osb/source/test/gtest/gtest-matchers.h

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// 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 "gtest/gtest.h"
// IWYU pragma: friend gtest/.*
// IWYU pragma: friend gmock/.*
#ifndef GOOGLETEST_INCLUDE_GTEST_GTEST_MATCHERS_H_
#define GOOGLETEST_INCLUDE_GTEST_GTEST_MATCHERS_H_
#include <atomic>
#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 FooMatcherMatcher that implements the matcher interface:
// using is_gtest_matcher = void;
// bool MatchAndExplain(const T&, std::ostream*);
// (MatchResultListener* can also be used instead of std::ostream*)
// void DescribeTo(std::ostream*);
// void DescribeNegationTo(std::ostream*);
//
// 2. a factory function that creates a Matcher<T> object from a
// FooMatcherMatcher.
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_;
MatchResultListener(const MatchResultListener&) = delete;
MatchResultListener& operator=(const MatchResultListener&) = delete;
};
inline MatchResultListener::~MatchResultListener() {}
// An instance of a subclass of this knows how to describe itself as a
// matcher.
class GTEST_API_ 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 {
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:
DummyMatchResultListener(const DummyMatchResultListener&) = delete;
DummyMatchResultListener& operator=(const DummyMatchResultListener&) = delete;
};
// 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:
StreamMatchResultListener(const StreamMatchResultListener&) = delete;
StreamMatchResultListener& operator=(const StreamMatchResultListener&) =
delete;
};
struct SharedPayloadBase {
std::atomic<int> ref{1};
void Ref() { ref.fetch_add(1, std::memory_order_relaxed); }
bool Unref() { return ref.fetch_sub(1, std::memory_order_acq_rel) == 1; }
};
template <typename T>
struct SharedPayload : SharedPayloadBase {
explicit SharedPayload(const T& v) : value(v) {}
explicit SharedPayload(T&& v) : value(std::move(v)) {}
static void Destroy(SharedPayloadBase* shared) {
delete static_cast<SharedPayload*>(shared);
}
T value;
};
// 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 : private MatcherDescriberInterface {
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 {
GTEST_CHECK_(vtable_ != nullptr);
return vtable_->match_and_explain(*this, 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 final {
GTEST_CHECK_(vtable_ != nullptr);
vtable_->describe(*this, os, false);
}
// Describes the negation of this matcher to an ostream.
void DescribeNegationTo(::std::ostream* os) const final {
GTEST_CHECK_(vtable_ != nullptr);
vtable_->describe(*this, os, true);
}
// 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 {
if (vtable_ == nullptr) return nullptr;
return vtable_->get_describer(*this);
}
protected:
MatcherBase() : vtable_(nullptr), buffer_() {}
// Constructs a matcher from its implementation.
template <typename U>
explicit MatcherBase(const MatcherInterface<U>* impl)
: vtable_(nullptr), buffer_() {
Init(impl);
}
template <typename M, typename = typename std::remove_reference<
M>::type::is_gtest_matcher>
MatcherBase(M&& m) : vtable_(nullptr), buffer_() { // NOLINT
Init(std::forward<M>(m));
}
MatcherBase(const MatcherBase& other)
: vtable_(other.vtable_), buffer_(other.buffer_) {
if (IsShared()) buffer_.shared->Ref();
}
MatcherBase& operator=(const MatcherBase& other) {
if (this == &other) return *this;
Destroy();
vtable_ = other.vtable_;
buffer_ = other.buffer_;
if (IsShared()) buffer_.shared->Ref();
return *this;
}
MatcherBase(MatcherBase&& other)
: vtable_(other.vtable_), buffer_(other.buffer_) {
other.vtable_ = nullptr;
}
MatcherBase& operator=(MatcherBase&& other) {
if (this == &other) return *this;
Destroy();
vtable_ = other.vtable_;
buffer_ = other.buffer_;
other.vtable_ = nullptr;
return *this;
}
~MatcherBase() override { Destroy(); }
private:
struct VTable {
bool (*match_and_explain)(const MatcherBase&, const T&,
MatchResultListener*);
void (*describe)(const MatcherBase&, std::ostream*, bool negation);
// Returns the captured object if it implements the interface, otherwise
// returns the MatcherBase itself.
const MatcherDescriberInterface* (*get_describer)(const MatcherBase&);
// Called on shared instances when the reference count reaches 0.
void (*shared_destroy)(SharedPayloadBase*);
};
bool IsShared() const {
return vtable_ != nullptr && vtable_->shared_destroy != nullptr;
}
// If the implementation uses a listener, call that.
template <typename P>
static auto MatchAndExplainImpl(const MatcherBase& m, const T& value,
MatchResultListener* listener)
-> decltype(P::Get(m).MatchAndExplain(value, listener->stream())) {
return P::Get(m).MatchAndExplain(value, listener->stream());
}
template <typename P>
static auto MatchAndExplainImpl(const MatcherBase& m, const T& value,
MatchResultListener* listener)
-> decltype(P::Get(m).MatchAndExplain(value, listener)) {
return P::Get(m).MatchAndExplain(value, listener);
}
template <typename P>
static void DescribeImpl(const MatcherBase& m, std::ostream* os,
bool negation) {
if (negation) {
P::Get(m).DescribeNegationTo(os);
} else {
P::Get(m).DescribeTo(os);
}
}
template <typename P>
static const MatcherDescriberInterface* GetDescriberImpl(
const MatcherBase& m) {
// If the impl is a MatcherDescriberInterface, then return it.
// Otherwise use MatcherBase itself.
// This allows us to implement the GetDescriber() function without support
// from the impl, but some users really want to get their impl back when
// they call GetDescriber().
// We use std::get on a tuple as a workaround of not having `if constexpr`.
return std::get<(
std::is_convertible<decltype(&P::Get(m)),
const MatcherDescriberInterface*>::value
? 1
: 0)>(std::make_tuple(&m, &P::Get(m)));
}
template <typename P>
const VTable* GetVTable() {
static constexpr VTable kVTable = {&MatchAndExplainImpl<P>,
&DescribeImpl<P>, &GetDescriberImpl<P>,
P::shared_destroy};
return &kVTable;
}
union Buffer {
// Add some types to give Buffer some common alignment/size use cases.
void* ptr;
double d;
int64_t i;
// And add one for the out-of-line cases.
SharedPayloadBase* shared;
};
void Destroy() {
if (IsShared() && buffer_.shared->Unref()) {
vtable_->shared_destroy(buffer_.shared);
}
}
template <typename M>
static constexpr bool IsInlined() {
return sizeof(M) <= sizeof(Buffer) && alignof(M) <= alignof(Buffer) &&
std::is_trivially_copy_constructible<M>::value &&
std::is_trivially_destructible<M>::value;
}
template <typename M, bool = MatcherBase::IsInlined<M>()>
struct ValuePolicy {
static const M& Get(const MatcherBase& m) {
// When inlined along with Init, need to be explicit to avoid violating
// strict aliasing rules.
const M* ptr =
static_cast<const M*>(static_cast<const void*>(&m.buffer_));
return *ptr;
}
static void Init(MatcherBase& m, M impl) {
::new (static_cast<void*>(&m.buffer_)) M(impl);
}
static constexpr auto shared_destroy = nullptr;
};
template <typename M>
struct ValuePolicy<M, false> {
using Shared = SharedPayload<M>;
static const M& Get(const MatcherBase& m) {
return static_cast<Shared*>(m.buffer_.shared)->value;
}
template <typename Arg>
static void Init(MatcherBase& m, Arg&& arg) {
m.buffer_.shared = new Shared(std::forward<Arg>(arg));
}
static constexpr auto shared_destroy = &Shared::Destroy;
};
template <typename U, bool B>
struct ValuePolicy<const MatcherInterface<U>*, B> {
using M = const MatcherInterface<U>;
using Shared = SharedPayload<std::unique_ptr<M>>;
static const M& Get(const MatcherBase& m) {
return *static_cast<Shared*>(m.buffer_.shared)->value;
}
static void Init(MatcherBase& m, M* impl) {
m.buffer_.shared = new Shared(std::unique_ptr<M>(impl));
}
static constexpr auto shared_destroy = &Shared::Destroy;
};
template <typename M>
void Init(M&& m) {
using MM = typename std::decay<M>::type;
using Policy = ValuePolicy<MM>;
vtable_ = GetVTable<Policy>();
Policy::Init(*this, std::forward<M>(m));
}
const VTable* vtable_;
Buffer buffer_;
};
} // 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) {}
template <typename M, typename = typename std::remove_reference<
M>::type::is_gtest_matcher>
Matcher(M&& m) : internal::MatcherBase<T>(std::forward<M>(m)) {} // NOLINT
// 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) {}
template <typename M, typename = typename std::remove_reference<
M>::type::is_gtest_matcher>
Matcher(M&& m) // NOLINT
: internal::MatcherBase<const std::string&>(std::forward<M>(m)) {}
// 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) {}
template <typename M, typename = typename std::remove_reference<
M>::type::is_gtest_matcher>
Matcher(M&& m) // NOLINT
: internal::MatcherBase<std::string>(std::forward<M>(m)) {}
// 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_INTERNAL_HAS_STRING_VIEW
// 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 internal::StringView&>
: public internal::MatcherBase<const internal::StringView&> {
public:
Matcher() {}
explicit Matcher(const MatcherInterface<const internal::StringView&>* impl)
: internal::MatcherBase<const internal::StringView&>(impl) {}
template <typename M, typename = typename std::remove_reference<
M>::type::is_gtest_matcher>
Matcher(M&& m) // NOLINT
: internal::MatcherBase<const internal::StringView&>(std::forward<M>(m)) {
}
// 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 or std::string_views directly.
Matcher(internal::StringView s); // NOLINT
};
template <>
class GTEST_API_ Matcher<internal::StringView>
: public internal::MatcherBase<internal::StringView> {
public:
Matcher() {}
explicit Matcher(const MatcherInterface<const internal::StringView&>* impl)
: internal::MatcherBase<internal::StringView>(impl) {}
explicit Matcher(const MatcherInterface<internal::StringView>* impl)
: internal::MatcherBase<internal::StringView>(impl) {}
template <typename M, typename = typename std::remove_reference<
M>::type::is_gtest_matcher>
Matcher(M&& m) // NOLINT
: internal::MatcherBase<internal::StringView>(std::forward<M>(m)) {}
// 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 or std::string_views directly.
Matcher(internal::StringView s); // NOLINT
};
#endif // GTEST_INTERNAL_HAS_STRING_VIEW
// 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) {}
void DescribeTo(::std::ostream* os) const override { impl_.DescribeTo(os); }
void DescribeNegationTo(::std::ostream* os) const override {
impl_.DescribeNegationTo(os);
}
bool MatchAndExplain(T x, MatchResultListener* listener) const override {
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) {}
using is_gtest_matcher = void;
template <typename Lhs>
bool MatchAndExplain(const Lhs& lhs, std::ostream*) const {
return Op()(lhs, Unwrap(rhs_));
}
void DescribeTo(std::ostream* os) const {
*os << D::Desc() << " ";
UniversalPrint(Unwrap(rhs_), os);
}
void DescribeNegationTo(std::ostream* os) const {
*os << D::NegatedDesc() << " ";
UniversalPrint(Unwrap(rhs_), os);
}
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;
}
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 >="; }
};
template <typename T, typename = typename std::enable_if<
std::is_constructible<std::string, T>::value>::type>
using StringLike = 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_INTERNAL_HAS_STRING_VIEW
bool MatchAndExplain(const internal::StringView& s,
MatchResultListener* listener) const {
return MatchAndExplain(std::string(s), listener);
}
#endif // GTEST_INTERNAL_HAS_STRING_VIEW
// 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));
}
template <typename T = std::string>
PolymorphicMatcher<internal::MatchesRegexMatcher> MatchesRegex(
const internal::StringLike<T>& regex) {
return MatchesRegex(new internal::RE(std::string(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));
}
template <typename T = std::string>
PolymorphicMatcher<internal::MatchesRegexMatcher> ContainsRegex(
const internal::StringLike<T>& regex) {
return ContainsRegex(new internal::RE(std::string(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 // GOOGLETEST_INCLUDE_GTEST_GTEST_MATCHERS_H_