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Bug 1299515 - Make const nsMainThreadPtrHandle<T> usable. r=erahm

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This enables having a const nsMainThreadPtrHandle<T> member which we want to
ensure doesn't get assigned to, but whose (the `T`'s) non-const methods are
still usable on main thread. Similar to how RefPtr<T> works.

MozReview-Commit-ID: 8CG0MwIZmLc

--HG--
extra : rebase_source : f0e897d3bf4f9a4d752e964ef63de73a9e710752
This commit is contained in:
Andreas Pehrson 2017-11-22 11:24:18 +01:00
parent 99ea5bdb99
commit f12e78691b
1 changed files with 3 additions and 10 deletions
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13
xpcom/threads/nsProxyRelease.h
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@ -370,14 +370,7 @@ public:
// These all call through to nsMainThreadPtrHolder, and thus implicitly
// assert that we're on the main thread. Off-main-thread consumers must treat
// these handles as opaque.
T* get()
{
if (mPtr) {
return mPtr.get()->get();
}
return nullptr;
}
const T* get() const
T* get() const
{
if (mPtr) {
return mPtr.get()->get();
@ -385,8 +378,8 @@ public:
return nullptr;
}
operator T*() { return get(); }
T* operator->() MOZ_NO_ADDREF_RELEASE_ON_RETURN { return get(); }
operator T*() const { return get(); }
T* operator->() const MOZ_NO_ADDREF_RELEASE_ON_RETURN { return get(); }
// These are safe to call on other threads with appropriate external locking.
bool operator==(const nsMainThreadPtrHandle<T>& aOther) const