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 private:
  ::std::ostream* const stream_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(MatchResultListener);
};

inline MatchResultListener::~MatchResultListener() {
}

// An instance of a subclass of this knows how to describe itself as a
// matcher.
class MatcherDescriberInterface {
 public:
  virtual ~MatcherDescriberInterface() {}

  // Describes this matcher to an ostream.  The function should print
  // a verb phrase that describes the property a value matching this
  // matcher should have.  The subject of the verb phrase is the value
  // being matched.  For example, the DescribeTo() method of the Gt(7)
  // matcher prints "is greater than 7".
  virtual void DescribeTo(::std::ostream* os) const = 0;

  // Describes the negation of this matcher to an ostream.  For
  // example, if the description of this matcher is "is greater than
  // 7", the negated description could be "is not greater than 7".
  // You are not required to override this when implementing
  // MatcherInterface, but it is highly advised so that your matcher
  // can produce good error messages.
  virtual void DescribeNegationTo(::std::ostream* os) const {
    *os << "not (";
    DescribeTo(os);
    *os << ")";
  }
};

// The implementation of a matcher.
template <typename T>
class MatcherInterface : public MatcherDescriberInterface {
 public:
  // Returns true iff the matcher matches x; also explains the match
  // result to 'listener' if necessary (see the next paragraph), in
  // the form of a non-restrictive relative clause ("which ...",
  // "whose ...", etc) that describes x.  For example, the
  // MatchAndExplain() method of the Pointee(...) matcher should
  // generate an explanation like "which points to ...".
  //
  // Implementations of MatchAndExplain() should add an explanation of
  // the match result *if and only if* they can provide additional
  // information that's not already present (or not obvious) in the
  // print-out of x and the matcher's description.  Whether the match
  // succeeds is not a factor in deciding whether an explanation is
  // needed, as sometimes the caller needs to print a failure message
  // when the match succeeds (e.g. when the matcher is used inside
  // Not()).
  //
  // For example, a "has at least 10 elements" matcher should explain
  // what the actual element count is, regardless of the match result,
  // as it is useful information to the reader; on the other hand, an
  // "is empty" matcher probably only needs to explain what the actual
  // size is when the match fails, as it's redundant to say that the
  // size is 0 when the value is already known to be empty.
  //
  // You should override this method when defining a new matcher.
  //
  // It's the responsibility of the caller (Google Mock) to guarantee
  // that 'listener' is not NULL.  This helps to simplify a matcher's
  // implementation when it doesn't care about the performance, as it
  // can talk to 'listener' without checking its validity first.
  // However, in order to implement dummy listeners efficiently,
  // listener->stream() may be NULL.
  virtual bool MatchAndExplain(T x, MatchResultListener* listener) const = 0;

  // Inherits these methods from MatcherDescriberInterface:
  //   virtual void DescribeTo(::std::ostream* os) const = 0;
  //   virtual void DescribeNegationTo(::std::ostream* os) const;
};

// A match result listener that stores the explanation in a string.
class StringMatchResultListener : public MatchResultListener {
 public:
  StringMatchResultListener() : MatchResultListener(&ss_) {}

  // Returns the explanation accumulated so far.
  internal::string str() const { return ss_.str(); }

  // Clears the explanation accumulated so far.
  void Clear() { ss_.str(""); }

 private:
  ::std::stringstream ss_;

  GTEST_DISALLOW_COPY_AND_ASSIGN_(StringMatchResultListener);
};

namespace internal {

struct AnyEq {
  template <typename A, typename B>
  bool operator()(const A& a, const B& b) const { return a == b; }
};
struct AnyNe {
  template <typename A, typename B>
  bool operator()(const A& a, const B& b) const { return a != b; }
};
struct AnyLt {
  template <typename A, typename B>
  bool operator()(const A& a, const B& b) const { return a < b; }
};
struct AnyGt {
  template <typename A, typename B>
  bool operator()(const A& a, const B& b) const { return a > b; }
};
struct AnyLe {
  template <typename A, typename B>
  bool operator()(const A& a, const B& b) const { return a <= b; }
};
struct AnyGe {
  template <typename A, typename B>
  bool operator()(const A& a, const B& b) const { return a >= b; }
};