gecko-dev/xpcom/glue/nsIInterfaceRequestorUtils.cpp

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#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"

nsresult
nsGetInterface::operator()( const nsIID& aIID, void** aInstancePtr ) const
{
	nsresult status;

	if ( mSource )
		{
			nsCOMPtr<nsIInterfaceRequestor> factoryPtr = do_QueryInterface(mSource, &status);
			NS_ASSERTION(factoryPtr, "Did you know you were calling |do_GetInterface()| on an object that doesn't support the |nsIInterfaceRequestor| interface?");

			if ( factoryPtr )
				status = factoryPtr->GetInterface(aIID, aInstancePtr);

			if ( NS_FAILED(status) )
				*aInstancePtr = 0;
		}
	else
		status = NS_ERROR_NULL_POINTER;

	if ( mErrorPtr )
		*mErrorPtr = status;
	return status;
}