yaml-cpp

gtest-matchers.h (27039B)

---

 // Copyright 2007, 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.
 
 // The Google C++ Testing and Mocking Framework (Google Test)
 //
 // This file implements just enough of the matcher interface to allow
 // EXPECT_DEATH and friends to accept a matcher argument.
 
 // IWYU pragma: private, include "testing/base/public/gunit.h"
 // IWYU pragma: friend third_party/googletest/googlemock/.*
 // IWYU pragma: friend third_party/googletest/googletest/.*
 
 #ifndef GTEST_INCLUDE_GTEST_GTEST_MATCHERS_H_
 #define GTEST_INCLUDE_GTEST_GTEST_MATCHERS_H_
 
 #include <memory>
 #include <ostream>
 #include <string>
 #include <type_traits>
 
 #include "gtest/gtest-printers.h"
 #include "gtest/internal/gtest-internal.h"
 #include "gtest/internal/gtest-port.h"
 
 // MSVC warning C5046 is new as of VS2017 version 15.8.
 #if defined(_MSC_VER) && _MSC_VER >= 1915
 #define GTEST_MAYBE_5046_ 5046
 #else
 #define GTEST_MAYBE_5046_
 #endif
 
 GTEST_DISABLE_MSC_WARNINGS_PUSH_(
     4251 GTEST_MAYBE_5046_ /* class A needs to have dll-interface to be used by
                               clients of class B */
     /* Symbol involving type with internal linkage not defined */)
 
 namespace testing {
 
 // To implement a matcher Foo for type T, define:
 //   1. a class FooMatcherImpl that implements the
 //      MatcherInterface<T> interface, and
 //   2. a factory function that creates a Matcher<T> object from a
 //      FooMatcherImpl*.
 //
 // The two-level delegation design makes it possible to allow a user
 // to write "v" instead of "Eq(v)" where a Matcher is expected, which
 // is impossible if we pass matchers by pointers.  It also eases
 // ownership management as Matcher objects can now be copied like
 // plain values.
 
 // MatchResultListener is an abstract class.  Its << operator can be
 // used by a matcher to explain why a value matches or doesn't match.
 //
 class MatchResultListener {
  public:
   // Creates a listener object with the given underlying ostream.  The
   // listener does not own the ostream, and does not dereference it
   // in the constructor or destructor.
   explicit MatchResultListener(::std::ostream* os) : stream_(os) {}
   virtual ~MatchResultListener() = 0;  // Makes this class abstract.
 
   // Streams x to the underlying ostream; does nothing if the ostream
   // is NULL.
   template <typename T>
   MatchResultListener& operator<<(const T& x) {
     if (stream_ != nullptr) *stream_ << x;
     return *this;
   }
 
   // Returns the underlying ostream.
   ::std::ostream* stream() { return stream_; }
 
   // Returns true if and only if the listener is interested in an explanation
   // of the match result.  A matcher's MatchAndExplain() method can use
   // this information to avoid generating the explanation when no one
   // intends to hear it.
   bool IsInterested() const { return stream_ != nullptr; }
 
  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 if and only if 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 Test) 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;
 };
 
 namespace internal {
 
 // Converts a MatcherInterface<T> to a MatcherInterface<const T&>.
 template <typename T>
 class MatcherInterfaceAdapter : public MatcherInterface<const T&> {
  public:
   explicit MatcherInterfaceAdapter(const MatcherInterface<T>* impl)
       : impl_(impl) {}
   ~MatcherInterfaceAdapter() override { delete impl_; }
 
   void DescribeTo(::std::ostream* os) const override { impl_->DescribeTo(os); }
 
   void DescribeNegationTo(::std::ostream* os) const override {
     impl_->DescribeNegationTo(os);
   }
 
   bool MatchAndExplain(const T& x,
                        MatchResultListener* listener) const override {
     return impl_->MatchAndExplain(x, listener);
   }
 
  private:
   const MatcherInterface<T>* const impl_;
 
   GTEST_DISALLOW_COPY_AND_ASSIGN_(MatcherInterfaceAdapter);
 };
 
 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; }
 };
 
 // A match result listener that ignores the explanation.
 class DummyMatchResultListener : public MatchResultListener {
  public:
   DummyMatchResultListener() : MatchResultListener(nullptr) {}
 
  private:
   GTEST_DISALLOW_COPY_AND_ASSIGN_(DummyMatchResultListener);
 };
 
 // A match result listener that forwards the explanation to a given
 // ostream.  The difference between this and MatchResultListener is
 // that the former is concrete.
 class StreamMatchResultListener : public MatchResultListener {
  public:
   explicit StreamMatchResultListener(::std::ostream* os)
       : MatchResultListener(os) {}
 
  private:
   GTEST_DISALLOW_COPY_AND_ASSIGN_(StreamMatchResultListener);
 };
 
 // An internal class for implementing Matcher<T>, which will derive
 // from it.  We put functionalities common to all Matcher<T>
 // specializations here to avoid code duplication.
 template <typename T>
 class MatcherBase {
  public:
   // Returns true if and only if the matcher matches x; also explains the
   // match result to 'listener'.
   bool MatchAndExplain(const T& x, MatchResultListener* listener) const {
     return impl_->MatchAndExplain(x, listener);
   }
 
   // Returns true if and only if this matcher matches x.
   bool Matches(const T& x) const {
     DummyMatchResultListener dummy;
     return MatchAndExplain(x, &dummy);
   }
 
   // Describes this matcher to an ostream.
   void DescribeTo(::std::ostream* os) const { impl_->DescribeTo(os); }
 
   // Describes the negation of this matcher to an ostream.
   void DescribeNegationTo(::std::ostream* os) const {
     impl_->DescribeNegationTo(os);
   }
 
   // Explains why x matches, or doesn't match, the matcher.
   void ExplainMatchResultTo(const T& x, ::std::ostream* os) const {
     StreamMatchResultListener listener(os);
     MatchAndExplain(x, &listener);
   }
 
   // Returns the describer for this matcher object; retains ownership
   // of the describer, which is only guaranteed to be alive when
   // this matcher object is alive.
   const MatcherDescriberInterface* GetDescriber() const {
     return impl_.get();
   }
 
  protected:
   MatcherBase() {}
 
   // Constructs a matcher from its implementation.
   explicit MatcherBase(const MatcherInterface<const T&>* impl) : impl_(impl) {}
 
   template <typename U>
   explicit MatcherBase(
       const MatcherInterface<U>* impl,
       typename std::enable_if<!std::is_same<U, const U&>::value>::type* =
           nullptr)
       : impl_(new internal::MatcherInterfaceAdapter<U>(impl)) {}
 
   MatcherBase(const MatcherBase&) = default;
   MatcherBase& operator=(const MatcherBase&) = default;
   MatcherBase(MatcherBase&&) = default;
   MatcherBase& operator=(MatcherBase&&) = default;
 
   virtual ~MatcherBase() {}
 
  private:
   std::shared_ptr<const MatcherInterface<const T&>> impl_;
 };
 
 }  // namespace internal
 
 // A Matcher<T> is a copyable and IMMUTABLE (except by assignment)
 // object that can check whether a value of type T matches.  The
 // implementation of Matcher<T> is just a std::shared_ptr to const
 // MatcherInterface<T>.  Don't inherit from Matcher!
 template <typename T>
 class Matcher : public internal::MatcherBase<T> {
  public:
   // Constructs a null matcher.  Needed for storing Matcher objects in STL
   // containers.  A default-constructed matcher is not yet initialized.  You
   // cannot use it until a valid value has been assigned to it.
   explicit Matcher() {}  // NOLINT
 
   // Constructs a matcher from its implementation.
   explicit Matcher(const MatcherInterface<const T&>* impl)
       : internal::MatcherBase<T>(impl) {}
 
   template <typename U>
   explicit Matcher(
       const MatcherInterface<U>* impl,
       typename std::enable_if<!std::is_same<U, const U&>::value>::type* =
           nullptr)
       : internal::MatcherBase<T>(impl) {}
 
   // Implicit constructor here allows people to write
   // EXPECT_CALL(foo, Bar(5)) instead of EXPECT_CALL(foo, Bar(Eq(5))) sometimes
   Matcher(T value);  // NOLINT
 };
 
 // The following two specializations allow the user to write str
 // instead of Eq(str) and "foo" instead of Eq("foo") when a std::string
 // matcher is expected.
 template <>
 class GTEST_API_ Matcher<const std::string&>
     : public internal::MatcherBase<const std::string&> {
  public:
   Matcher() {}
 
   explicit Matcher(const MatcherInterface<const std::string&>* impl)
       : internal::MatcherBase<const std::string&>(impl) {}
 
   // Allows the user to write str instead of Eq(str) sometimes, where
   // str is a std::string object.
   Matcher(const std::string& s);  // NOLINT
 
   // Allows the user to write "foo" instead of Eq("foo") sometimes.
   Matcher(const char* s);  // NOLINT
 };
 
 template <>
 class GTEST_API_ Matcher<std::string>
     : public internal::MatcherBase<std::string> {
  public:
   Matcher() {}
 
   explicit Matcher(const MatcherInterface<const std::string&>* impl)
       : internal::MatcherBase<std::string>(impl) {}
   explicit Matcher(const MatcherInterface<std::string>* impl)
       : internal::MatcherBase<std::string>(impl) {}
 
   // Allows the user to write str instead of Eq(str) sometimes, where
   // str is a string object.
   Matcher(const std::string& s);  // NOLINT
 
   // Allows the user to write "foo" instead of Eq("foo") sometimes.
   Matcher(const char* s);  // NOLINT
 };
 
 #if GTEST_HAS_ABSL
 // The following two specializations allow the user to write str
 // instead of Eq(str) and "foo" instead of Eq("foo") when a absl::string_view
 // matcher is expected.
 template <>
 class GTEST_API_ Matcher<const absl::string_view&>
     : public internal::MatcherBase<const absl::string_view&> {
  public:
   Matcher() {}
 
   explicit Matcher(const MatcherInterface<const absl::string_view&>* impl)
       : internal::MatcherBase<const absl::string_view&>(impl) {}
 
   // Allows the user to write str instead of Eq(str) sometimes, where
   // str is a std::string object.
   Matcher(const std::string& s);  // NOLINT
 
   // Allows the user to write "foo" instead of Eq("foo") sometimes.
   Matcher(const char* s);  // NOLINT
 
   // Allows the user to pass absl::string_views directly.
   Matcher(absl::string_view s);  // NOLINT
 };
 
 template <>
 class GTEST_API_ Matcher<absl::string_view>
     : public internal::MatcherBase<absl::string_view> {
  public:
   Matcher() {}
 
   explicit Matcher(const MatcherInterface<const absl::string_view&>* impl)
       : internal::MatcherBase<absl::string_view>(impl) {}
   explicit Matcher(const MatcherInterface<absl::string_view>* impl)
       : internal::MatcherBase<absl::string_view>(impl) {}
 
   // Allows the user to write str instead of Eq(str) sometimes, where
   // str is a std::string object.
   Matcher(const std::string& s);  // NOLINT
 
   // Allows the user to write "foo" instead of Eq("foo") sometimes.
   Matcher(const char* s);  // NOLINT
 
   // Allows the user to pass absl::string_views directly.
   Matcher(absl::string_view s);  // NOLINT
 };
 #endif  // GTEST_HAS_ABSL
 
 // Prints a matcher in a human-readable format.
 template <typename T>
 std::ostream& operator<<(std::ostream& os, const Matcher<T>& matcher) {
   matcher.DescribeTo(&os);
   return os;
 }
 
 // The PolymorphicMatcher class template makes it easy to implement a
 // polymorphic matcher (i.e. a matcher that can match values of more
 // than one type, e.g. Eq(n) and NotNull()).
 //
 // To define a polymorphic matcher, a user should provide an Impl
 // class that has a DescribeTo() method and a DescribeNegationTo()
 // method, and define a member function (or member function template)
 //
 //   bool MatchAndExplain(const Value& value,
 //                        MatchResultListener* listener) const;
 //
 // See the definition of NotNull() for a complete example.
 template <class Impl>
 class PolymorphicMatcher {
  public:
   explicit PolymorphicMatcher(const Impl& an_impl) : impl_(an_impl) {}
 
   // Returns a mutable reference to the underlying matcher
   // implementation object.
   Impl& mutable_impl() { return impl_; }
 
   // Returns an immutable reference to the underlying matcher
   // implementation object.
   const Impl& impl() const { return impl_; }
 
   template <typename T>
   operator Matcher<T>() const {
     return Matcher<T>(new MonomorphicImpl<const T&>(impl_));
   }
 
  private:
   template <typename T>
   class MonomorphicImpl : public MatcherInterface<T> {
    public:
     explicit MonomorphicImpl(const Impl& impl) : impl_(impl) {}
 
     virtual void DescribeTo(::std::ostream* os) const { impl_.DescribeTo(os); }
 
     virtual void DescribeNegationTo(::std::ostream* os) const {
       impl_.DescribeNegationTo(os);
     }
 
     virtual bool MatchAndExplain(T x, MatchResultListener* listener) const {
       return impl_.MatchAndExplain(x, listener);
     }
 
    private:
     const Impl impl_;
   };
 
   Impl impl_;
 };
 
 // Creates a matcher from its implementation.
 // DEPRECATED: Especially in the generic code, prefer:
 //   Matcher<T>(new MyMatcherImpl<const T&>(...));
 //
 // MakeMatcher may create a Matcher that accepts its argument by value, which
 // leads to unnecessary copies & lack of support for non-copyable types.
 template <typename T>
 inline Matcher<T> MakeMatcher(const MatcherInterface<T>* impl) {
   return Matcher<T>(impl);
 }
 
 // Creates a polymorphic matcher from its implementation.  This is
 // easier to use than the PolymorphicMatcher<Impl> constructor as it
 // doesn't require you to explicitly write the template argument, e.g.
 //
 //   MakePolymorphicMatcher(foo);
 // vs
 //   PolymorphicMatcher<TypeOfFoo>(foo);
 template <class Impl>
 inline PolymorphicMatcher<Impl> MakePolymorphicMatcher(const Impl& impl) {
   return PolymorphicMatcher<Impl>(impl);
 }
 
 namespace internal {
 // Implements a matcher that compares a given value with a
 // pre-supplied value using one of the ==, <=, <, etc, operators.  The
 // two values being compared don't have to have the same type.
 //
 // The matcher defined here is polymorphic (for example, Eq(5) can be
 // used to match an int, a short, a double, etc).  Therefore we use
 // a template type conversion operator in the implementation.
 //
 // The following template definition assumes that the Rhs parameter is
 // a "bare" type (i.e. neither 'const T' nor 'T&').
 template <typename D, typename Rhs, typename Op>
 class ComparisonBase {
  public:
   explicit ComparisonBase(const Rhs& rhs) : rhs_(rhs) {}
   template <typename Lhs>
   operator Matcher<Lhs>() const {
     return Matcher<Lhs>(new Impl<const Lhs&>(rhs_));
   }
 
  private:
   template <typename T>
   static const T& Unwrap(const T& v) { return v; }
   template <typename T>
   static const T& Unwrap(std::reference_wrapper<T> v) { return v; }
 
   template <typename Lhs, typename = Rhs>
   class Impl : public MatcherInterface<Lhs> {
    public:
     explicit Impl(const Rhs& rhs) : rhs_(rhs) {}
     bool MatchAndExplain(Lhs lhs,
                          MatchResultListener* /* listener */) const override {
       return Op()(lhs, Unwrap(rhs_));
     }
     void DescribeTo(::std::ostream* os) const override {
       *os << D::Desc() << " ";
       UniversalPrint(Unwrap(rhs_), os);
     }
     void DescribeNegationTo(::std::ostream* os) const override {
       *os << D::NegatedDesc() <<  " ";
       UniversalPrint(Unwrap(rhs_), os);
     }
 
    private:
     Rhs rhs_;
   };
   Rhs rhs_;
 };
 
 template <typename Rhs>
 class EqMatcher : public ComparisonBase<EqMatcher<Rhs>, Rhs, AnyEq> {
  public:
   explicit EqMatcher(const Rhs& rhs)
       : ComparisonBase<EqMatcher<Rhs>, Rhs, AnyEq>(rhs) { }
   static const char* Desc() { return "is equal to"; }
   static const char* NegatedDesc() { return "isn't equal to"; }
 };
 template <typename Rhs>
 class NeMatcher : public ComparisonBase<NeMatcher<Rhs>, Rhs, AnyNe> {
  public:
   explicit NeMatcher(const Rhs& rhs)
       : ComparisonBase<NeMatcher<Rhs>, Rhs, AnyNe>(rhs) { }
   static const char* Desc() { return "isn't equal to"; }
   static const char* NegatedDesc() { return "is equal to"; }
 };
 template <typename Rhs>
 class LtMatcher : public ComparisonBase<LtMatcher<Rhs>, Rhs, AnyLt> {
  public:
   explicit LtMatcher(const Rhs& rhs)
       : ComparisonBase<LtMatcher<Rhs>, Rhs, AnyLt>(rhs) { }
   static const char* Desc() { return "is <"; }
   static const char* NegatedDesc() { return "isn't <"; }
 };
 template <typename Rhs>
 class GtMatcher : public ComparisonBase<GtMatcher<Rhs>, Rhs, AnyGt> {
  public:
   explicit GtMatcher(const Rhs& rhs)
       : ComparisonBase<GtMatcher<Rhs>, Rhs, AnyGt>(rhs) { }
   static const char* Desc() { return "is >"; }
   static const char* NegatedDesc() { return "isn't >"; }
 };
 template <typename Rhs>
 class LeMatcher : public ComparisonBase<LeMatcher<Rhs>, Rhs, AnyLe> {
  public:
   explicit LeMatcher(const Rhs& rhs)
       : ComparisonBase<LeMatcher<Rhs>, Rhs, AnyLe>(rhs) { }
   static const char* Desc() { return "is <="; }
   static const char* NegatedDesc() { return "isn't <="; }
 };
 template <typename Rhs>
 class GeMatcher : public ComparisonBase<GeMatcher<Rhs>, Rhs, AnyGe> {
  public:
   explicit GeMatcher(const Rhs& rhs)
       : ComparisonBase<GeMatcher<Rhs>, Rhs, AnyGe>(rhs) { }
   static const char* Desc() { return "is >="; }
   static const char* NegatedDesc() { return "isn't >="; }
 };
 
 // Implements polymorphic matchers MatchesRegex(regex) and
 // ContainsRegex(regex), which can be used as a Matcher<T> as long as
 // T can be converted to a string.
 class MatchesRegexMatcher {
  public:
   MatchesRegexMatcher(const RE* regex, bool full_match)
       : regex_(regex), full_match_(full_match) {}
 
 #if GTEST_HAS_ABSL
   bool MatchAndExplain(const absl::string_view& s,
                        MatchResultListener* listener) const {
     return MatchAndExplain(std::string(s), listener);
   }
 #endif  // GTEST_HAS_ABSL
 
   // Accepts pointer types, particularly:
   //   const char*
   //   char*
   //   const wchar_t*
   //   wchar_t*
   template <typename CharType>
   bool MatchAndExplain(CharType* s, MatchResultListener* listener) const {
     return s != nullptr && MatchAndExplain(std::string(s), listener);
   }
 
   // Matches anything that can convert to std::string.
   //
   // This is a template, not just a plain function with const std::string&,
   // because absl::string_view has some interfering non-explicit constructors.
   template <class MatcheeStringType>
   bool MatchAndExplain(const MatcheeStringType& s,
                        MatchResultListener* /* listener */) const {
     const std::string& s2(s);
     return full_match_ ? RE::FullMatch(s2, *regex_)
                        : RE::PartialMatch(s2, *regex_);
   }
 
   void DescribeTo(::std::ostream* os) const {
     *os << (full_match_ ? "matches" : "contains") << " regular expression ";
     UniversalPrinter<std::string>::Print(regex_->pattern(), os);
   }
 
   void DescribeNegationTo(::std::ostream* os) const {
     *os << "doesn't " << (full_match_ ? "match" : "contain")
         << " regular expression ";
     UniversalPrinter<std::string>::Print(regex_->pattern(), os);
   }
 
  private:
   const std::shared_ptr<const RE> regex_;
   const bool full_match_;
 };
 }  // namespace internal
 
 // Matches a string that fully matches regular expression 'regex'.
 // The matcher takes ownership of 'regex'.
 inline PolymorphicMatcher<internal::MatchesRegexMatcher> MatchesRegex(
     const internal::RE* regex) {
   return MakePolymorphicMatcher(internal::MatchesRegexMatcher(regex, true));
 }
 inline PolymorphicMatcher<internal::MatchesRegexMatcher> MatchesRegex(
     const std::string& regex) {
   return MatchesRegex(new internal::RE(regex));
 }
 
 // Matches a string that contains regular expression 'regex'.
 // The matcher takes ownership of 'regex'.
 inline PolymorphicMatcher<internal::MatchesRegexMatcher> ContainsRegex(
     const internal::RE* regex) {
   return MakePolymorphicMatcher(internal::MatchesRegexMatcher(regex, false));
 }
 inline PolymorphicMatcher<internal::MatchesRegexMatcher> ContainsRegex(
     const std::string& regex) {
   return ContainsRegex(new internal::RE(regex));
 }
 
 // Creates a polymorphic matcher that matches anything equal to x.
 // Note: if the parameter of Eq() were declared as const T&, Eq("foo")
 // wouldn't compile.
 template <typename T>
 inline internal::EqMatcher<T> Eq(T x) { return internal::EqMatcher<T>(x); }
 
 // Constructs a Matcher<T> from a 'value' of type T.  The constructed
 // matcher matches any value that's equal to 'value'.
 template <typename T>
 Matcher<T>::Matcher(T value) { *this = Eq(value); }
 
 // Creates a monomorphic matcher that matches anything with type Lhs
 // and equal to rhs.  A user may need to use this instead of Eq(...)
 // in order to resolve an overloading ambiguity.
 //
 // TypedEq<T>(x) is just a convenient short-hand for Matcher<T>(Eq(x))
 // or Matcher<T>(x), but more readable than the latter.
 //
 // We could define similar monomorphic matchers for other comparison
 // operations (e.g. TypedLt, TypedGe, and etc), but decided not to do
 // it yet as those are used much less than Eq() in practice.  A user
 // can always write Matcher<T>(Lt(5)) to be explicit about the type,
 // for example.
 template <typename Lhs, typename Rhs>
 inline Matcher<Lhs> TypedEq(const Rhs& rhs) { return Eq(rhs); }
 
 // Creates a polymorphic matcher that matches anything >= x.
 template <typename Rhs>
 inline internal::GeMatcher<Rhs> Ge(Rhs x) {
   return internal::GeMatcher<Rhs>(x);
 }
 
 // Creates a polymorphic matcher that matches anything > x.
 template <typename Rhs>
 inline internal::GtMatcher<Rhs> Gt(Rhs x) {
   return internal::GtMatcher<Rhs>(x);
 }
 
 // Creates a polymorphic matcher that matches anything <= x.
 template <typename Rhs>
 inline internal::LeMatcher<Rhs> Le(Rhs x) {
   return internal::LeMatcher<Rhs>(x);
 }
 
 // Creates a polymorphic matcher that matches anything < x.
 template <typename Rhs>
 inline internal::LtMatcher<Rhs> Lt(Rhs x) {
   return internal::LtMatcher<Rhs>(x);
 }
 
 // Creates a polymorphic matcher that matches anything != x.
 template <typename Rhs>
 inline internal::NeMatcher<Rhs> Ne(Rhs x) {
   return internal::NeMatcher<Rhs>(x);
 }
 }  // namespace testing
 
 GTEST_DISABLE_MSC_WARNINGS_POP_()  //  4251 5046
 
 #endif  // GTEST_INCLUDE_GTEST_GTEST_MATCHERS_H_