| /* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
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| * ***** BEGIN LICENSE BLOCK ***** |
| * Version: MPL 1.1/GPL 2.0/LGPL 2.1 |
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| * The Initial Developer of the Original Code is |
| * Netscape Communications, Inc. |
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| * |
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| * ***** END LICENSE BLOCK ***** */ |
| |
| #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 ) |
| { |
| NS_PRECONDITION(aSource, "null parameter"); |
| NS_PRECONDITION(aDestination, "null parameter"); |
| |
| return aSource->GetInterface(NS_GET_TEMPLATE_IID(DestinationType), |
| reinterpret_cast<void**>(aDestination)); |
| } |
| |
| class NS_COM_GLUE nsGetInterface : public nsCOMPtr_helper |
| { |
| public: |
| nsGetInterface( nsISupports* aSource, nsresult* error ) |
| : mSource(aSource), |
| mErrorPtr(error) |
| { |
| // nothing else to do here |
| } |
| |
| virtual nsresult NS_FASTCALL operator()( const nsIID&, void** ) const; |
| |
| private: |
| nsISupports* mSource; |
| nsresult* mErrorPtr; |
| }; |
| |
| inline |
| const nsGetInterface |
| do_GetInterface( nsISupports* aSource, nsresult* error = 0 ) |
| { |
| return nsGetInterface(aSource, error); |
| } |
| |
| #endif // __nsInterfaceRequestorUtils_h |
| |