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Bug 1245979 - make mfbt Function reference-counted so that it can be cheaply copied for compatibility with Skia. r=froydnj

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This commit is contained in:
Lee Salzman 2016-02-04 16:43:42 -05:00
parent b1ed8d2fbf
commit b607eb03af
1 changed files with 29 additions and 5 deletions
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34
mfbt/Function.h
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@ -11,7 +11,8 @@
#include "mozilla/Attributes.h" // for MOZ_IMPLICIT
#include "mozilla/Move.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/RefCounted.h"
#include "mozilla/RefPtr.h"
// |Function<Signature>| is a wrapper that can hold any type of callable
// object that can be invoked in a way that's compatible with |Signature|.
@ -40,9 +41,11 @@ namespace mozilla {
namespace detail {
template<typename ReturnType, typename... Arguments>
class FunctionImplBase
class FunctionImplBase : public mozilla::RefCounted<FunctionImplBase<ReturnType, Arguments...>>
{
public:
MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(FunctionImplBase)
virtual ~FunctionImplBase() {}
virtual ReturnType call(Arguments... aArguments) = 0;
};
@ -137,7 +140,12 @@ public:
// This constructor is implicit to match the interface of |std::function|.
template <typename Callable>
MOZ_IMPLICIT Function(const Callable& aCallable)
: mImpl(MakeUnique<detail::FunctionImpl<Callable, ReturnType, Arguments...>>(aCallable))
: mImpl(new detail::FunctionImpl<Callable, ReturnType, Arguments...>(aCallable))
{}
MOZ_IMPLICIT Function(const Function& aFunction)
: mImpl(aFunction.mImpl)
{}
MOZ_IMPLICIT Function(decltype(nullptr))
{}
// Move constructor and move assingment operator.
@ -151,7 +159,17 @@ public:
template <typename Callable>
Function& operator=(const Callable& aCallable)
{
mImpl = MakeUnique<detail::FunctionImpl<Callable, ReturnType, Arguments...>>(aCallable);
mImpl = new detail::FunctionImpl<Callable, ReturnType, Arguments...>(aCallable);
return *this;
}
Function& operator=(const Function& aFunction)
{
mImpl = aFunction.mImpl;
return *this;
}
Function& operator=(decltype(nullptr))
{
mImpl = nullptr;
return *this;
}
@ -161,9 +179,15 @@ public:
MOZ_ASSERT(mImpl);
return mImpl->call(Forward<Args>(aArguments)...);
}
explicit operator bool() const
{
return bool(mImpl);
}
private:
// TODO: Consider implementing a small object optimization.
UniquePtr<detail::FunctionImplBase<ReturnType, Arguments...>> mImpl;
RefPtr<detail::FunctionImplBase<ReturnType, Arguments...>> mImpl;
};
} // namespace mozilla