serge-sans-paille
fac0f5e1a8
Differential Revision: https://phabricator.services.mozilla.com/D301767
39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
/* 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/. */
|
|
|
|
#ifndef _nsInterfaceRequestorUtils_h
|
|
#define _nsInterfaceRequestorUtils_h
|
|
|
|
#include "nsCOMPtr.h"
|
|
|
|
// a type-safe shortcut for calling the |GetInterface()| member function
|
|
// T must inherit from nsIInterfaceRequestor, but the cast may be ambiguous.
|
|
template <class T, class DestinationType>
|
|
inline nsresult CallGetInterface(T* aSource, DestinationType** aDestination) {
|
|
MOZ_ASSERT(aSource, "null parameter");
|
|
MOZ_ASSERT(aDestination, "null parameter");
|
|
|
|
return aSource->GetInterface(NS_GET_IID(DestinationType),
|
|
reinterpret_cast<void**>(aDestination));
|
|
}
|
|
|
|
class MOZ_STACK_CLASS nsGetInterface final : public nsCOMPtr_helper {
|
|
public:
|
|
nsGetInterface(nsISupports* aSource, nsresult* aError)
|
|
: mSource(aSource), mErrorPtr(aError) {}
|
|
|
|
virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override;
|
|
|
|
private:
|
|
nsISupports* MOZ_NON_OWNING_REF mSource;
|
|
nsresult* mErrorPtr;
|
|
};
|
|
|
|
inline const nsGetInterface do_GetInterface(nsISupports* aSource,
|
|
nsresult* aError = nullptr) {
|
|
return nsGetInterface(aSource, aError);
|
|
}
|
|
|
|
#endif // _nsInterfaceRequestorUtils_h
|