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authorBilly Donahue <billydonahue@google.com>2015-08-25 21:47:18 (GMT)
committerBilly Donahue <billydonahue@google.com>2015-08-25 21:47:18 (GMT)
commitaffb09edf0dfac4e8570f99ed5af09543a7ffe4f (patch)
tree064c85249da7e9b91178342b84a4a9a3487ce0b1 /googlemock/include/gmock/gmock-actions.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.
+//
+// Author: wan@google.com (Zhanyong Wan)
+
+// Google Mock - a framework for writing C++ mock classes.
+//
+// This file implements some commonly used actions.
+
+#ifndef GMOCK_INCLUDE_GMOCK_GMOCK_ACTIONS_H_
+#define GMOCK_INCLUDE_GMOCK_GMOCK_ACTIONS_H_
+
+#ifndef _WIN32_WCE
+# include <errno.h>
+#endif
+
+#include <algorithm>
+#include <string>
+
+#include "gmock/internal/gmock-internal-utils.h"
+#include "gmock/internal/gmock-port.h"
+
+#if GTEST_LANG_CXX11 // Defined by gtest-port.h via gmock-port.h.
+#include <type_traits>
+#endif
+
+namespace testing {
+
+// To implement an action Foo, define:
+// 1. a class FooAction that implements the ActionInterface interface, and
+// 2. a factory function that creates an Action object from a
+// const FooAction*.
+//
+// The two-level delegation design follows that of Matcher, providing
+// consistency for extension developers. It also eases ownership
+// management as Action objects can now be copied like plain values.
+
+namespace internal {
+
+template <typename F1, typename F2>
+class ActionAdaptor;
+
+// BuiltInDefaultValueGetter<T, true>::Get() returns a
+// default-constructed T value. BuiltInDefaultValueGetter<T,
+// false>::Get() crashes with an error.
+//
+// This primary template is used when kDefaultConstructible is true.
+template <typename T, bool kDefaultConstructible>
+struct BuiltInDefaultValueGetter {
+ static T Get() { return T(); }
+};
+template <typename T>
+struct BuiltInDefaultValueGetter<T, false> {
+ static T Get() {
+ Assert(false, __FILE__, __LINE__,
+ "Default action undefined for the function return type.");
+ return internal::Invalid<T>();
+ // The above statement will never be reached, but is required in
+ // order for this function to compile.
+ }
+};
+
+// BuiltInDefaultValue<T>::Get() returns the "built-in" default value
+// for type T, which is NULL when T is a raw pointer type, 0 when T is
+// a numeric type, false when T is bool, or "" when T is string or
+// std::string. In addition, in C++11 and above, it turns a
+// default-constructed T value if T is default constructible. For any
+// other type T, the built-in default T value is undefined, and the
+// function will abort the process.
+template <typename T>
+class BuiltInDefaultValue {
+ public:
+#if GTEST_LANG_CXX11
+ // This function returns true iff type T has a built-in default value.
+ static bool Exists() {
+ return ::std::is_default_constructible<T>::value;
+ }
+
+ static T Get() {
+ return BuiltInDefaultValueGetter<
+ T, ::std::is_default_constructible<T>::value>::Get();
+ }
+
+#else // GTEST_LANG_CXX11
+ // This function returns true iff type T has a built-in default value.
+ static bool Exists() {
+ return false;
+ }
+
+ static T Get() {
+ return BuiltInDefaultValueGetter<T, false>::Get();
+ }
+
+#endif // GTEST_LANG_CXX11
+};
+
+// This partial specialization says that we use the same built-in
+// default value for T and const T.
+template <typename T>
+class BuiltInDefaultValue<const T> {
+ public:
+ static bool Exists() { return BuiltInDefaultValue<T>::Exists(); }
+ static T Get() { return BuiltInDefaultValue<T>::Get(); }
+};
+
+// This partial specialization defines the default values for pointer
+// types.
+template <typename T>
+class BuiltInDefaultValue<T*> {
+ public:
+ static bool Exists() { return true; }
+ static T* Get() { return NULL; }
+};
+
+// The following specializations define the default values for
+// specific types we care about.
+#define GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(type, value) \
+ template <> \
+ class BuiltInDefaultValue<type> { \
+ public: \
+ static bool Exists() { return true; } \
+ static type Get() { return value; } \
+ }
+
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(void, ); // NOLINT
+#if GTEST_HAS_GLOBAL_STRING
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(::string, "");
+#endif // GTEST_HAS_GLOBAL_STRING
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(::std::string, "");
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(bool, false);
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned char, '\0');
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed char, '\0');
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(char, '\0');
+
+// There's no need for a default action for signed wchar_t, as that
+// type is the same as wchar_t for gcc, and invalid for MSVC.
+//
+// There's also no need for a default action for unsigned wchar_t, as
+// that type is the same as unsigned int for gcc, and invalid for
+// MSVC.
+#if GMOCK_WCHAR_T_IS_NATIVE_
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(wchar_t, 0U); // NOLINT
+#endif
+
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned short, 0U); // NOLINT
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed short, 0); // NOLINT
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned int, 0U);
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed int, 0);
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(unsigned long, 0UL); // NOLINT
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(signed long, 0L); // NOLINT
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(UInt64, 0);
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(Int64, 0);
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(float, 0);
+GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_(double, 0);
+
+#undef GMOCK_DEFINE_DEFAULT_ACTION_FOR_RETURN_TYPE_
+
+} // namespace internal
+
+// When an unexpected function call is encountered, Google Mock will
+// let it return a default value if the user has specified one for its
+// return type, or if the return type has a built-in default value;
+// otherwise Google Mock won't know what value to return and will have
+// to abort the process.
+//
+// The DefaultValue<T> class allows a user to specify the
+// default value for a type T that is both copyable and publicly
+// destructible (i.e. anything that can be used as a function return
+// type). The usage is:
+//
+// // Sets the default value for type T to be foo.
+// DefaultValue<T>::Set(foo);
+template <typename T>
+class DefaultValue {
+ public:
+ // Sets the default value for type T; requires T to be
+ // copy-constructable and have a public destructor.
+ static void Set(T x) {
+ delete producer_;
+ producer_ = new FixedValueProducer(x);
+ }
+
+ // Provides a factory function to be called to generate the default value.
+ // This method can be used even if T is only move-constructible, but it is not
+ // limited to that case.
+ typedef T (*FactoryFunction)();
+ static void SetFactory(FactoryFunction factory) {
+ delete producer_;
+ producer_ = new FactoryValueProducer(factory);
+ }
+
+ // Unsets the default value for type T.
+ static void Clear() {
+ delete producer_;
+ producer_ = NULL;
+ }
+
+ // Returns true iff the user has set the default value for type T.
+ static bool IsSet() { return producer_ != NULL; }
+
+ // Returns true if T has a default return value set by the user or there
+ // exists a built-in default value.
+ static bool Exists() {
+ return IsSet() || internal::BuiltInDefaultValue<T>::Exists();
+ }
+
+ // Returns the default value for type T if the user has set one;
+ // otherwise returns the built-in default value. Requires that Exists()
+ // is true, which ensures that the return value is well-defined.
+ static T Get() {
+ return producer_ == NULL ?
+ internal::BuiltInDefaultValue<T>::Get() : producer_->Produce();
+ }
+
+ private:
+ class ValueProducer {
+ public:
+ virtual ~ValueProducer() {}
+ virtual T Produce() = 0;
+ };
+
+ class FixedValueProducer : public ValueProducer {
+ public:
+ explicit FixedValueProducer(T value) : value_(value) {}
+ virtual T Produce() { return value_; }
+
+ private:
+ const T value_;
+ GTEST_DISALLOW_COPY_AND_ASSIGN_(FixedValueProducer);
+ };
+
+ class FactoryValueProducer : public ValueProducer {
+ public:
+ explicit FactoryValueProducer(FactoryFunction factory)
+ : factory_(factory) {}
+ virtual T Produce() { return factory_(); }
+
+ private:
+ const FactoryFunction factory_;
+ GTEST_DISALLOW_COPY_AND_ASSIGN_(FactoryValueProducer);
+ };
+
+ static ValueProducer* producer_;
+};
+
+// This partial specialization allows a user to set default values for
+// reference types.
+template <typename T>
+class DefaultValue<T&> {
+ public:
+ // Sets the default value for type T&.
+ static void Set(T& x) { // NOLINT
+ address_ = &x;
+ }
+
+ // Unsets the default value for type T&.
+ static void Clear() {
+ address_ = NULL;
+ }
+
+ // Returns true iff the user has set the default value for type T&.
+ static bool IsSet() { return address_ != NULL; }
+
+ // Returns true if T has a default return value set by the user or there
+ // exists a built-in default value.
+ static bool Exists() {
+ return IsSet() || internal::BuiltInDefaultValue<T&>::Exists();
+ }
+
+ // Returns the default value for type T& if the user has set one;
+ // otherwise returns the built-in default value if there is one;
+ // otherwise aborts the process.
+ static T& Get() {
+ return address_ == NULL ?
+ internal::BuiltInDefaultValue<T&>::Get() : *address_;
+ }
+
+ private:
+ static T* address_;
+};
+
+// This specialization allows DefaultValue<void>::Get() to
+// compile.
+template <>
+class DefaultValue<void> {
+ public:
+ static bool Exists() { return true; }
+ static void Get() {}
+};
+
+// Points to the user-set default value for type T.
+template <typename T>
+typename DefaultValue<T>::ValueProducer* DefaultValue<T>::producer_ = NULL;
+
+// Points to the user-set default value for type T&.
+template <typename T>
+T* DefaultValue<T&>::address_ = NULL;
+
+// Implement this interface to define an action for function type F.
+template <typename F>
+class ActionInterface {
+ public:
+ typedef typename internal::Function<F>::Result Result;
+ typedef typename internal::Function<F>::ArgumentTuple ArgumentTuple;
+
+ ActionInterface() {}
+ virtual ~ActionInterface() {}
+
+ // Performs the action. This method is not const, as in general an
+ // action can have side effects and be stateful. For example, a
+ // get-the-next-element-from-the-collection action will need to
+ // remember the current element.
+ virtual Result Perform(const ArgumentTuple& args) = 0;
+
+ private:
+ GTEST_DISALLOW_COPY_AND_ASSIGN_(ActionInterface);
+};
+
+// An Action<F> is a copyable and IMMUTABLE (except by assignment)
+// object that represents an action to be taken when a mock function
+// of type F is called. The implementation of Action<T> is just a
+// linked_ptr to const ActionInterface<T>, so copying is fairly cheap.
+// Don't inherit from Action!
+//
+// You can view an object implementing ActionInterface<F> as a
+// concrete action (including its current state), and an Action<F>
+// object as a handle to it.
+template <typename F>
+class Action {
+ public:
+ typedef typename internal::Function<F>::Result Result;
+ typedef typename internal::Function<F>::ArgumentTuple ArgumentTuple;
+
+ // Constructs a null Action. Needed for storing Action objects in
+ // STL containers.
+ Action() : impl_(NULL) {}
+
+ // Constructs an Action from its implementation. A NULL impl is
+ // used to represent the "do-default" action.
+ explicit Action(ActionInterface<F>* impl) : impl_(impl) {}
+
+ // Copy constructor.
+ Action(const Action& action) : impl_(action.impl_) {}
+
+ // This constructor allows us to turn an Action<Func> object into an
+ // Action<F>, as long as F's arguments can be implicitly converted
+ // to Func's and Func's return type can be implicitly converted to
+ // F's.
+ template <typename Func>
+ explicit Action(const Action<Func>& action);
+
+ // Returns true iff this is the DoDefault() action.
+ bool IsDoDefault() const { return impl_.get() == NULL; }
+
+ // Performs the action. Note that this method is const even though
+ // the corresponding method in ActionInterface is not. The reason
+ // is that a const Action<F> means that it cannot be re-bound to
+ // another concrete action, not that the concrete action it binds to
+ // cannot change state. (Think of the difference between a const
+ // pointer and a pointer to const.)
+ Result Perform(const ArgumentTuple& args) const {
+ internal::Assert(
+ !IsDoDefault(), __FILE__, __LINE__,
+ "You are using DoDefault() inside a composite action like "
+ "DoAll() or WithArgs(). This is not supported for technical "
+ "reasons. Please instead spell out the default action, or "
+ "assign the default action to an Action variable and use "
+ "the variable in various places.");
+ return impl_->Perform(args);
+ }
+
+ private:
+ template <typename F1, typename F2>
+ friend class internal::ActionAdaptor;
+
+ internal::linked_ptr<ActionInterface<F> > impl_;
+};
+
+// The PolymorphicAction class template makes it easy to implement a
+// polymorphic action (i.e. an action that can be used in mock
+// functions of than one type, e.g. Return()).
+//
+// To define a polymorphic action, a user first provides a COPYABLE
+// implementation class that has a Perform() method template:
+//
+// class FooAction {
+// public:
+// template <typename Result, typename ArgumentTuple>
+// Result Perform(const ArgumentTuple& args) const {
+// // Processes the arguments and returns a result, using
+// // tr1::get<N>(args) to get the N-th (0-based) argument in the tuple.
+// }
+// ...
+// };
+//
+// Then the user creates the polymorphic action using
+// MakePolymorphicAction(object) where object has type FooAction. See
+// the definition of Return(void) and SetArgumentPointee<N>(value) for
+// complete examples.
+template <typename Impl>
+class PolymorphicAction {
+ public:
+ explicit PolymorphicAction(const Impl& impl) : impl_(impl) {}
+
+ template <typename F>
+ operator Action<F>() const {
+ return Action<F>(new MonomorphicImpl<F>(impl_));
+ }
+
+ private:
+ template <typename F>
+ class MonomorphicImpl : public ActionInterface<F> {
+ public:
+ typedef typename internal::Function<F>::Result Result;
+ typedef typename internal::Function<F>::ArgumentTuple ArgumentTuple;
+
+ explicit MonomorphicImpl(const Impl& impl) : impl_(impl) {}
+
+ virtual Result Perform(const ArgumentTuple& args) {
+ return impl_.template Perform<Result>(args);
+ }
+
+ private:
+ Impl impl_;
+
+ GTEST_DISALLOW_ASSIGN_(MonomorphicImpl);
+ };
+
+ Impl impl_;
+
+ GTEST_DISALLOW_ASSIGN_(PolymorphicAction);
+};
+
+// Creates an Action from its implementation and returns it. The
+// created Action object owns the implementation.
+template <typename F>
+Action<F> MakeAction(ActionInterface<F>* impl) {
+ return Action<F>(impl);
+}
+
+// Creates a polymorphic action from its implementation. This is
+// easier to use than the PolymorphicAction<Impl> constructor as it
+// doesn't require you to explicitly write the template argument, e.g.
+//
+// MakePolymorphicAction(foo);
+// vs
+// PolymorphicAction<TypeOfFoo>(foo);
+template <typename Impl>
+inline PolymorphicAction<Impl> MakePolymorphicAction(const Impl& impl) {
+ return PolymorphicAction<Impl>(impl);
+}
+
+namespace internal {
+
+// Allows an Action<F2> object to pose as an Action<F1>, as long as F2
+// and F1 are compatible.
+template <typename F1, typename F2>
+class ActionAdaptor : public ActionInterface<F1> {
+ public:
+ typedef typename internal::Function<F1>::Result Result;
+ typedef typename internal::Function<F1>::ArgumentTuple ArgumentTuple;
+
+ explicit ActionAdaptor(const Action<F2>& from) : impl_(from.impl_) {}
+
+ virtual Result Perform(const ArgumentTuple& args) {
+ return impl_->Perform(args);
+ }
+
+ private:
+ const internal::linked_ptr<ActionInterface<F2> > impl_;
+
+ GTEST_DISALLOW_ASSIGN_(ActionAdaptor);
+};
+
+// Helper struct to specialize ReturnAction to execute a move instead of a copy
+// on return. Useful for move-only types, but could be used on any type.
+template <typename T>
+struct ByMoveWrapper {
+ explicit ByMoveWrapper(T value) : payload(internal::move(value)) {}
+ T payload;
+};
+
+// Implements the polymorphic Return(x) action, which can be used in
+// any function that returns the type of x, regardless of the argument
+// types.
+//
+// Note: The value passed into Return must be converted into
+// Function<F>::Result when this action is cast to Action<F> rather than
+// when that action is performed. This is important in scenarios like
+//
+// MOCK_METHOD1(Method, T(U));
+// ...
+// {
+// Foo foo;
+// X x(&foo);
+// EXPECT_CALL(mock, Method(_)).WillOnce(Return(x));
+// }
+//
+// In the example above the variable x holds reference to foo which leaves
+// scope and gets destroyed. If copying X just copies a reference to foo,
+// that copy will be left with a hanging reference. If conversion to T
+// makes a copy of foo, the above code is safe. To support that scenario, we
+// need to make sure that the type conversion happens inside the EXPECT_CALL
+// statement, and conversion of the result of Return to Action<T(U)> is a
+// good place for that.
+//
+template <typename R>
+class ReturnAction {
+ public:
+ // Constructs a ReturnAction object from the value to be returned.
+ // 'value' is passed by value instead of by const reference in order
+ // to allow Return("string literal") to compile.
+ explicit ReturnAction(R value) : value_(new R(internal::move(value))) {}
+
+ // This template type conversion operator allows Return(x) to be
+ // used in ANY function that returns x's type.
+ template <typename F>
+ operator Action<F>() const {
+ // Assert statement belongs here because this is the best place to verify
+ // conditions on F. It produces the clearest error messages
+ // in most compilers.
+ // Impl really belongs in this scope as a local class but can't
+ // because MSVC produces duplicate symbols in different translation units
+ // in this case. Until MS fixes that bug we put Impl into the class scope
+ // and put the typedef both here (for use in assert statement) and
+ // in the Impl class. But both definitions must be the same.
+ typedef typename Function<F>::Result Result;
+ GTEST_COMPILE_ASSERT_(
+ !is_reference<Result>::value,
+ use_ReturnRef_instead_of_Return_to_return_a_reference);
+ return Action<F>(new Impl<R, F>(value_));
+ }
+
+ private:
+ // Implements the Return(x) action for a particular function type F.
+ template <typename R_, typename F>
+ class Impl : public ActionInterface<F> {
+ public:
+ typedef typename Function<F>::Result Result;
+ typedef typename Function<F>::ArgumentTuple ArgumentTuple;
+
+ // The implicit cast is necessary when Result has more than one
+ // single-argument constructor (e.g. Result is std::vector<int>) and R
+ // has a type conversion operator template. In that case, value_(value)
+ // won't compile as the compiler doesn't known which constructor of
+ // Result to call. ImplicitCast_ forces the compiler to convert R to
+ // Result without considering explicit constructors, thus resolving the
+ // ambiguity. value_ is then initialized using its copy constructor.
+ explicit Impl(const linked_ptr<R>& value)
+ : value_before_cast_(*value),
+ value_(ImplicitCast_<Result>(value_before_cast_)) {}
+
+ virtual Result Perform(const ArgumentTuple&) { return value_; }
+
+ private:
+ GTEST_COMPILE_ASSERT_(!is_reference<Result>::value,
+ Result_cannot_be_a_reference_type);
+ // We save the value before casting just in case it is being cast to a
+ // wrapper type.
+ R value_before_cast_;
+ Result value_;
+
+ GTEST_DISALLOW_COPY_AND_ASSIGN_(Impl);
+ };
+
+ // Partially specialize for ByMoveWrapper. This version of ReturnAction will
+ // move its contents instead.
+ template <typename R_, typename F>
+ class Impl<ByMoveWrapper<R_>, F> : public ActionInterface<F> {
+ public:
+ typedef typename Function<F>::Result Result;
+ typedef typename Function<F>::ArgumentTuple ArgumentTuple;
+
+ explicit Impl(const linked_ptr<R>& wrapper)
+ : performed_(false), wrapper_(wrapper) {}
+
+ virtual Result Perform(const ArgumentTuple&) {
+ GTEST_CHECK_(!performed_)
+ << "A ByMove() action should only be performed once.";
+ performed_ = true;
+ return internal::move(wrapper_->payload);
+ }
+
+ private:
+ bool performed_;
+ const linked_ptr<R> wrapper_;
+
+ GTEST_DISALLOW_ASSIGN_(Impl);
+ };
+
+ const linked_ptr<R> value_;
+
+ GTEST_DISALLOW_ASSIGN_(ReturnAction);
+};
+
+// Implements the ReturnNull() action.
+class ReturnNullAction {
+ public:
+ // Allows ReturnNull() to be used in any pointer-returning function. In C++11
+ // this is enforced by returning nullptr, and in non-C++11 by asserting a
+ // pointer type on compile time.
+ template <typename Result, typename ArgumentTuple>
+ static Result Perform(const ArgumentTuple&) {
+#if GTEST_LANG_CXX11
+ return nullptr;
+#else
+ GTEST_COMPILE_ASSERT_(internal::is_pointer<Result>::value,
+ ReturnNull_can_be_used_to_return_a_pointer_only);
+ return NULL;
+#endif // GTEST_LANG_CXX11
+ }
+};
+
+// Implements the Return() action.
+class ReturnVoidAction {
+ public:
+ // Allows Return() to be used in any void-returning function.
+ template <typename Result, typename ArgumentTuple>
+ static void Perform(const ArgumentTuple&) {
+ CompileAssertTypesEqual<void, Result>();
+ }
+};
+
+// Implements the polymorphic ReturnRef(x) action, which can be used
+// in any function that returns a reference to the type of x,
+// regardless of the argument types.
+template <typename T>
+class ReturnRefAction {
+ public:
+ // Constructs a ReturnRefAction object from the reference to be returned.
+ explicit ReturnRefAction(T& ref) : ref_(ref) {} // NOLINT
+
+ // This template type conversion operator allows ReturnRef(x) to be
+ // used in ANY function that returns a reference to x's type.
+ template <typename F>
+ operator Action<F>() const {
+ typedef typename Function<F>::Result Result;
+ // Asserts that the function return type is a reference. This
+ // catches the user error of using ReturnRef(x) when Return(x)
+ // should be used, and generates some helpful error message.
+ GTEST_COMPILE_ASSERT_(internal::is_reference<Result>::value,
+ use_Return_instead_of_ReturnRef_to_return_a_value);
+ return Action<F>(new Impl<F>(ref_));
+ }
+
+ private:
+ // Implements the ReturnRef(x) action for a particular function type F.
+ template <typename F>
+ class Impl : public ActionInterface<F> {
+ public:
+ typedef typename Function<F>::Result Result;
+ typedef typename Function<F>::ArgumentTuple ArgumentTuple;
+
+ explicit Impl(T& ref) : ref_(ref) {} // NOLINT
+
+ virtual Result Perform(const ArgumentTuple&) {
+ return ref_;
+ }
+
+ private:
+ T& ref_;
+
+ GTEST_DISALLOW_ASSIGN_(Impl);
+ };
+
+ T& ref_;
+
+ GTEST_DISALLOW_ASSIGN_(ReturnRefAction);
+};
+
+// Implements the polymorphic ReturnRefOfCopy(x) action, which can be
+// used in any function that returns a reference to the type of x,
+// regardless of the argument types.
+template <typename T>
+class ReturnRefOfCopyAction {
+ public:
+ // Constructs a ReturnRefOfCopyAction object from the reference to
+ // be returned.
+ explicit ReturnRefOfCopyAction(const T& value) : value_(value) {} // NOLINT
+
+ // This template type conversion operator allows ReturnRefOfCopy(x) to be
+ // used in ANY function that returns a reference to x's type.
+ template <typename F>
+ operator Action<F>() const {
+ typedef typename Function<F>::Result Result;
+ // Asserts that the function return type is a reference. This
+ // catches the user error of using ReturnRefOfCopy(x) when Return(x)
+ // should be used, and generates some helpful error message.
+ GTEST_COMPILE_ASSERT_(
+ internal::is_reference<Result>::value,
+ use_Return_instead_of_ReturnRefOfCopy_to_return_a_value);
+ return Action<F>(new Impl<F>(value_));
+ }
+
+ private:
+ // Implements the ReturnRefOfCopy(x) action for a particular function type F.
+ template <typename F>
+ class Impl : public ActionInterface<F> {
+ public:
+ typedef typename Function<F>::Result Result;
+ typedef typename Function<F>::ArgumentTuple ArgumentTuple;
+
+ explicit Impl(const T& value) : value_(value) {} // NOLINT
+
+ virtual Result Perform(const ArgumentTuple&) {
+ return value_;
+ }
+
+ private:
+ T value_;
+
+ GTEST_DISALLOW_ASSIGN_(Impl);
+ };
+
+ const T value_;
+
+ GTEST_DISALLOW_ASSIGN_(ReturnRefOfCopyAction);
+};
+
+// Implements the polymorphic DoDefault() action.
+class DoDefaultAction {
+ public:
+ // This template type conversion operator allows DoDefault() to be
+ // used in any function.
+ template <typename F>
+ operator Action<F>() const { return Action<F>(NULL); }
+};
+
+// Implements the Assign action to set a given pointer referent to a
+// particular value.
+template <typename T1, typename T2>
+class AssignAction {
+ public:
+ AssignAction(T1* ptr, T2 value) : ptr_(ptr), value_(value) {}
+
+ template <typename Result, typename ArgumentTuple>
+ void Perform(const ArgumentTuple& /* args */) const {
+ *ptr_ = value_;
+ }
+
+ private:
+ T1* const ptr_;
+ const T2 value_;
+
+ GTEST_DISALLOW_ASSIGN_(AssignAction);
+};
+
+#if !GTEST_OS_WINDOWS_MOBILE
+
+// Implements the SetErrnoAndReturn action to simulate return from
+// various system calls and libc functions.
+template <typename T>
+class SetErrnoAndReturnAction {
+ public:
+ SetErrnoAndReturnAction(int errno_value, T result)
+ : errno_(errno_value),
+ result_(result) {}
+ template <typename Result, typename ArgumentTuple>
+ Result Perform(const ArgumentTuple& /* args */) const {
+ errno = errno_;
+ return result_;
+ }
+
+ private:
+ const int errno_;
+ const T result_;
+
+ GTEST_DISALLOW_ASSIGN_(SetErrnoAndReturnAction);
+};
+
+#endif // !GTEST_OS_WINDOWS_MOBILE
+
+// Implements the SetArgumentPointee<N>(x) action for any function
+// whose N-th argument (0-based) is a pointer to x's type. The
+// template parameter kIsProto is true iff type A is ProtocolMessage,
+// proto2::Message, or a sub-class of those.
+template <size_t N, typename A, bool kIsProto>
+class SetArgumentPointeeAction {
+ public:
+ // Constructs an action that sets the variable pointed to by the
+ // N-th function argument to 'value'.
+ explicit SetArgumentPointeeAction(const A& value) : value_(value) {}
+
+ template <typename Result, typename ArgumentTuple>
+ void Perform(const ArgumentTuple& args) const {
+ CompileAssertTypesEqual<void, Result>();
+ *::testing::get<N>(args) = value_;
+ }
+
+ private:
+ const A value_;
+
+ GTEST_DISALLOW_ASSIGN_(SetArgumentPointeeAction);
+};
+
+template <size_t N, typename Proto>
+class SetArgumentPointeeAction<N, Proto, true> {
+ public:
+ // Constructs an action that sets the variable pointed to by the
+ // N-th function argument to 'proto'. Both ProtocolMessage and
+ // proto2::Message have the CopyFrom() method, so the same
+ // implementation works for both.
+ explicit SetArgumentPointeeAction(const Proto& proto) : proto_(new Proto) {
+ proto_->CopyFrom(proto);
+ }
+
+ template <typename Result, typename ArgumentTuple>
+ void Perform(const ArgumentTuple& args) const {
+ CompileAssertTypesEqual<void, Result>();
+ ::testing::get<N>(args)->CopyFrom(*proto_);
+ }
+
+ private:
+ const internal::linked_ptr<Proto> proto_;
+
+ GTEST_DISALLOW_ASSIGN_(SetArgumentPointeeAction);
+};
+
+// Implements the InvokeWithoutArgs(f) action. The template argument
+// FunctionImpl is the implementation type of f, which can be either a
+// function pointer or a functor. InvokeWithoutArgs(f) can be used as an
+// Action<F> as long as f's type is compatible with F (i.e. f can be
+// assigned to a tr1::function<F>).
+template <typename FunctionImpl>
+class InvokeWithoutArgsAction {
+ public:
+ // The c'tor makes a copy of function_impl (either a function
+ // pointer or a functor).
+ explicit InvokeWithoutArgsAction(FunctionImpl function_impl)
+ : function_impl_(function_impl) {}
+
+ // Allows InvokeWithoutArgs(f) to be used as any action whose type is
+ // compatible with f.
+ template <typename Result, typename ArgumentTuple>
+ Result Perform(const ArgumentTuple&) { return function_impl_(); }
+
+ private:
+ FunctionImpl function_impl_;
+
+ GTEST_DISALLOW_ASSIGN_(InvokeWithoutArgsAction);
+};
+
+// Implements the InvokeWithoutArgs(object_ptr, &Class::Method) action.
+template <class Class, typename MethodPtr>
+class InvokeMethodWithoutArgsAction {
+ public:
+ InvokeMethodWithoutArgsAction(Class* obj_ptr, MethodPtr method_ptr)
+ : obj_ptr_(obj_ptr), method_ptr_(method_ptr) {}
+
+ template <typename Result, typename ArgumentTuple>
+ Result Perform(const ArgumentTuple&) const {
+ return (obj_ptr_->*method_ptr_)();
+ }
+
+ private:
+ Class* const obj_ptr_;
+ const MethodPtr method_ptr_;
+
+ GTEST_DISALLOW_ASSIGN_(InvokeMethodWithoutArgsAction);
+};
+
+// Implements the IgnoreResult(action) action.
+template <typename A>
+class IgnoreResultAction {
+ public:
+ explicit IgnoreResultAction(const A& action) : action_(action) {}
+
+ template <typename F>
+ operator Action<F>() const {
+ // Assert statement belongs here because this is the best place to verify
+ // conditions on F. It produces the clearest error messages
+ // in most compilers.
+ // Impl really belongs in this scope as a local class but can't
+ // because MSVC produces duplicate symbols in different translation units
+ // in this case. Until MS fixes that bug we put Impl into the class scope
+ // and put the typedef both here (for use in assert statement) and
+ // in the Impl class. But both definitions must be the same.
+ typedef typename internal::Function<F>::Result Result;
+
+ // Asserts at compile time that F returns void.
+ CompileAssertTypesEqual<void, Result>();
+
+ return Action<F>(new Impl<F>(action_));
+ }
+
+ private:
+ template <typename F>
+ class Impl : public ActionInterface<F> {
+ public:
+ typedef typename internal::Function<F>::Result Result;
+ typedef typename internal::Function<F>::ArgumentTuple ArgumentTuple;
+
+ explicit Impl(const A& action) : action_(action) {}
+
+ virtual void Perform(const ArgumentTuple& args) {
+ // Performs the action and ignores its result.
+ action_.Perform(args);
+ }
+
+ private:
+ // Type OriginalFunction is the same as F except that its return
+ // type is IgnoredValue.
+ typedef typename internal::Function<F>::MakeResultIgnoredValue
+ OriginalFunction;
+
+ const Action<OriginalFunction> action_;
+
+ GTEST_DISALLOW_ASSIGN_(Impl);
+ };
+
+ const A action_;
+
+ GTEST_DISALLOW_ASSIGN_(IgnoreResultAction);
+};
+
+// A ReferenceWrapper<T> object represents a reference to type T,
+// which can be either const or not. It can be explicitly converted
+// from, and implicitly converted to, a T&. Unlike a reference,
+// ReferenceWrapper<T> can be copied and can survive template type
+// inference. This is used to support by-reference arguments in the
+// InvokeArgument<N>(...) action. The idea was from "reference
+// wrappers" in tr1, which we don't have in our source tree yet.
+template <typename T>
+class ReferenceWrapper {
+ public:
+ // Constructs a ReferenceWrapper<T> object from a T&.
+ explicit ReferenceWrapper(T& l_value) : pointer_(&l_value) {} // NOLINT
+
+ // Allows a ReferenceWrapper<T> object to be implicitly converted to
+ // a T&.
+ operator T&() const { return *pointer_; }
+ private:
+ T* pointer_;
+};
+
+// Allows the expression ByRef(x) to be printed as a reference to x.
+template <typename T>
+void PrintTo(const ReferenceWrapper<T>& ref, ::std::ostream* os) {
+ T& value = ref;
+ UniversalPrinter<T&>::Print(value, os);
+}
+
+// Does two actions sequentially. Used for implementing the DoAll(a1,
+// a2, ...) action.
+template <typename Action1, typename Action2>
+class DoBothAction {
+ public:
+ DoBothAction(Action1 action1, Action2 action2)
+ : action1_(action1), action2_(action2) {}
+
+ // This template type conversion operator allows DoAll(a1, ..., a_n)
+ // to be used in ANY function of compatible type.
+ template <typename F>
+ operator Action<F>() const {
+ return Action<F>(new Impl<F>(action1_, action2_));
+ }
+
+ private:
+ // Implements the DoAll(...) action for a particular function type F.
+ template <typename F>
+ class Impl : public ActionInterface<F> {
+ public:
+ typedef typename Function<F>::Result Result;
+ typedef typename Function<F>::ArgumentTuple ArgumentTuple;
+ typedef typename Function<F>::MakeResultVoid VoidResult;
+
+ Impl(const Action<VoidResult>& action1, const Action<F>& action2)
+ : action1_(action1), action2_(action2) {}
+
+ virtual Result Perform(const ArgumentTuple& args) {
+ action1_.Perform(args);
+ return action2_.Perform(args);
+ }
+
+ private:
+ const Action<VoidResult> action1_;
+ const Action<F> action2_;
+
+ GTEST_DISALLOW_ASSIGN_(Impl);
+ };
+
+ Action1 action1_;
+ Action2 action2_;
+
+ GTEST_DISALLOW_ASSIGN_(DoBothAction);
+};
+
+} // namespace internal
+
+// An Unused object can be implicitly constructed from ANY value.
+// This is handy when defining actions that ignore some or all of the
+// mock function arguments. For example, given
+//
+// MOCK_METHOD3(Foo, double(const string& label, double x, double y));
+// MOCK_METHOD3(Bar, double(int index, double x, double y));
+//
+// instead of
+//
+// double DistanceToOriginWithLabel(const string& label, double x, double y) {
+// return sqrt(x*x + y*y);
+// }
+// double DistanceToOriginWithIndex(int index, double x, double y) {
+// return sqrt(x*x + y*y);
+// }
+// ...
+// EXEPCT_CALL(mock, Foo("abc", _, _))
+// .WillOnce(Invoke(DistanceToOriginWithLabel));
+// EXEPCT_CALL(mock, Bar(5, _, _))
+// .WillOnce(Invoke(DistanceToOriginWithIndex));
+//
+// you could write
+//
+// // We can declare any uninteresting argument as Unused.
+// double DistanceToOrigin(Unused, double x, double y) {
+// return sqrt(x*x + y*y);
+// }
+// ...
+// EXEPCT_CALL(mock, Foo("abc", _, _)).WillOnce(Invoke(DistanceToOrigin));
+// EXEPCT_CALL(mock, Bar(5, _, _)).WillOnce(Invoke(DistanceToOrigin));
+typedef internal::IgnoredValue Unused;
+
+// This constructor allows us to turn an Action<From> object into an
+// Action<To>, as long as To's arguments can be implicitly converted
+// to From's and From's return type cann be implicitly converted to
+// To's.
+template <typename To>
+template <typename From>
+Action<To>::Action(const Action<From>& from)
+ : impl_(new internal::ActionAdaptor<To, From>(from)) {}
+
+// Creates an action that returns 'value'. 'value' is passed by value
+// instead of const reference - otherwise Return("string literal")
+// will trigger a compiler error about using array as initializer.
+template <typename R>
+internal::ReturnAction<R> Return(R value) {
+ return internal::ReturnAction<R>(internal::move(value));
+}
+
+// Creates an action that returns NULL.
+inline PolymorphicAction<internal::ReturnNullAction> ReturnNull() {
+ return MakePolymorphicAction(internal::ReturnNullAction());
+}
+
+// Creates an action that returns from a void function.
+inline PolymorphicAction<internal::ReturnVoidAction> Return() {
+ return MakePolymorphicAction(internal::ReturnVoidAction());
+}
+
+// Creates an action that returns the reference to a variable.
+template <typename R>
+inline internal::ReturnRefAction<R> ReturnRef(R& x) { // NOLINT
+ return internal::ReturnRefAction<R>(x);
+}
+
+// Creates an action that returns the reference to a copy of the
+// argument. The copy is created when the action is constructed and
+// lives as long as the action.
+template <typename R>
+inline internal::ReturnRefOfCopyAction<R> ReturnRefOfCopy(const R& x) {
+ return internal::ReturnRefOfCopyAction<R>(x);
+}
+
+// Modifies the parent action (a Return() action) to perform a move of the
+// argument instead of a copy.
+// Return(ByMove()) actions can only be executed once and will assert this
+// invariant.
+template <typename R>
+internal::ByMoveWrapper<R> ByMove(R x) {
+ return internal::ByMoveWrapper<R>(internal::move(x));
+}
+
+// Creates an action that does the default action for the give mock function.
+inline internal::DoDefaultAction DoDefault() {
+ return internal::DoDefaultAction();
+}
+
+// Creates an action that sets the variable pointed by the N-th
+// (0-based) function argument to 'value'.
+template <size_t N, typename T>
+PolymorphicAction<
+ internal::SetArgumentPointeeAction<
+ N, T, internal::IsAProtocolMessage<T>::value> >
+SetArgPointee(const T& x) {
+ return MakePolymorphicAction(internal::SetArgumentPointeeAction<
+ N, T, internal::IsAProtocolMessage<T>::value>(x));
+}
+
+#if !((GTEST_GCC_VER_ && GTEST_GCC_VER_ < 40000) || GTEST_OS_SYMBIAN)
+// This overload allows SetArgPointee() to accept a string literal.
+// GCC prior to the version 4.0 and Symbian C++ compiler cannot distinguish
+// this overload from the templated version and emit a compile error.
+template <size_t N>
+PolymorphicAction<
+ internal::SetArgumentPointeeAction<N, const char*, false> >
+SetArgPointee(const char* p) {
+ return MakePolymorphicAction(internal::SetArgumentPointeeAction<
+ N, const char*, false>(p));
+}
+
+template <size_t N>
+PolymorphicAction<
+ internal::SetArgumentPointeeAction<N, const wchar_t*, false> >
+SetArgPointee(const wchar_t* p) {
+ return MakePolymorphicAction(internal::SetArgumentPointeeAction<
+ N, const wchar_t*, false>(p));
+}
+#endif
+
+// The following version is DEPRECATED.
+template <size_t N, typename T>
+PolymorphicAction<
+ internal::SetArgumentPointeeAction<
+ N, T, internal::IsAProtocolMessage<T>::value> >
+SetArgumentPointee(const T& x) {
+ return MakePolymorphicAction(internal::SetArgumentPointeeAction<
+ N, T, internal::IsAProtocolMessage<T>::value>(x));
+}
+
+// Creates an action that sets a pointer referent to a given value.
+template <typename T1, typename T2>
+PolymorphicAction<internal::AssignAction<T1, T2> > Assign(T1* ptr, T2 val) {
+ return MakePolymorphicAction(internal::AssignAction<T1, T2>(ptr, val));
+}
+
+#if !GTEST_OS_WINDOWS_MOBILE
+
+// Creates an action that sets errno and returns the appropriate error.
+template <typename T>
+PolymorphicAction<internal::SetErrnoAndReturnAction<T> >
+SetErrnoAndReturn(int errval, T result) {
+ return MakePolymorphicAction(
+ internal::SetErrnoAndReturnAction<T>(errval, result));
+}
+
+#endif // !GTEST_OS_WINDOWS_MOBILE
+
+// Various overloads for InvokeWithoutArgs().
+
+// Creates an action that invokes 'function_impl' with no argument.
+template <typename FunctionImpl>
+PolymorphicAction<internal::InvokeWithoutArgsAction<FunctionImpl> >
+InvokeWithoutArgs(FunctionImpl function_impl) {
+ return MakePolymorphicAction(
+ internal::InvokeWithoutArgsAction<FunctionImpl>(function_impl));
+}
+
+// Creates an action that invokes the given method on the given object
+// with no argument.
+template <class Class, typename MethodPtr>
+PolymorphicAction<internal::InvokeMethodWithoutArgsAction<Class, MethodPtr> >
+InvokeWithoutArgs(Class* obj_ptr, MethodPtr method_ptr) {
+ return MakePolymorphicAction(
+ internal::InvokeMethodWithoutArgsAction<Class, MethodPtr>(
+ obj_ptr, method_ptr));
+}
+
+// Creates an action that performs an_action and throws away its
+// result. In other words, it changes the return type of an_action to
+// void. an_action MUST NOT return void, or the code won't compile.
+template <typename A>
+inline internal::IgnoreResultAction<A> IgnoreResult(const A& an_action) {
+ return internal::IgnoreResultAction<A>(an_action);
+}
+
+// Creates a reference wrapper for the given L-value. If necessary,
+// you can explicitly specify the type of the reference. For example,
+// suppose 'derived' is an object of type Derived, ByRef(derived)
+// would wrap a Derived&. If you want to wrap a const Base& instead,
+// where Base is a base class of Derived, just write:
+//
+// ByRef<const Base>(derived)
+template <typename T>
+inline internal::ReferenceWrapper<T> ByRef(T& l_value) { // NOLINT
+ return internal::ReferenceWrapper<T>(l_value);
+}
+
+} // namespace testing
+
+#endif // GMOCK_INCLUDE_GMOCK_GMOCK_ACTIONS_H_