long, kInteger);  // NOLINT

#if GMOCK_WCHAR_T_IS_NATIVE_

GMOCK_DECLARE_KIND_(wchar_t, kInteger);

#endif

// Non-standard integer types.

GMOCK_DECLARE_KIND_(Int64, kInteger);

GMOCK_DECLARE_KIND_(UInt64, kInteger);

// All standard floating-point types.

GMOCK_DECLARE_KIND_(float, kFloatingPoint);

GMOCK_DECLARE_KIND_(double, kFloatingPoint);

GMOCK_DECLARE_KIND_(long double, kFloatingPoint);

#undef GMOCK_DECLARE_KIND_

// Evaluates to the kind of 'type'.

#define GMOCK_KIND_OF_(type) \

  static_cast< ::testing::internal::TypeKind>( \

      ::testing::internal::KindOf<type>::value)

// Evaluates to true iff integer type T is signed.

#define GMOCK_IS_SIGNED_(T) (static_cast<T>(-1) < 0)

// LosslessArithmeticConvertibleImpl<kFromKind, From, kToKind, To>::value

// is true iff arithmetic type From can be losslessly converted to

// arithmetic type To.

//

// It's the user's responsibility to ensure that both From and To are

// raw (i.e. has no CV modifier, is not a pointer, and is not a

// reference) built-in arithmetic types, kFromKind is the kind of

// From, and kToKind is the kind of To; the value is

// implementation-defined when the above pre-condition is violated.

template <TypeKind kFromKind, typename From, TypeKind kToKind, typename To>

struct LosslessArithmeticConvertibleImpl : public false_type {};

// Converting bool to bool is lossless.

template <>

struct LosslessArithmeticConvertibleImpl<kBool, bool, kBool, bool>

    : public true_type {};  // NOLINT

// Converting bool to any integer type is lossless.

template <typename To>

struct LosslessArithmeticConvertibleImpl<kBool, bool, kInteger, To>

    : public true_type {};  // NOLINT

// Converting bool to any floating-point type is lossless.

template <typename To>

struct LosslessArithmeticConvertibleImpl<kBool, bool, kFloatingPoint, To>

    : public true_type {};  // NOLINT

// Converting an integer to bool is lossy.

template <typename From>

struct LosslessArithmeticConvertibleImpl<kInteger, From, kBool, bool>

    : public false_type {};  // NOLINT

// Converting an integer to another non-bool integer is lossless iff

// the target type's range encloses the source type's range.

template <typename From, typename To>

struct LosslessArithmeticConvertibleImpl<kInteger, From, kInteger, To>

    : public bool_constant<

      // When converting from a smaller size to a larger size, we are

      // fine as long as we are not converting from signed to unsigned.

      ((sizeof(From) < sizeof(To)) &&

       (!GMOCK_IS_SIGNED_(From) || GMOCK_IS_SIGNED_(To))) ||

      // When converting between the same size, the signedness must match.

      ((sizeof(From) == sizeof(To)) &&

       (GMOCK_IS_SIGNED_(From) == GMOCK_IS_SIGNED_(To)))> {};  // NOLINT

#undef GMOCK_IS_SIGNED_

// Converting an integer to a floating-point type may be lossy, since

// the format of a floating-point number is implementation-defined.

template <typename From, typename To>

struct LosslessArithmeticConvertibleImpl<kInteger, From, kFloatingPoint, To>

    : public false_type {};  // NOLINT

// Converting a floating-point to bool is lossy.

template <typename From>

struct LosslessArithmeticConvertibleImpl<kFloatingPoint, From, kBool, bool>

    : public false_type {};  // NOLINT

// Converting a floating-point to an integer is lossy.

template <typename From, typename To>

struct LosslessArithmeticConvertibleImpl<kFloatingPoint, From, kInteger, To>

    : public false_type {};  // NOLINT

// Converting a floating-point to another floating-point is lossless

// iff the target type is at least as big as the source type.

template <typename From, typename To>

struct LosslessArithmeticConvertibleImpl<

  kFloatingPoint, From, kFloatingPoint, To>

    : public bool_constant<sizeof(From) <= sizeof(To)> {};  // NOLINT

// LosslessArithmeticConvertible<From, To>::value is true iff arithmetic

// type From can be losslessly converted to arithmetic type To.

//

// It's the user's responsibility to ensure that both From and To are

// raw (i.e. has no CV modifier, is not a pointer, and is not a

// reference) built-in arithmetic types; the value is

// implementation-defined when the above pre-condition is violated.

template <typename From, typename To>

struct LosslessArithmeticConvertible

    : public LosslessArithmeticConvertibleImpl<

  GMOCK_KIND_OF_(From), From, GMOCK_KIND_OF_(To), To> {};  // NOLINT

// This interface knows how to report a Google Mock failure (either

// non-fatal or fatal).

class FailureReporterInterface {

 public:

  // The type of a failure (either non-fatal or fatal).

  enum FailureType {

    kNonfatal, kFatal

  };

  virtual ~FailureReporterInterface() {}

  // Reports a failure that occurred at the given source file location.

  virtual void ReportFailure(FailureType type, const char* file, int line,

                             const string& message) = 0;

};

// Returns the failure reporter used by Google Mock.

GTEST_API_ FailureReporterInterface* GetFailureReporter();

// Asserts that condition is true; aborts the process with the given

// message if condition is false.  We cannot use LOG(FATAL) or CHECK()

// as Google Mock might be used to mock the log sink itself.  We

// inline this function to prevent it from showing up in the stack

// trace.

inline void Assert(bool condition, const char* file, int line,

                   const string& msg) {

  if (!condition) {

    GetFailureReporter()->ReportFailure(FailureReporterInterface::kFatal,

                                        file, line, msg);

  }

}

inline void Assert(bool condition, const char* file, int line) {

  Assert(condition, file, line, "Assertion failed.");

}

// Verifies that condition is true; generates a non-fatal failure if

// condition is false.

inline void Expect(bool condition, const char* file, int line,

                   const string& msg) {

  if (!condition) {

    GetFailureReporter()->ReportFailure(FailureReporterInterface::kNonfatal,

                                        file, line, msg);

  }

}

inline void Expect(bool condition, const char* file, int line) {

  Expect(condition, file, line, "Expectation failed.");

}

// Severity level of a log.

enum LogSeverity {

  kInfo = 0,

  kWarning = 1

};

// Valid values for the --gmock_verbose flag.

// All logs (informational and warnings) are printed.

const char kInfoVerbosity[] = "info";

// Only warnings are printed.

const char kWarningVerbosity[] = "warning";

// No logs are printed.

const char kErrorVerbosity[] = "error";

// Returns true iff a log with the given severity is visible according

// to the --gmock_verbose flag.

GTEST_API_ bool LogIsVisible(LogSeverity severity);

// Prints the given message to stdout iff 'severity' >= the level

// specified by the --gmock_verbose flag.  If stack_frames_to_skip >=

// 0, also prints the stack trace excluding the top

// stack_frames_to_skip frames.  In opt mode, any positive

// stack_frames_to_skip is treated as 0, since we don't know which

// function calls will be inlined by the compiler and need to be

// conservative.

GTEST_API_ void Log(LogSeverity severity,

                    const string& message,

                    int stack_frames_to_skip);

// TODO(wan@google.com): group all type utilities together.

// Type traits.

// is_reference<T>::value is non-zero iff T is a reference type.

template <typename T> struct is_reference : public false_type {};

template <typename T> struct is_reference<T&> : public true_type {};

// type_equals<T1, T2>::value is non-zero iff T1 and T2 are the same type.

template <typename T1, typename T2> struct type_equals : public false_type {};

template <typename T> struct type_equals<T, T> : public true_type {};

// remove_reference<T>::type removes the reference from type T, if any.

template <typename T> struct remove_reference { typedef T type; };  // NOLINT

template <typename T> struct remove_reference<T&> { typedef T type; }; // NOLINT

// DecayArray<T>::type turns an array type U[N] to const U* and preserves

// other types.  Useful for saving a copy of a function argument.

template <typename T> struct DecayArray { typedef T type; };  // NOLINT

template <typename T, size_t N> struct DecayArray<T[N]> {

  typedef const T* type;

};

// Sometimes people use arrays whose size is not available at the use site

// (e.g. extern const char kNamePrefix[]).  This specialization covers that

// case.

template <typename T> struct DecayArray<T[]> {

  typedef const T* type;

};

// Disable MSVC warnings for infinite recursion, since in this case the

// the recursion is unreachable.

#ifdef _MSC_VER

# pragma warning(push)

# pragma warning(disable:4717)

#endif

// Invalid<T>() is usable as an expression of type T, but will terminate

// the program with an assertion failure if actually run.  This is useful

// when a value of type T is needed for compilation, but the statement

// will not really be executed (or we don't care if the statement

// crashes).

template <typename T>

inline T Invalid() {

  Assert(false, "", -1, "Internal error: attempt to return invalid value");

  // This statement is unreachable, and would never terminate even if it

  // could be reached. It is provided only to placate compiler warnings

  // about missing return statements.

  return Invalid<T>();

}

#ifdef _MSC_VER

# pragma warning(pop)

#endif

// Given a raw type (i.e. having no top-level reference or const

// modifier) RawContainer that's either an STL-style container or a

// native array, class StlContainerView<RawContainer> has the

// following members:

//

//   - type is a type that provides an STL-style container view to

//     (i.e. implements the STL container concept for) RawContainer;

//   - const_reference is a type that provides a reference to a const

//     RawContainer;

//   - ConstReference(raw_container) returns a const reference to an STL-style

//     container view to raw_container, which is a RawContainer.

//   - Copy(raw_container) returns an STL-style container view of a

//     copy of raw_container, which is a RawContainer.

//

// This generic version is used when RawContainer itself is already an

// STL-style container.

template <class RawContainer>

class StlContainerView {

 public:

  typedef RawContainer type;

  typedef const type& const_reference;

  static const_reference ConstReference(const RawContainer& container) {

    // Ensures that RawContainer is not a const type.

    testing::StaticAssertTypeEq<RawContainer,

        GTEST_REMOVE_CONST_(RawContainer)>();

    return container;

  }

  static type Copy(const RawContainer& container) { return container; }

};

// This specialization is used when RawContainer is a native array type.

template <typename Element, size_t N>

class StlContainerView<Element[N]> {

 public:

  typedef GTEST_REMOVE_CONST_(Element) RawElement;

  typedef internal::NativeArray<RawElement> type;

  // NativeArray<T> can represent a native array either by value or by

  // reference (selected by a constructor argument), so 'const type'

  // can be used to reference a const native array.  We cannot

  // 'typedef const type& const_reference' here, as that would mean

  // ConstReference() has to return a reference to a local variable.

  typedef const type const_reference;

  static const_reference ConstReference(const Element (&array)[N]) {

    // Ensures that Element is not a const type.

    testing::StaticAssertTypeEq<Element, RawElement>();

#if GTEST_OS_SYMBIAN

    // The Nokia Symbian compiler confuses itself in template instantiation

    // for this call without the cast to Element*:

    // function call '[testing::internal::NativeArray<char *>].NativeArray(

    //     {lval} const char *[4], long, testing::internal::RelationToSource)'

    //     does not match

    // 'testing::internal::NativeArray<char *>::NativeArray(

    //     char *const *, unsigned int, testing::internal::RelationToSource)'

    // (instantiating: 'testing::internal::ContainsMatcherImpl

    //     <const char * (&)[4]>::Matches(const char * (&)[4]) const')

    // (instantiating: 'testing::internal::StlContainerView<char *[4]>::

    //     ConstReference(const char * (&)[4])')

    // (and though the N parameter type is mismatched in the above explicit

    // conversion of it doesn't help - only the conversion of the array).

    return type(const_cast<Element*>(&array[0]), N,

                RelationToSourceReference());

#else

    return type(array, N, RelationToSourceReference());

#endif  // GTEST_OS_SYMBIAN

  }

  static type Copy(const Element (&array)[N]) {

#if GTEST_OS_SYMBIAN

    return type(const_cast<Element*>(&array[0]), N, RelationToSourceCopy());

#else

    return type(array, N, RelationToSourceCopy());

#endif  // GTEST_OS_SYMBIAN

  }

};

// This specialization is used when RawContainer is a native array

// represented as a (pointer, size) tuple.

template <typename ElementPointer, typename Size>

class StlContainerView< ::testing::tuple<ElementPointer, Size> > {

 public:

  typedef GTEST_REMOVE_CONST_(

      typename internal::PointeeOf<ElementPointer>::type) RawElement;

  typedef internal::NativeArray<RawElement> type;

  typedef const type const_reference;

  static const_reference ConstReference(

      const ::testing::tuple<ElementPointer, Size>& array) {

    return type(get<0>(array), get<1>(array), RelationToSourceReference());

  }

  static type Copy(const ::testing::tuple<ElementPointer, Size>& array) {

    return type(get<0>(array), get<1>(array), RelationToSourceCopy());

  }

};

// The following specialization prevents the user from instantiating

// StlContainer with a reference type.

template <typename T> class StlContainerView<T&>;

// A type transform to remove constness from the first part of a pair.

// Pairs like that are used as the value_type of associative containers,

// and this transform produces a similar but assignable pair.

template <typename T>

struct RemoveConstFromKey {

  typedef T type;

};

// Partially specialized to remove constness from std::pair<const K, V>.

template <typename K, typename V>

struct RemoveConstFromKey<std::pair<const K, V> > {

  typedef std::pair<K, V> type;

};

// Mapping from booleans to types. Similar to boost::bool_<kValue> and

// std::integral_constant<bool, kValue>.

template <bool kValue>

struct BooleanConstant {};

}  // namespace internal

}  // namespace testing

#endif  // GMOCK_INCLUDE_GMOCK_INTERNAL_GMOCK_INTERNAL_UTILS_H_