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Shared memory and C++ Objects (cont)
Post 14533 by Seeker on Friday 1st of February 2002 12:08:32 PM
02-01-2002
More questions
It seems I just cant make myself understood....
I'll try one more time...
Here is what I want to do :
Process A creats a shared memory object
ShMem1.
The given pointer is treated as pointing to Object
Obj1 of class
Class1.
Class1 defines a virual functions F1().
Therefore, Class1 has a
virtual function table pointer
pointing to an area containing the table.
ProcessB then maps to
ShMem1,
casting the resulting pointer to Class1.
Thus Obj1 is shared.
The problem I forsee is sharing the
virtual function table pointer,
which, in ProcessB's context,
point to nothing meaningfull.
How can this problem be avoided, if at all ?
I'll try one more time...
Here is what I want to do :
Process A creats a shared memory object
ShMem1.
The given pointer is treated as pointing to Object
Obj1 of class
Class1.
Class1 defines a virual functions F1().
Therefore, Class1 has a
virtual function table pointer
pointing to an area containing the table.
ProcessB then maps to
ShMem1,
casting the resulting pointer to Class1.
Thus Obj1 is shared.
The problem I forsee is sharing the
virtual function table pointer,
which, in ProcessB's context,
point to nothing meaningfull.
How can this problem be avoided, if at all ?
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qwtcpointerdata
QwtCPointerData(3) Qwt User's Guide QwtCPointerData(3) NAME
QwtCPointerData - Data class containing two pointers to memory blocks of doubles. SYNOPSIS
#include <qwt_data.h> Inherits QwtData. Public Member Functions virtual QwtDoubleRect boundingRect () const virtual QwtData * copy () const QwtCPointerData & operator= (const QwtCPointerData &) QwtCPointerData (const double *x, const double *y, size_t size) virtual size_t size () const virtual double x (size_t i) const const double * xData () const virtual double y (size_t i) const const double * yData () const Detailed Description Data class containing two pointers to memory blocks of doubles. Constructor &; Destructor Documentation QwtCPointerData::QwtCPointerData (const double *x, const double *y, size_tsize) Constructor Parameters: x Array of x values y Array of y values size Size of the x and y arrays Warning: The programmer must assure that the memory blocks referenced by the pointers remain valid during the lifetime of the QwtPlotCPointer object. See also: QwtPlotCurve::setData(), QwtPlotCurve::setRawData() Member Function Documentation QwtDoubleRect QwtCPointerData::boundingRect () const [virtual] Returns the bounding rectangle of the data. If there is no bounding rect, like for empty data the rectangle is invalid: QwtDoubleRect::isValid() == false Reimplemented from QwtData. QwtData * QwtCPointerData::copy () const [virtual] Returns: Pointer to a copy (virtual copy constructor) Implements QwtData. QwtCPointerData & QwtCPointerData::operator= (const QwtCPointerData &data) Assignment. size_t QwtCPointerData::size () const [virtual] Returns: Size of the data set Implements QwtData. double QwtCPointerData::x (size_ti) const [virtual] Return the x value of data point i Parameters: i Index Returns: x X value of data point i Implements QwtData. const double * QwtCPointerData::xData () const Returns: Array of the x-values double QwtCPointerData::y (size_ti) const [virtual] Return the y value of data point i Parameters: i Index Returns: y Y value of data point i Implements QwtData. const double * QwtCPointerData::yData () const Returns: Array of the y-values Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 5.2.2 Mon Aug 1 2011 QwtCPointerData(3)