array.h revision d0a35e33b55535e8d8a328f245aa4f0c0c6d42c9
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * MS COM / XPCOM Abstraction Layer:
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Safe array helper class declaration
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Copyright (C) 2006-2007 Sun Microsystems, Inc.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * available from http://www.virtualbox.org. This file is free software;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * you can redistribute it and/or modify it under the terms of the GNU
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * General Public License (GPL) as published by the Free Software
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
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f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * The contents of this file may alternatively be used under the terms
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1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * additional information or have any questions.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync/** @defgroup grp_COM_arrays COM/XPCOM Arrays
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * The COM/XPCOM array support layer provides a cross-platform way to pass
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * arrays to and from COM interface methods and consists of the com::SafeArray
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * template and a set of ComSafeArray* macros part of which is defined in
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * This layer works with interface attributes and method parameters that have
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * the 'safearray="yes"' attribute in the XIDL definition:
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync <interface name="ISomething" ...>
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync <method name="testArrays">
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync <param name="inArr" type="long" dir="in" safearray="yes"/>
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync <param name="outArr" type="long" dir="out" safearray="yes"/>
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync <param name="retArr" type="long" dir="return" safearray="yes"/>
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync </interface>
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Methods generated from this and similar definitions are implemented in
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * component classes using the following declarations:
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync STDMETHOD(TestArrays) (ComSafeArrayIn (LONG, aIn),
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ComSafeArrayOut (LONG, aOut),
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ComSafeArrayOut (LONG, aRet));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * And the following function bodies:
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync STDMETHODIMP Component::TestArrays (ComSafeArrayIn (LONG, aIn),
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ComSafeArrayOut (LONG, aOut),
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ComSafeArrayOut (LONG, aRet))
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync if (ComSafeArrayInIsNull (aIn))
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync return E_INVALIDARG;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync if (ComSafeArrayOutIsNull (aOut))
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync return E_POINTER;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync if (ComSafeArrayOutIsNull (aRet))
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync return E_POINTER;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync // Use SafeArray to access the input array parameter
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync com::SafeArray <LONG> in (ComSafeArrayInArg (aIn));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync for (size_t i = 0; i < in.size(); ++ i)
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync LogFlow (("*** in[%u]=%d\n", i, in [i]));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync // Use SafeArray to create the return array (the same technique is used
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync // for output array paramters)
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync SafeArray <LONG> ret (in.size() * 2);
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync for (size_t i = 0; i < in.size(); ++ i)
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ret [i] = in [i];
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ret [i + in.size()] = in [i] * 10;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ret.detachTo (ComSafeArrayOutArg (aRet));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync return S_OK;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Such methods can be called from the client code using the following pattern:
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ComPtr <ISomething> component;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync com::SafeArray <LONG> in (3);
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync in [0] = -1;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync in [1] = -2;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync in [2] = -3;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync com::SafeArray <LONG> out;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync com::SafeArray <LONG> ret;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync HRESULT rc = component->TestArrays (ComSafeArrayAsInParam (in),
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ComSafeArrayAsOutParam (out),
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ComSafeArrayAsOutParam (ret));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync if (SUCCEEDED (rc))
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync for (size_t i = 0; i < ret.size(); ++ i)
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync printf ("*** ret[%u]=%d\n", i, ret [i]);
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * For interoperability with standard C++ containers, there is a template
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * constructor that takes such a container as argument and performs a deep copy
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * of its contents. This can be used in method implementations like this:
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync STDMETHODIMP Component::COMGETTER(Values) (ComSafeArrayOut (int, aValues))
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync // ... assume there is a |std::list <int> mValues| data member
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync com::SafeArray <int> values (mValues);
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync values.detachTo (ComSafeArrayOutArg (aValues));
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync return S_OK;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * The current implementation of the SafeArray layer supports all types normally
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * allowed in XIDL as array element types (including 'wstring' and 'uuid').
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * However, 'pointer-to-...' types (e.g. 'long *', 'wstring *') are not
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * supported and therefore cannot be used as element types.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Note that for GUID arrays you should use SafeGUIDArray and
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * SafeConstGUIDArray, customized SafeArray<> specializations.
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * Also note that in order to pass input BSTR array parameters declared
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * using the ComSafeArrayIn (INPTR BSTR, aParam) macro to the SafeArray<>
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * constructor using the ComSafeArrayInArg() macro, you should use INPTR BSTR
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * as the SafeArray<> template argument, not just BSTR.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Arrays of interface pointers are also supported but they require to use a
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * special SafeArray implementation, com::SafeIfacePointer, which takes the
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * interface class name as a template argument (e.g. com::SafeIfacePointer
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * <IUnknown>). This implementation functions identically to com::SafeArray.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Wraps the given com::SafeArray instance to generate an expression that is
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * suitable for passing it to functions that take input safearray parameters
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * declared using the ComSafeArrayIn macro.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @param aArray com::SafeArray instance to pass as an input parameter.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync (aArray).size(), (aArray).__asInParam_Arr ((aArray).raw())
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Wraps the given com::SafeArray instance to generate an expression that is
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * suitable for passing it to functions that take output safearray parameters
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * declared using the ComSafeArrayOut macro.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @param aArray com::SafeArray instance to pass as an output parameter.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync (aArray).__asOutParam_Size(), (aArray).__asOutParam_Arr()
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#else /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#define ComSafeArrayAsInParam(aArray) (aArray).__asInParam()
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#define ComSafeArrayAsOutParam(aArray) (aArray).__asOutParam()
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#endif /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync////////////////////////////////////////////////////////////////////////////////
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Provides various helpers for SafeArray.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * @param T Type of array elements.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /** Initializes memory for aElem. */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /** Initializes memory occupied by aElem. */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /** Creates a deep copy of aFrom and stores it in aTo. */
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync static void Copy (const T &aFrom, T &aTo) { aTo = aFrom; }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync /* Magic to workaround strict rules of par. 4.4.4 of the C++ standard (that
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * in particular forbid casts of 'char **' to 'const char **'). Then initial
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * reason for this magic is that XPIDL declares input strings
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * (char/PRUnichar pointers) as const but doesn't do so for pointers to
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * arrays. */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync static T *__asInParam_Arr (T *aArr) { return aArr; }
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync static T *__asInParam_Arr (const T *aArr) { return const_cast <T *> (aArr); }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync // Arbitrary pointers are not supported
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync static void Init (PRUnichar * &aElem) { aElem = NULL; }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync static void Copy (const PRUnichar * aFrom, PRUnichar * &aTo)
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync AssertCompile (sizeof (PRUnichar) == sizeof (OLECHAR));
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync aTo = aFrom ? ::SysAllocString ((const OLECHAR *) aFrom) : NULL;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync /* Magic to workaround strict rules of par. 4.4.4 of the C++ standard */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync static const PRUnichar **__asInParam_Arr (PRUnichar **aArr)
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync static const PRUnichar **__asInParam_Arr (const PRUnichar **aArr) { return aArr; }
66ea7017a123b8b854e76bbfd919a320815058b3vboxsync static void Init (const PRUnichar * &aElem) { aElem = NULL; }
66ea7017a123b8b854e76bbfd919a320815058b3vboxsync ::SysFreeString (const_cast <PRUnichar *> (aElem));
66ea7017a123b8b854e76bbfd919a320815058b3vboxsync static void Copy (const PRUnichar * aFrom, const PRUnichar * &aTo)
66ea7017a123b8b854e76bbfd919a320815058b3vboxsync AssertCompile (sizeof (PRUnichar) == sizeof (OLECHAR));
66ea7017a123b8b854e76bbfd919a320815058b3vboxsync aTo = aFrom ? ::SysAllocString ((const OLECHAR *) aFrom) : NULL;
66ea7017a123b8b854e76bbfd919a320815058b3vboxsync /* Magic to workaround strict rules of par. 4.4.4 of the C++ standard */
66ea7017a123b8b854e76bbfd919a320815058b3vboxsync static const PRUnichar **__asInParam_Arr (const PRUnichar **aArr) { return aArr; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /* This specification is also reused for SafeConstGUIDArray, so provide a
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * no-op Init() and Uninit() which are necessary for SafeArray<> but should
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * be never called in context of SafeConstGUIDArray. */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static void Init (const nsID * &aElem) { NOREF (aElem); AssertFailed(); }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static void Uninit (const nsID * &aElem) { NOREF (aElem); AssertFailed(); }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /** Magic to workaround strict rules of par. 4.4.4 of the C++ standard. */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static const nsID **__asInParam_Arr (const nsID **aArr) { return aArr; }
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#else /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync////////////////////////////////////////////////////////////////////////////////
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Provides various helpers for SafeArray.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * @param T Type of array elements.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Specializations of this template must provide the following methods:
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync // Returns the VARTYPE of COM SafeArray elements to be used for T
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static VARTYPE VarType();
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync // Returns the number of VarType() elements necessary for aSize
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync // elements of T
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static ULONG VarCount (size_t aSize);
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync // Returns the number of elements of T that fit into the given number of
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync // VarType() elements (opposite to VarCount (size_t aSize)).
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static size_t Size (ULONG aVarCount);
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync // Creates a deep copy of aFrom and stores it in aTo
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static void Copy (ULONG aFrom, ULONG &aTo);
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync // Arbitrary types are treated as passed by value and each value is
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync // represented by a number of VT_Ix type elements where VT_Ix has the
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync // biggest possible bitness necessary to represent T w/o a gap. COM enums
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync // fall into this category.
775825ebdd814b3074f25c98babd0c1236b59e5cvboxsync if (sizeof (T) % 8 == 0) return (ULONG) ((sizeof (T) / 8) * aSize);
775825ebdd814b3074f25c98babd0c1236b59e5cvboxsync if (sizeof (T) % 4 == 0) return (ULONG) ((sizeof (T) / 4) * aSize);
775825ebdd814b3074f25c98babd0c1236b59e5cvboxsync if (sizeof (T) % 2 == 0) return (ULONG) ((sizeof (T) / 2) * aSize);
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync if (sizeof (T) % 8 == 0) return (size_t) (aVarCount * 8) / sizeof (T);
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync if (sizeof (T) % 4 == 0) return (size_t) (aVarCount * 4) / sizeof (T);
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync if (sizeof (T) % 2 == 0) return (size_t) (aVarCount * 2) / sizeof (T);
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync static void Copy (T aFrom, T &aTo) { aTo = aFrom; }
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync // Arbitrary pointer types are not supported
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync/* Although the generic SafeArrayTraits template would work for all integers,
f13f1ed69a96abc07232826cd40e8b08ae66afeavboxsync * we specialize it for some of them in order to use the correct VT_ type */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static ULONG VarCount (size_t aSize) { return (ULONG) aSize; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static size_t Size (ULONG aVarCount) { return (size_t) aVarCount; }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync static void Copy (LONG aFrom, LONG &aTo) { aTo = aFrom; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static ULONG VarCount (size_t aSize) { return (ULONG) aSize; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static size_t Size (ULONG aVarCount) { return (size_t) aVarCount; }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync static void Copy (ULONG aFrom, ULONG &aTo) { aTo = aFrom; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static ULONG VarCount (size_t aSize) { return (ULONG) aSize; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static size_t Size (ULONG aVarCount) { return (size_t) aVarCount; }
a74cfe6f5b8ca6b317ff91593bcc5b113a78f54fvboxsync static void Copy (LONG64 aFrom, LONG64 &aTo) { aTo = aFrom; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static ULONG VarCount (size_t aSize) { return (ULONG) aSize; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static size_t Size (ULONG aVarCount) { return (size_t) aVarCount; }
a74cfe6f5b8ca6b317ff91593bcc5b113a78f54fvboxsync static void Copy (ULONG64 aFrom, ULONG64 &aTo) { aTo = aFrom; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static ULONG VarCount (size_t aSize) { return (ULONG) aSize; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static size_t Size (ULONG aVarCount) { return (size_t) aVarCount; }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync aTo = aFrom ? ::SysAllocString ((const OLECHAR *) aFrom) : NULL;
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /* Use the 64-bit unsigned integer type for GUID */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /* GUID is 128 bit, so we need two VT_UI8 */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static size_t Size (ULONG aVarCount) { return (size_t) aVarCount / 2; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static void Copy (GUID aFrom, GUID &aTo) { aTo = aFrom; }
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#endif /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync////////////////////////////////////////////////////////////////////////////////
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * The SafeArray class represents the safe array type used in COM to pass arrays
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * to/from interface methods.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * This helper class hides all MSCOM/XPCOM specific implementation details and,
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * together with ComSafeArrayIn, ComSafeArrayOut and ComSafeArrayRet macros,
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * provides a platform-neutral way to handle safe arrays in the method
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * implementation.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * When an instance of this class is destroyed, it automatically frees all
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * resources occupied by individual elements of the array as well as by the
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * array itself. However, when the value of an element is manually changed
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * using #operator[] or by accessing array data through the #raw() pointer, it is
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * the caller's responsibility to free resources occupied by the previous
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * element's value.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Also, objects of this class do not support copy and assignment operations and
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * therefore cannot be returned from functions by value. In other words, this
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * class is just a temporary storage for handling interface method calls and not
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * intended to be used to store arrays as data members and such -- you should
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * use normal list/vector classes for that.
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * @note The current implementation supports only one-dimensional arrays.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @note This class is not thread-safe.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsynctemplate <typename T, class Traits = SafeArrayTraits <T> >
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Creates a null array.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Creates a new array of the given size. All elements of the newly created
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * array initialized with null values.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @param aSize Initial number of elements in the array. Must be greater
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @note If this object remains null after construction it means that there
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * was not enough memory for creating an array of the requested size.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * The constructor will also assert in this case.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Weakly attaches this instance to the existing array passed in a method
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * parameter declared using the ComSafeArrayIn macro. When using this call,
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * always wrap the parameter name in the ComSafeArrayInArg macro call like
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * SafeArray safeArray (ComSafeArrayInArg (aArg));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Note that this constructor doesn't take the ownership of the array. In
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * particular, it means that operations that operate on the ownership (e.g.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * #detachTo()) are forbidden and will assert.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @param aArg Input method parameter to attach to.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#else /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync ("Expected vartype %d, got %d.\n",
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync AssertReturnVoid (m.arr == NULL || accessRaw() != NULL);
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#endif /* defined (VBOX_WITH_XPCOM) */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Creates a deep copy of the given standard C++ container.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param aCntr Container object to copy.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param C Standard C++ container template class (normally deduced from
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @c aCntr).
bb8a4aa0c1eab48899950a455a35bb517d4f2ea4vboxsync template <template <typename, typename> class C, class A>
cbfbca3cb03359ef81b43ee19993c2d2f54a2aeevboxsync for (typename C <T, A>::const_iterator it = aCntr.begin();
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Destroys this instance after calling #setNull() to release allocated
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * resources. See #setNull() for more details.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Returns @c true if this instance represents a null array.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Resets this instance to null and, if this instance is not a weak one,
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * releases any resources occupied by the array data.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @note This method destroys (cleans up) all elements of the array using
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * the corresponding cleanup routine for the element type before the
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * array itself is destroyed.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Returns @c true if this instance is weak. A weak instance doesn't own the
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * array data and therefore operations manipulating the ownership (e.g.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * #detachTo()) are forbidden and will assert.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync /** Number of elements in the array. */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Resizes the array preserving its contents when possible. If the new size
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * is bigger than the old size, new elements are initialized with null
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * values. If the new size is smaller than the old size, the contents of the
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * array above the new size is lost.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @param aNewSize New number of elements in the array.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @return @c true on success and false if there is not enough
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * memory for resizing.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync /// @todo Implement me!
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Reinitializes this instance by preallocating space for the given number
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * of elements. The previous array contents is lost.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @param aNewSize New number of elements in the array.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @return @c true on success and false if there is not enough
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * memory for resizing.
fc0e356b72ae84be35c7aafc9323710c935686c1vboxsync /* Note: for zero-sized arrays, we use the size of 1 because whether
fc0e356b72ae84be35c7aafc9323710c935686c1vboxsync * malloc(0) returns a null pointer or not (which is used in isNull())
fc0e356b72ae84be35c7aafc9323710c935686c1vboxsync * is implementation-dependent according to the C standard. */
fc0e356b72ae84be35c7aafc9323710c935686c1vboxsync m.arr = (T *) nsMemory::Alloc (RT_MAX (aNewSize, 1) * sizeof (T));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync return true;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Returns a pointer to the raw array data. Use this raw pointer with care
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * as no type or bound checking is done for you in this case.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @note This method returns @c NULL when this instance is null.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @see #operator[]
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Const version of #raw().
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync const T *raw() const
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Array access operator that returns an array element by reference. A bit
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * safer than #raw(): asserts and returns an invalid reference if this
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * instance is null or if the index is out of bounds.
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * @note For weak instances, this call will succeed but the behavior of
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * changing the contents of an element of the weak array instance is
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * undefined and may lead to a program crash on some platforms.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Const version of #operator[] that returns an array element by value.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync AssertReturn (unconst (this)->accessRaw() != NULL, *((T *) NULL));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * Creates a copy of this array and stores it in a method parameter declared
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * using the ComSafeArrayOut macro. When using this call, always wrap the
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * parameter name in the ComSafeArrayOutArg macro call like this:
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * safeArray.cloneTo (ComSafeArrayOutArg (aArg));
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @note It is assumed that the ownership of the returned copy is
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * transferred to the caller of the method and he is responsible to free the
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * array data when it is no more necessary.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @param aArg Output method parameter to clone to.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync virtual const SafeArray &cloneTo (ComSafeArrayOut (T, aArg)) const
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync /// @todo Implement me!
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Transfers the ownership of this array's data to the specified location
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * declared using the ComSafeArrayOut macro and makes this array a null
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * array. When using this call, always wrap the parameter name in the
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * ComSafeArrayOutArg macro call like this:
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * safeArray.detachTo (ComSafeArrayOutArg (aArg));
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Detaching the null array is also possible in which case the location will
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * receive NULL.
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * @note Since the ownership of the array data is transferred to the
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * caller of the method, he is responsible to free the array data when it is
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync * no more necessary.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * @param aArg Location to detach to.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync virtual SafeArray &detachTo (ComSafeArrayOut (T, aArg))
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#else /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#endif /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync // public methods for internal purposes only
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync /** Internal function. Never call it directly. */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync PRUint32 *__asOutParam_Size() { setNull(); return &m.size; }
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync /** Internal function Never call it directly. */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync T **__asOutParam_Arr() { Assert (isNull()); return &m.arr; }
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#else /* defined (VBOX_WITH_XPCOM) */
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync /** Internal function Never call it directly. */
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync /** Internal function Never call it directly. */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync SAFEARRAY ** __asOutParam() { setNull(); return &m.arr; }
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#endif /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#else /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync /** Requests access to the raw data pointer. */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync HRESULT rc = SafeArrayAccessData (m.arr, (void HUGEP **) &m.raw);
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#endif /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#else /* defined (VBOX_WITH_XPCOM) */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#endif /* defined (VBOX_WITH_XPCOM) */
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync////////////////////////////////////////////////////////////////////////////////
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Version of com::SafeArray for arrays of GUID.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * In MS COM, GUID arrays store GUIDs by value and therefore input arrays are
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * represented using |GUID *| and out arrays -- using |GUID **|. In XPCOM,
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * GUID arrays store pointers to nsID so that input arrays are |const nsID **|
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * and out arrays are |nsID ***|. Due to this difference, it is impossible to
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * work with arrays of GUID on both platforms by simply using com::SafeArray
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * <GUID>. This class is intended to provide some level of cross-platform
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * behavior.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * The basic usage pattern is basically similar to com::SafeArray<> except that
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * you use ComSafeGUIDArrayIn* and ComSafeGUIDArrayOut* macros instead of
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * ComSafeArrayIn* and ComSafeArrayOut*. Another important nuance is that the
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * raw() array type is different (nsID **, or GUID ** on XPCOM and GUID * on MS
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * COM) so it is recommended to use operator[] instead that always returns a
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * GUID by value.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Note that due to const modifiers, you cannot use SafeGUIDArray for input GUID
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * arrays. Please use SafeConstGUIDArray for this instead.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Other than mentioned above, the functionality of this class is equivalent to
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * com::SafeArray<>. See the description of that template and its methods for
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * more information.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Output GUID arrays are handled by a separate class, SafeGUIDArrayOut, since
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * this class cannot handle them because of const modifiers.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync operator const nsID &() const { return mVal ? *mVal : *Empty; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync operator nsID() const { return mVal ? *mVal : *Empty; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync const nsID *operator&() const { return mVal ? mVal : Empty; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /** See SafeArray<>::SafeArray(). */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /** See SafeArray<>::SafeArray (size_t). */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Array access operator that returns an array element by reference. As a
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * special case, the return value of this operator on XPCOM is a nsID (GUID)
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * reference, instead of a nsID pointer (the actual SafeArray template
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * argument), for compatibility with the MS COM version.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * The rest is equivalent to SafeArray<>::operator[].
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Const version of #operator[] that returns an array element by value.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync return m.arr [aIdx] ? *m.arr [aIdx] : *nsIDRef::Empty;
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Version of com::SafeArray for const arrays of GUID.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * This class is used to work with input GUID array parameters in method
dbea238999d6a4b34b9d1bdd1292e29717dd14bevboxsync * implementations. See SafeGUIDArray for more details.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsyncclass SafeConstGUIDArray : public SafeArray <const nsID *,
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync typedef SafeArray <const nsID *, SafeArrayTraits <nsID *> > Base;
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /** See SafeArray<>::SafeArray(). */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /* See SafeArray<>::SafeArray (ComSafeArrayIn (T, aArg)). */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * Array access operator that returns an array element by reference. As a
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * special case, the return value of this operator on XPCOM is nsID (GUID)
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * instead of nsID *, for compatibility with the MS COM version.
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync * The rest is equivalent to SafeArray<>::operator[].
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync AssertReturn (m.arr != NULL, **((const nsID * *) NULL));
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync AssertReturn (aIdx < size(), **((const nsID * *) NULL));
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync /* These are disabled because of const */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync bool reset (size_t aNewSize) { NOREF (aNewSize); return false; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync#else /* defined (VBOX_WITH_XPCOM) */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsynctypedef SafeArray <const GUID, SafeArrayTraits <GUID> > SafeConstGUIDArray;
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync#endif /* defined (VBOX_WITH_XPCOM) */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync////////////////////////////////////////////////////////////////////////////////
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync /* Magic to workaround strict rules of par. 4.4.4 of the C++ standard. */
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync static I **__asInParam_Arr (I **aArr) { return aArr; }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync static I **__asInParam_Arr (const I **aArr) { return const_cast <I **> (aArr); }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync#else /* defined (VBOX_WITH_XPCOM) */
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static ULONG VarCount (size_t aSize) { return (ULONG) aSize; }
dcea3eadf1ecc8f4ac868185a05a63be42a199e4vboxsync static size_t Size (ULONG aVarCount) { return (size_t) aVarCount; }
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync#endif /* defined (VBOX_WITH_XPCOM) */
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync////////////////////////////////////////////////////////////////////////////////
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Version of com::SafeArray for arrays of interface pointers.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Except that it manages arrays of interface pointers, the usage of this class
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * is identical to com::SafeArray.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param I Interface class (no asterisk).
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsyncclass SafeIfaceArray : public SafeArray <I *, SafeIfaceArrayTraits <I> >
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync typedef SafeArray <I *, SafeIfaceArrayTraits <I> > Base;
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Creates a null array.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Creates a new array of the given size. All elements of the newly created
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * array initialized with null values.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param aSize Initial number of elements in the array. Must be greater
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @note If this object remains null after construction it means that there
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * was not enough memory for creating an array of the requested size.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * The constructor will also assert in this case.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Weakly attaches this instance to the existing array passed in a method
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * parameter declared using the ComSafeArrayIn macro. When using this call,
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * always wrap the parameter name in the ComSafeArrayOutArg macro call like
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * SafeArray safeArray (ComSafeArrayInArg (aArg));
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Note that this constructor doesn't take the ownership of the array. In
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * particular, it means that operations that operate on the ownership (e.g.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * #detachTo()) are forbidden and will assert.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param aArg Input method parameter to attach to.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync#else /* defined (VBOX_WITH_XPCOM) */
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync ("Expected vartype VT_UNKNOWN, got %d.\n",
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync AssertMsgReturnVoid (InlineIsEqualGUID (_ATL_IIDOF (I), guid),
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync ("Expected IID {%Vuuid}, got {%Vuuid}.\n",
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync#endif /* defined (VBOX_WITH_XPCOM) */
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Creates a deep copy of the given standard C++ container that stores
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * interface pointers as objects of the ComPtr <I> class.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param aCntr Container object to copy.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param C Standard C++ container template class (normally deduced from
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @c aCntr).
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param A Standard C++ allocator class (deduced from @c aCntr).
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param OI Argument to the ComPtr template (deduced from @c aCntr).
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync template <template <typename, typename> class C, class A, class OI>
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync for (typename List::const_iterator it = aCntr.begin();
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Creates a deep copy of the given standard C++ container that stores
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * interface pointers as objects of the ComObjPtr <I> class.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param aCntr Container object to copy.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param C Standard C++ container template class (normally deduced from
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @c aCntr).
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param A Standard C++ allocator class (deduced from @c aCntr).
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param OI Argument to the ComObjPtr template (deduced from @c aCntr).
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync template <template <typename, typename> class C, class A, class OI>
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync SafeIfaceArray (const C <ComObjPtr <OI>, A> & aCntr)
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync for (typename List::const_iterator it = aCntr.begin();
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * Reinitializes this instance by preallocating space for the given number
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * of elements. The previous array contents is lost.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @param aNewSize New number of elements in the array.
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * @return @c true on success and false if there is not enough
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync * memory for resizing.
fc0e356b72ae84be35c7aafc9323710c935686c1vboxsync /* Note: for zero-sized arrays, we use the size of 1 because whether
fc0e356b72ae84be35c7aafc9323710c935686c1vboxsync * malloc(0) returns a null pointer or not (which is used in isNull())
fc0e356b72ae84be35c7aafc9323710c935686c1vboxsync * is implementation-dependent according to the C standard. */
fc0e356b72ae84be35c7aafc9323710c935686c1vboxsync Base::m.arr = (I **) nsMemory::Alloc (RT_MAX (aNewSize, 1) * sizeof (I *));
7a18d4bae4d9ff1216be13970ae7815604b3365bvboxsync return true;
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync} /* namespace com */
f9108665f82b59c99ac444815d75af51a14e46c7vboxsync#endif /* ___VBox_com_array_h */