Assignment and Arithmetic Functions in Java

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Assignment and Arithmetic Functions
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Use the first group of functions for unsigned arithmetic and assignment between different types Although some of these functions are possible in straight VB, the VBoost entries are much faster than anything you can write in VB In the VB
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Table A 1 VBoostBas Conditional Compilation Constants
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Conditional Constant VBOOST_INTERNAL Action
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Use the VB implementation instead of New VBoostRootImpI Limit the size of the generated blind vtable to {1024,512,256, 128,64,32} Remove all but the Assignment and Arithmetic functions Support both AggregateUnknown and CreateAggregate Support AggregateUnknown only Support CreateAggregate only Support both HookQI and HookQIAR Support HookQI only Support HookQIAR only Support CreateFixedSizeMemoryManager with or without compaction Support CreateFixedSizeMemoryManager with fCompactible False Support CreateFixedSizeMemoryManager with fCompactible True Support CreateDelegator and BlindFunctionPointer
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VBOOST_AggregateUnknown VBOOST_CreateAggregate VBOOST_Hooks VBOOST_HookQI VBOOST_HookQIAR VBOOST_Memory
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version, all these functions, except AssignAddRef and SafeUnknown, are simply pointers into an array of asm bytes
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Assign(pDst As Any, pSrc As Any) The Assign function is essential to the code in this book Assign is functionally equivalent to CopyMemory pDst, pSrc, 4, but it is much faster The most common size for assignment is 4 You can still use CopyMemory for other sizes Assign transfers data between two variables without any type
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checking The four ways you can call Assign are shown here with the C equivalent preceding it Dim pDst As Long, pSrc As Long '(void*)pDst = (void*)pDst VBoostAssign pDst, pSrc '*(vo d**)pDst = (void*)pSrc VBoostAssign ByVal pDst, pSrc '(void*)pDst = *(void**)pSrc VBoostAssign pDst, ByVal pSrc ' *(void**)pDst = *(void**)pSrc VBoostAssign ByVal pDst, ByVal pSrc 'Equivalent statements pDst = pSrc VBoostAssign pDst, pSrc VBoostAssign ByVal VarPtr(pDst), ByVal VarPtr(pSrc) 'More equivalent statements This demonstrates an assignment 'across types Note that Assign is faster because it doesn't 'perform an AddRef/Release on the Me object pDst = ObjPtr(Me) VBoostAssign pDst, Me 'Assign a 10-element array directly to an array variable 'SafeArrayCreateVectorEx returns a Long value which is 'assigned directly to the array variable's memory Dim x() As Long VBoostAssign ByVal VarPtrArray(x), _ SafeArrayCreateVectorEx(vbLong, 0, 10) Since Assign directly references memory, you can cause a crash very easily if you use it incorrectly Be sure to save your work often The third syntax (which dereferences a pointer value) is very common, so VBoost has a special function to help with this operation Deref(ByVal Ptr As Long) As Long Dereference the memory in Ptr and return the value This is the functional inverse of the VarPtr function
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Dim lVal As Long Dim Ptr As Long Ptr = VarPtr(lVal) DebugPrint VBoostDeref(Ptr) = lVal 'Prints True 'Use Deref in line to get the dimensions of an array Dim cDims As Long Dim x(0, 0) As Long cDims = SafeArrayGetDim(VBoostDeref(VarPtrArray(x))) 'cDims = 2 AssignZero(pDst As Any) AssignZero is used to zero out pointer This is functionally equivalent to Assign pDst, 0&, but AssignZero generates far less code because VB doesn't have to construct a temporary variable to hold the 0& constant (and you don't have to remember the trailing ampersand on the 0) AssignAddRef(pDst As Any, pSrc As Any) AssignAddRef is a special version of Assign that assumes the incoming data is an object The AddRef function is called before the function returns Since pDst is flagged as an [out] only parameter, you are not responsible for setting pDst to Nothing before calling AssignAddRef Because of the As Any types, this function never performs a QI; only an AddRef You can assign references from either a long value (provided it is a pointer to an object) or from another object Dim Mel As Class1 Dim Me2 As Class1 Dim pUnk As stdoleIUnknown VBoostAssignAddRef Mel, Me VBoostAssignAddRef Me2, ObjPtr(Me) VBoostAssignAddRef pUnk, Me 'This outputs four equivalent values DebugPrint ObjPtr(Me), ObjPtr(Mel), ObjPtr(Me2) , _ ObjPtr(pUnk) One underhanded but highly convenient use of AssignAddRef is possible with UserControl variables UserControl is what VB calls a "private base class,"
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