VirtualBoxBase.h revision e64031e20c39650a7bc902a3e1aba613b9415dee
2N/A * VirtualBox COM base classes definition 2N/A * Copyright (C) 2006-2010 Oracle Corporation 2N/A * This file is part of VirtualBox Open Source Edition (OSE), as 2N/A * you can redistribute it and/or modify it under the terms of the GNU 2N/A * General Public License (GPL) as published by the Free Software 2N/A * Foundation, in version 2 as it comes in the "COPYING" file of the 2N/A * VirtualBox OSE distribution. VirtualBox OSE is distributed in the 2N/A * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. // only declare the classes //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// /* use a special version of the singleton class factory, * see KB811591 in msdn for more info. */ // Aggregation is not supported in singleton objects. // Fix: The following If statement was moved inside the __try statement. // Did another thread arrive here first? // lock the module to indicate activity // (necessary for the monitor shutdown thread to correctly // terminate the module in case when CreateInstance() fails) #
endif /* !defined (VBOX_WITH_XPCOM) *///////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// * Special version of the Assert macro to be used within VirtualBoxBase * subclasses that also inherit the VirtualBoxSupportErrorInfoImpl template. * In the debug build, this macro is equivalent to Assert. * In the release build, this macro uses |setError(E_FAIL, ...)| to set the * error info from the asserted expression. * @see VirtualBoxSupportErrorInfoImpl::setError * @param expr Expression which should be true. "Please contact the product vendor!", \
* Special version of the AssertMsg macro to be used within VirtualBoxBase * subclasses that also inherit the VirtualBoxSupportErrorInfoImpl template. * See ComAssert for more info. * @param expr Expression which should be true. * @param a printf argument list (in parenthesis). "Please contact the product vendor!", \
* Special version of the AssertRC macro to be used within VirtualBoxBase * subclasses that also inherit the VirtualBoxSupportErrorInfoImpl template. * See ComAssert for more info. * @param vrc VBox status code. * Special version of the AssertMsgRC macro to be used within VirtualBoxBase * subclasses that also inherit the VirtualBoxSupportErrorInfoImpl template. * See ComAssert for more info. * @param vrc VBox status code. * @param msg printf argument list (in parenthesis). * Special version of the AssertComRC macro to be used within VirtualBoxBase * subclasses that also inherit the VirtualBoxSupportErrorInfoImpl template. * See ComAssert for more info. * @param rc COM result code /** Special version of ComAssert that returns ret if expr fails */ /** Special version of ComAssertMsg that returns ret if expr fails */ /** Special version of ComAssertRC that returns ret if vrc does not succeed */ /** Special version of ComAssertMsgRC that returns ret if vrc does not succeed */ /** Special version of ComAssertFailed that returns ret */ /** Special version of ComAssertMsgFailed that returns ret */ /** Special version of ComAssertComRC that returns ret if rc does not succeed */ /** Special version of ComAssertComRC that returns rc if rc does not succeed */ /** Special version of ComAssert that evaluates eval and breaks if expr fails */ /** Special version of ComAssertMsg that evaluates eval and breaks if expr fails */ /** Special version of ComAssertRC that evaluates eval and breaks if vrc does not succeed */ /** Special version of ComAssertMsgRC that evaluates eval and breaks if vrc does not succeed */ /** Special version of ComAssertFailed that evaluates eval and breaks */ /** Special version of ComAssertMsgFailed that evaluates eval and breaks */ /** Special version of ComAssertComRC that evaluates eval and breaks if rc does not succeed */ /** Special version of ComAssertComRC that just breaks if rc does not succeed */ /** Special version of ComAssert that evaluates eval and throws it if expr fails */ /** Special version of ComAssertMsg that evaluates eval and throws it if expr fails */ /** Special version of ComAssertRC that evaluates eval and throws it if vrc does not succeed */ /** Special version of ComAssertMsgRC that evaluates eval and throws it if vrc does not succeed */ /** Special version of ComAssertFailed that evaluates eval and throws it */ /** Special version of ComAssertMsgFailed that evaluates eval and throws it */ /** Special version of ComAssertComRC that evaluates eval and throws it if rc does not succeed */ /** Special version of ComAssertComRC that just throws rc if rc does not succeed */ //////////////////////////////////////////////////////////////////////////////// * Checks that the pointer argument is not NULL and returns E_INVALIDARG + * extended error info on failure. * @param arg Input pointer-type argument (strings, interface pointers...) * Checks that safe array argument is not NULL and returns E_INVALIDARG + * extended error info on failure. * @param arg Input safe array argument (strings, interface pointers...) * Checks that the string argument is not a NULL or empty string and returns * E_INVALIDARG + extended error info on failure. * @param arg Input string argument (BSTR etc.). tr(
"Argument %s is empty or NULL"), #
arg); \
* Checks that the given expression (that must involve the argument) is true and * returns E_INVALIDARG + extended error info on failure. * @param expr Expression to evaluate. tr(
"Argument %s is invalid (must be %s)"), #
arg, #
expr); \
* Checks that the given expression (that must involve the argument) is true and * returns E_INVALIDARG + extended error info on failure. The error message must * @param expr Expression to evaluate. * @param msg Parenthesized printf-like expression (must start with a verb, * like "must be one of...", "is not within..."). * Checks that the given pointer to an output argument is valid and returns * E_POINTER + extended error info otherwise. * @param arg Pointer argument. tr(
"Output argument %s points to invalid memory location (%p)"), \
* Checks that the given pointer to an output safe array argument is valid and * returns E_POINTER + extended error info otherwise. * @param arg Safe array argument. tr(
"Output argument %s points to invalid memory location (%p)"), \
* Sets the extended error info and returns E_NOTIMPL. * Declares an empty constructor and destructor for the given class. * This is useful to prevent the compiler from generating the default * ctor and dtor, which in turn allows to use forward class statements * (instead of including their header files) when declaring data members of * non-fundamental types with constructors (which are always called implicitly * by constructors and by the destructor of the class). * This macro is to be placed within (the public section of) the class * declaration. Its counterpart, DEFINE_EMPTY_CTOR_DTOR, must be placed * somewhere in one of the translation units (usually .cpp source files). * @param cls class to declare a ctor and dtor for * Defines an empty constructor and destructor for the given class. * See DECLARE_EMPTY_CTOR_DTOR for more info. //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// * This enum is used in the virtual method VirtualBoxBasePro::getClassID() to * allow VirtualBox classes to identify themselves. Subclasses can override * that method and return a value from this enum if run-time identification is * Abstract base class for all component classes implementing COM * interfaces of the VirtualBox COM library. * Declares functionality that should be available in all components. * Note that this class is always subclassed using the virtual keyword so * that only one instance of its VTBL and data is present in each derived class * even in case if VirtualBoxBaseProto appears more than once among base classes * of the particular component as a result of multiple inheritance. * This makes it possible to have intermediate base classes used by several * components that implement some common interface functionality but still let * the final component classes choose what VirtualBoxBase variant it wants to * Among the basic functionality implemented by this class is the primary object * state that indicates if the object is ready to serve the calls, and if not, * what stage it is currently at. Here is the primary state diagram: * +-------------------------------------------------------+ * | (InitFailed) -----------------------+ | * [*] ---> NotReady ----> (InInit) -----> Ready -----> (InUninit) ----+ * The object is fully operational only when its state is Ready. The Limited * state means that only some vital part of the object is operational, and it * requires some sort of reinitialization to become fully operational. The * NotReady state means the object is basically dead: it either was not yet * initialized after creation at all, or was uninitialized and is waiting to be * destroyed when the last reference to it is released. All other states are * The NotReady->InInit->Ready, NotReady->InInit->Limited and * NotReady->InInit->InitFailed transition is done by the AutoInitSpan smart * The Limited->InInit->Ready, Limited->InInit->Limited and * Limited->InInit->InitFailed transition is done by the AutoReinitSpan smart * The Ready->InUninit->NotReady and InitFailed->InUninit->NotReady * transitions are done by the AutoUninitSpan smart class. * In order to maintain the primary state integrity and declared functionality * 1) Use the above Auto*Span classes to perform state transitions. See the * individual class descriptions for details. * 2) All public methods of subclasses (i.e. all methods that can be called * directly, not only from within other methods of the subclass) must have a * standard prolog as described in the AutoCaller and AutoLimitedCaller * documentation. Alternatively, they must use addCaller()/releaseCaller() * directly (and therefore have both the prolog and the epilog), but this is * Unintialization method. * Must be called by all final implementations (component classes) when the * last reference to the object is released, before calling the destructor. * This method is also automatically called by the uninit() method of this * object's parent if this object is a dependent child of a class derived * from VirtualBoxBaseWithChildren (see * VirtualBoxBaseWithChildren::addDependentChild). * @note Never call this method the AutoCaller scope or after the * #addCaller() call not paired by #releaseCaller() because it is a * guaranteed deadlock. See AutoUninitSpan for details. * Adds a limited caller. This method is equivalent to doing * <tt>addCaller (aState, true)</tt>, but it is preferred because provides * better self-descriptiveness. See #addCaller() for more info. * Simple run-time type identification without having to enable C++ RTTI. * Override of the default locking class to be used for validating lock * order with the standard member lock handle. * Returns a lock handle used to protect the primary state fields (used by * #addCaller(), AutoInitSpan, AutoUninitSpan, etc.). Only intended to be * used for similar purposes in subclasses. WARNING: NO any other locks may * be requested while holding this lock! /** Primary state of this object */ /** Thread that caused the last state change */ /** Total number of active calls to this object */ /** Posted when the number of callers drops to zero */ /** Posted when the object goes from InInit/InUninit to some other state */ /** Number of threads waiting for mInitUninitDoneSem */ /** Protects access to state related data members */ /** User-level object lock for subclasses */ //////////////////////////////////////////////////////////////////////////////// // VirtualBoxSupportTranslation, VirtualBoxSupportErrorInfoImpl //////////////////////////////////////////////////////////////////////////////// * This macro adds the error info support to methods of the VirtualBoxBase * class (by overriding them). Place it to the public section of the * VirtualBoxBase subclass and the following methods will set the extended * error info in case of failure instead of just returning the result code: * <li>VirtualBoxBase::addCaller() * @note The given VirtualBoxBase subclass must also inherit from both * VirtualBoxSupportErrorInfoImpl and VirtualBoxSupportTranslation templates! * @param C VirtualBoxBase subclass to add the error info support to //////////////////////////////////////////////////////////////////////////////// /** Helper for VirtualBoxSupportTranslation. */ * The VirtualBoxSupportTranslation template implements the NLS string * translation support for the given class. * Translation support is provided by the static #tr() function. This function, * given a string in UTF-8 encoding, looks up for a translation of the given * string by calling the VirtualBoxBase::translate() global function which * receives the name of the enclosing class ("context of translation") as the * additional argument and returns a translated string based on the currently * @param C Class that needs to support the string translation. * @note Every class that wants to use the #tr() function in its own methods * must inherit from this template, regardless of whether its base class * (if any) inherits from it or not. Otherwise, the translation service * will not work correctly. However, the declaration of the derived * the <tt>COM_SUPPORTTRANSLATION_OVERRIDE (<ClassName>)</tt> macro if one * of its base classes also inherits from this template (to resolve the * ambiguity of the #tr() function). * Translates the given text string by calling VirtualBoxBase::translate() * and passing the name of the C class as the first argument ("context of * translation") See VirtualBoxBase::translate() for more info. * @param aSourceText String to translate. * @param aComment Comment to the string to resolve possible * ambiguities (NULL means no comment). * @return Translated version of the source string in UTF-8 encoding, or * the source string itself if the translation is not found in the * This macro must be invoked inside the public section of the declaration of * the class inherited from the VirtualBoxSupportTranslation template in case * if one of its other base classes also inherits from that template. This is * necessary to resolve the ambiguity of the #tr() function. * @param C Class that inherits the VirtualBoxSupportTranslation template * more than once (through its other base clases). * Dummy macro that is used to shut down Qt's lupdate tool warnings in some * situations. This macro needs to be present inside (better at the very * beginning) of the declaration of the class that inherits from * VirtualBoxSupportTranslation template, to make lupdate happy. //////////////////////////////////////////////////////////////////////////////// * Helper for the VirtualBoxSupportErrorInfoImpl template. /// @todo switch to com::SupportErrorInfo* and remove * The MultiResult class is a com::FWResult enhancement that also acts as a * switch to turn on multi-error mode for #setError() or #setWarning() * When an instance of this class is created, multi-error mode is turned on * for the current thread and the turn-on counter is increased by one. In * multi-error mode, a call to #setError() or #setWarning() does not * overwrite the current error or warning info object possibly set on the * current thread by other method calls, but instead it stores this old * object in the IVirtualBoxErrorInfo::next attribute of the new error * This way, error/warning objects are stacked together and form a chain of * errors where the most recent error is the first one retrieved by the * calling party, the preceding error is what the * IVirtualBoxErrorInfo::next attribute of the first error points to, and so * on, up to the first error or warning occurred which is the last in the * chain. See IVirtualBoxErrorInfo documentation for more info. * When the instance of the MultiResult class goes out of scope and gets * destroyed, it automatically decreases the turn-on counter by one. If * the counter drops to zero, multi-error mode for the current thread is * turned off and the thread switches back to single-error mode where every * next error or warning object overwrites the previous one. * Note that the caller of a COM method uses a non-S_OK result code to * decide if the method has returned an error (negative codes) or a warning * (positive non-zero codes) and will query extended error info only in * these two cases. However, since multi-error mode implies that the method * doesn't return control return to the caller immediately after the first * error or warning but continues its execution, the functionality provided * by the base com::FWResult class becomes very useful because it allows to * preserve the error or the warning result code even if it is later assigned * a S_OK value multiple times. See com::FWResult for details. * Here is the typical usage pattern: // assume multi-errors are turned off here... // Turn on multi-error mode and make sure severity is preserved MultiResult rc = foo->method1(); // return on fatal error, but continue on warning or on success if (FAILED(rc)) return rc; // no matter what result, stack it and continue // return the last worst result code (it will be preserved even if // foo->method2() returns S_OK. // multi-errors are turned off here again... * @note This class is intended to be instantiated on the stack, therefore * You cannot create them using new(). Although it is possible to copy * instances of MultiResult or return them by value, please never do * that as it is breaks the class semantics (and will assert). * @copydoc com::FWResult::FWResult(). /* We need this copy constructor only for GCC that wants to have * it in case of expressions like |MultiResult rc = E_FAIL;|. But * we assert since the optimizer should actually avoid the * temporary and call the other constructor directly instead. */ /* We need this copy constructor only for GCC that wants to have * it in case of expressions like |MultiResult rc = E_FAIL;|. But * we assert since the optimizer should actually avoid the * temporary and call the other constructor directly instead. */ false /* aWarning */,
aLogIt);
true /* aWarning */,
true /* aLogIt */);
false /* aWarning */,
aLogIt);
true /* aWarning */,
true /* aLogIt */);
* This template implements ISupportErrorInfo for the given component class * and provides the #setError() method to conveniently set the error information * from within interface methods' implementations. * On Windows, the template argument must define a COM interface map using * BEGIN_COM_MAP / END_COM_MAP macros and this map must contain a * COM_INTERFACE_ENTRY(ISupportErrorInfo) definition. All interface entries * that follow it will be considered to support IErrorInfo, i.e. the * InterfaceSupportsErrorInfo() implementation will return S_OK for the * On all platforms, the template argument must also define the following * method: |public static const wchar_t *C::getComponentName()|. See * #setError(HRESULT, const char *, ...) for a description on how it is * component class that implements one or more COM interfaces * default interface for the component. This interface's IID is used * by the shortest form of #setError, for convenience. /// @todo switch to com::SupportErrorInfo* and remove // skip the com map entries until ISupportErrorInfo is found // look for the requested interface in the rest of the com map #
endif // !defined (VBOX_WITH_XPCOM) * Sets the error information for the current thread. * This information can be retrieved by a caller of an interface method * using IErrorInfo on Windows or nsIException on Linux, or the cross-platform * IVirtualBoxErrorInfo interface that provides extended error info (only * for components from the VirtualBox COM library). Alternatively, the * platform-independent class com::ErrorInfo (defined in VBox[XP]COM.lib) * can be used to retrieve error info in a convenient way. * It is assumed that the interface method that uses this function returns * an unsuccessful result code to the caller (otherwise, there is no reason * for the caller to try to retrieve error info after method invocation). * Here is a table of correspondence between this method's arguments * argument IErrorInfo nsIException IVirtualBoxErrorInfo * ---------------------------------------------------------------- * resultCode -- result resultCode * iid GetGUID -- interfaceID * component GetSource -- component * text GetDescription message text * This method is rarely needs to be used though. There are more convenient * overloaded versions, that automatically substitute some arguments * taking their values from the template parameters. See * #setError(HRESULT, const char *, ...) for an example. * @param aResultCode result (error) code, must not be S_OK * @param aIID IID of the interface that defines the error * @param aComponent name of the component that generates the error * @param aText error message (must not be null), an RTStrPrintf-like * format string in UTF-8 encoding * @param ... list of arguments for the format string * the error argument, for convenience, If an error occurs while * creating error info itself, that error is returned instead of the * This method is the same as #setError() except that it makes sure @a * aResultCode doesn't have the error severity bit (31) set when passed * down to the created IVirtualBoxErrorInfo object. * The error severity bit is always cleared by this call, thereof you can * use ordinary E_XXX result code constants, for convenience. However, this * behavior may be non-standard on some COM platforms. * Sets the error information for the current thread. * A convenience method that automatically sets the default interface * ID (taken from the I template argument) and the component name * (a value of C::getComponentName()). * See #setError(HRESULT, const GUID &, const wchar_t *, const char *text, ...) * This method is the most common (and convenient) way to set error * information from within interface methods. A typical pattern of usage * return setError(E_FAIL, "Terrible Error"); * HRESULT rc = setError(E_FAIL, "Terrible Error"); * This method is the same as #setError() except that it makes sure @a * aResultCode doesn't have the error severity bit (31) set when passed * down to the created IVirtualBoxErrorInfo object. * The error severity bit is always cleared by this call, thereof you can * use ordinary E_XXX result code constants, for convenience. However, this * behavior may be non-standard on some COM platforms. * Sets the error information for the current thread, va_list variant. * A convenience method that automatically sets the default interface * ID (taken from the I template argument) and the component name * (a value of C::getComponentName()). * See #setError(HRESULT, const GUID &, const wchar_t *, const char *text, ...) * and #setError(HRESULT, const char *, ...) for details. * This method is the same as #setErrorV() except that it makes sure @a * aResultCode doesn't have the error severity bit (31) set when passed * down to the created IVirtualBoxErrorInfo object. * The error severity bit is always cleared by this call, thereof you can * use ordinary E_XXX result code constants, for convenience. However, this * behavior may be non-standard on some COM platforms. * Sets the error information for the current thread. * A convenience method that automatically sets the component name * (a value of C::getComponentName()), but allows to specify the interface * See #setError(HRESULT, const GUID &, const wchar_t *, const char *text, ...) * This method is the same as #setError() except that it makes sure @a * aResultCode doesn't have the error severity bit (31) set when passed * down to the created IVirtualBoxErrorInfo object. * The error severity bit is always cleared by this call, thereof you can * use ordinary E_XXX result code constants, for convenience. However, this * behavior may be non-standard on some COM platforms. * Sets the error information for the current thread but doesn't put * anything in the release log. This is very useful for avoiding * harmless error from causing confusion. * It is otherwise identical to #setError(HRESULT, const char *text, ...). * Base class to track VirtualBoxBaseNEXT chlidren of the component. * This class is a preferrable VirtualBoxBase replacement for components that * operate with collections of child components. It gives two useful * Given an IUnknown instance, it's possible to quickly determine * whether this instance represents a child object that belongs to the * given component, and if so, get a valid VirtualBoxBase pointer to the * child object. The returned pointer can be then safely casted to the * actual class of the child object (to get access to its "internal" * non-interface methods) provided that no other child components implement * the same original COM interface IUnknown is queried from. * When the parent object uninitializes itself, it can easily unintialize * all its VirtualBoxBase derived children (using their * VirtualBoxBase::uninit() implementations). This is done simply by * calling the #uninitDependentChildren() method. * In order to let the above work, the following must be done: * When a child object is initialized, it calls #addDependentChild() of * its parent to register itself within the list of dependent children. * When the child object it is uninitialized, it calls * #removeDependentChild() to unregister itself. * Note that if the parent object does not call #uninitDependentChildren() when * it gets uninitialized, it must call uninit() methods of individual children * manually to disconnect them; a failure to do so will cause crashes in these * methods when children get destroyed. The same applies to children not calling * #removeDependentChild() when getting destroyed. * Note that children added by #addDependentChild() are <b>weakly</b> referenced * (i.e. AddRef() is not called), so when a child object is deleted externally * (because it's reference count goes to zero), it will automatically remove * itself from the map of dependent children provided that it follows the rules * Access to the child list is serialized using the #childrenLock() lock handle * (which defaults to the general object lock handle (see * VirtualBoxBase::lockHandle()). This lock is used by all add/remove methods of * this class so be aware of the need to preserve the {parent, child} lock order * when calling these methods. * Read individual method descriptions to get further information. * @todo This is a VirtualBoxBaseWithChildren equivalent that uses the * VirtualBoxBaseNEXT implementation. Will completely supersede * VirtualBoxBaseWithChildren after the old VirtualBoxBase implementation * Lock handle to use when adding/removing child objects from the list of * children. It is guaranteed that no any other lock is requested in methods * of this class while holding this lock. * @warning By default, this simply returns the general object's lock handle * (see VirtualBoxBase::lockHandle()) which is sufficient for most * Adds the given child to the list of dependent children. * Usually gets called from the child's init() method. * @note @a aChild (unless it is in InInit state) must be protected by * VirtualBoxBase::AutoCaller to make sure it is not uninitialized on * another thread during this method's call. * @note When #childrenLock() is not overloaded (returns the general object * lock) and this method is called from under the child's read or * write lock, make sure the {parent, child} locking order is * preserved by locking the callee (this object) for writing before * @param aChild Child object to add (must inherit VirtualBoxBase AND * implement some interface). * @note Locks #childrenLock() for writing. * Equivalent to template <class C> void addDependentChild (C *aChild) * but takes a ComObjPtr<C> argument. * Removes the given child from the list of dependent children. * Usually gets called from the child's uninit() method. * Keep in mind that the called (parent) object may be no longer available * (i.e. may be deleted deleted) after this method returns, so you must not * call any other parent's methods after that! * @note Locks #childrenLock() for writing. * @note @a aChild (unless it is in InUninit state) must be protected by * VirtualBoxBase::AutoCaller to make sure it is not uninitialized on * another thread during this method's call. * @note When #childrenLock() is not overloaded (returns the general object * lock) and this method is called from under the child's read or * write lock, make sure the {parent, child} locking order is * preserved by locking the callee (this object) for writing before * the child's lock. This is irrelevant when the method is called from * under this object's VirtualBoxBaseProto::AutoUninitSpan (i.e. in * InUninit state) since in this case no locking is done. * @param aChild Child object to remove. * @note Locks #childrenLock() for writing. * Equivalent to template <class C> void removeDependentChild (C *aChild) * but takes a ComObjPtr<C> argument. //////////////////////////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////////////// /// @todo (dmik) remove after we switch to VirtualBoxBaseNEXT completely * and supports data pointer sharing (the instance that shares the pointer is * not responsible for memory deallocation as opposed to the instance that (
"new data must not be shared")
AssertMsg(d, (
"data to copy must not be NULL"));
/// @todo (dmik) remove after we switch to VirtualBoxBaseNEXT completely * Simple template that enhances Shareable<> and supports data * Stores the current data pointer in the backup area, allocates new data * using the copy constructor on current data and makes new data active. * Deletes new data created by #backup() and restores previous data pointer * stored in the backup area, making it active again. * Commits current changes by deleting backed up data and clearing up the * backup area. The new data pointer created by #backup() remains active * and becomes the only managed pointer. * This method is much faster than #commitCopy() (just a single pointer * assignment operation), but makes the previous data pointer invalid * (because it is freed). For this reason, this method must not be * used if it's possible that data managed by this instance is shared with * some other Shareable instance. See #commitCopy(). * Commits current changes by assigning new data to the previous data * pointer stored in the backup area using the assignment operator. * New data is deleted, the backup area is cleared and the previous data * pointer becomes active and the only managed pointer. * This method is slower than #commit(), but it keeps the previous data * pointer valid (i.e. new data is copied to the same memory location). * For that reason it's safe to use this method on instances that share * managed data with other Shareable instances. #
endif // !____H_VIRTUALBOXBASEIMPL