gecko-dev/mfbt/tests/TestRefPtr.cpp
Nathan Froyd db188ea282 Bug 1160485 - remove implicit conversion from RefPtr<T> to TemporaryRef<T>; r=ehsan
Having this implicit conversion means that we can silently do extra
refcounting when it's completely unnecessary.  It's also an obstacle to
making RefPtr more nsRefPtr-like, so let's get rid of it.
2015-05-01 09:14:16 -04:00

164 lines
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/RefPtr.h"
using mozilla::RefCounted;
using mozilla::RefPtr;
using mozilla::TemporaryRef;
class Foo : public RefCounted<Foo>
{
public:
MOZ_DECLARE_REFCOUNTED_TYPENAME(Foo)
Foo() : mDead(false) {}
static int sNumDestroyed;
~Foo()
{
MOZ_ASSERT(!mDead);
mDead = true;
sNumDestroyed++;
}
private:
bool mDead;
};
int Foo::sNumDestroyed;
struct Bar : public Foo {};
TemporaryRef<Foo>
NewFoo()
{
RefPtr<Foo> f(new Foo());
return f.forget();
}
TemporaryRef<Foo>
NewBar()
{
RefPtr<Bar> bar = new Bar();
return bar.forget();
}
void
GetNewFoo(Foo** aFoo)
{
*aFoo = new Bar();
// Kids, don't try this at home
(*aFoo)->AddRef();
}
void
GetPassedFoo(Foo** aFoo)
{
// Kids, don't try this at home
(*aFoo)->AddRef();
}
void
GetNewFoo(RefPtr<Foo>* aFoo)
{
*aFoo = new Bar();
}
void
GetPassedFoo(RefPtr<Foo>* aFoo)
{}
TemporaryRef<Foo>
GetNullFoo()
{
return 0;
}
int
main()
{
MOZ_RELEASE_ASSERT(0 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = new Foo();
MOZ_RELEASE_ASSERT(f->refCount() == 1);
}
MOZ_RELEASE_ASSERT(1 == Foo::sNumDestroyed);
{
RefPtr<Foo> f1 = NewFoo();
RefPtr<Foo> f2(NewFoo());
MOZ_RELEASE_ASSERT(1 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(3 == Foo::sNumDestroyed);
{
RefPtr<Foo> b = NewBar();
MOZ_RELEASE_ASSERT(3 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(4 == Foo::sNumDestroyed);
{
RefPtr<Foo> f1;
{
f1 = new Foo();
RefPtr<Foo> f2(f1);
RefPtr<Foo> f3 = f2;
MOZ_RELEASE_ASSERT(4 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(4 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(5 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = new Foo();
f.forget();
MOZ_RELEASE_ASSERT(6 == Foo::sNumDestroyed);
}
{
RefPtr<Foo> f = new Foo();
GetNewFoo(byRef(f));
MOZ_RELEASE_ASSERT(7 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(8 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = new Foo();
GetPassedFoo(byRef(f));
MOZ_RELEASE_ASSERT(8 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(9 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = new Foo();
GetNewFoo(&f);
MOZ_RELEASE_ASSERT(10 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(11 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = new Foo();
GetPassedFoo(&f);
MOZ_RELEASE_ASSERT(11 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(12 == Foo::sNumDestroyed);
{
RefPtr<Foo> f1 = new Bar();
}
MOZ_RELEASE_ASSERT(13 == Foo::sNumDestroyed);
{
RefPtr<Foo> f = GetNullFoo();
MOZ_RELEASE_ASSERT(13 == Foo::sNumDestroyed);
}
MOZ_RELEASE_ASSERT(13 == Foo::sNumDestroyed);
return 0;
}