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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// A mixin class that makes it easy to assert on test object
// instance counts.
#ifndef CEEE_TESTING_UTILS_INSTANCE_COUNT_MIXIN_H_
#define CEEE_TESTING_UTILS_INSTANCE_COUNT_MIXIN_H_
#include <string>
#include <set>
#include "base/synchronization/lock.h"
namespace testing {
// A base class for the InstanceCountMixin template class below.
// The base class keeps a set of all derived class instances,
// which allows tests to assert on object counts and to enumerate
// leaked objects.
class InstanceCountMixinBase {
public:
InstanceCountMixinBase();
virtual ~InstanceCountMixinBase();
// Override this in subclasses to provide a description of the instance.
// @note If you find that your tests are leaking objects, it can make your
// life easier to override this function in your test classes and invoke
// LogLeakedObjects to get a handle on the type and identity of the leaked
// objects.
virtual void GetDescription(std::string* description) const;
// Logs the description of every instance to the error log.
static void LogLeakedInstances();
// @return the count of all InstanceCountMixinBase-derived instances.
static size_t all_instance_count();
typedef std::set<InstanceCountMixinBase*> InstanceSet;
// @return the start enumerator over the existing instances.
// @note use of this enumerator is not thread safe.
static InstanceSet::const_iterator begin();
// @return the end enumerator over the existing instances.
// @note use of this enumerator is not thread safe.
static InstanceSet::const_iterator end();
protected:
static base::Lock lock_;
};
// Inherit test classes from this class to get a per-class instance count.
// Usage:
// class TestFoo: public InstanceCountMixin<TestFoo> {
// }
//
// EXPECT_EQ(0, TestFoo::instance_count());
template <class T>
class InstanceCountMixin : public InstanceCountMixinBase {
public:
InstanceCountMixin() {
base::AutoLock lock(lock_);
++instance_count_;
}
~InstanceCountMixin() {
base::AutoLock lock(lock_);
--instance_count_;
}
// @return the number of T instances.
static size_t instance_count() { return instance_count_; }
private:
static size_t instance_count_;
};
template <class T> size_t InstanceCountMixin<T>::instance_count_ = 0;
} // namespace testing
#endif // CEEE_TESTING_UTILS_INSTANCE_COUNT_MIXIN_H_
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