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base / observer_list_nocompile.nc [blame]
// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This is a "No Compile Test" suite.
// http://dev.chromium.org/developers/testing/no-compile-tests
#include "base/observer_list.h"
#include <memory>
#include <string>
#include <type_traits>
namespace base {
void CannotUseCheckedObserverInUncheckedList() {
struct Observer : public CheckedObserver {
void OnObserve() {}
};
ObserverList<Observer>::Unchecked list;
for (auto& observer : list) // expected-error@base/observer_list_internal.h:* {{CheckedObserver classes must not use ObserverList<T>::Unchecked}}
observer.OnObserve();
}
void CannotUseUncheckedObserverInCheckedList() {
struct UncheckedObserver {
void OnObserve() {}
};
ObserverList<UncheckedObserver> list;
for (auto& observer : list) // expected-error@base/observer_list_internal.h:* {{Observers should inherit from base::CheckedObserver.}}
observer.OnObserve(); // expected-error@*:* {{static_cast from 'base::CheckedObserver *' to 'UncheckedObserver *', which are not related by inheritance, is not allowed}}
}
// This test ensures that passing move-only types to ObserverList::Notify()
// fails compilation.
void NotifyWithMoveOnlyArgsFails() {
// std::unique_ptr is move-only.
auto str = std::make_unique<std::string>("123");
struct TestObserverWithArgs : public CheckedObserver {
void Observe(int, std::unique_ptr<std::string>) {}
};
ObserverList<TestObserverWithArgs> list;
// expected-error@* {{no matching member function for call to 'Notify'}}
list.Notify(&TestObserverWithArgs::Observe, 10, str);
// expected-error@* {{no matching member function for call to 'Notify'}}
list.Notify(&TestObserverWithArgs::Observe, 10, std::move(str));
}
} // namespace base