Dr. Dobb's Journal - June 2008 - (Page 44)

d06keas_p4ds 4/10/08 1:49 PM Page 44 State of the Art PERFORMANCE PORTABLE C++ restricted pointers instead of the STL. On the other hand, the g++ compiler ran slightly faster on every benchmark configuration when using the STL. I had to omit the XlC compiler from this comparison because of overly aggressive optimizations that occurred when using pointers. First of all, it’s almost certain that any chosen partitioning of data at the beginning of a project changes by the time the project ends. Keeping this in mind, you want to partition your data such that there’s as little pain as possible if you have to refactor your code. There are two extremes of data organization: • Lump all your arrays into one huge class. • Separate your arrays into a very large number of small classes, each containing only a few arrays. The first choice has the advantage of better readability and refactorability. If all of your data members are prefixed with the same short Class Partitioning Before hiding the implementation of arrays behind a class API, you may want to consider how that extra layer of API affects code. Now that I’ve given hard facts above describing the technique and its performance, I turn to some potential guidelines for organizing array classes. Figure 5: Point class/Triangle class. Figure 6: Point class/Quadrilateral class. I/O Controls x x x x x High-Speed for Real-Time applications Built-In custom Property Editors Automatic and Custom Sizing. No Restrictive Bitmaps Look and Feel of Real Hardware Includes : Switches, Gauges, Sliders, Led’s, Led Bar, Led Spiral, Integer/Binary/Hexadecimal Displays, Tanks, Valves, Motors, LCD Matrix, Spectrum Display, Percent and Pie Graph, Odometers, Analog Clock, Image Display, Rotation Display, and Mode Combo Box. Plot Control x x x x x x x x High-Speed for Real-Time applications Unlimited Number of Channels & Axes Full Customizable External Toolbar Legends, Tables, Limits, Labels, Annotations, Cursors Gradient Backgrounds Log Files and Data Export and Import Save images to BMP, PNG, JPEG, TIF, GIF and EMF Many built in channel types : Tracy, Trace-XY, Bar, Bubble, Fill, Bi-Fill, Digital, Differential and Sweep Interval (EKG) Std Pack .Net x 28 Controls x Basic I/O Controls ActiveX & VCL Also Available Pro Pack .Net x 55 Controls x Basic & Advanced I/O Controls Single Developer : $1099 Additional Developer : $379 ActiveX & VCL Also Available Plot Pack .Net x Plotting : Scientific, Engineering, Strip-Chart, Digital, EKG, and more ActiveX & VCL Also Available Ultra Pack .Net x 56 Controls x Basic & Advanced I/O Controls plus Plotting Single Developer : $1699 Additional Developer : $579 ActiveX & VCL Also Available Single Developer : $559 Additional Developer : $189 Single Developer : $859 Additional Developer : $289 www.iocomp.com 888-599-2929 +1-407-226-3456 7081 Grand National Drive Suite 112, Orlando, FL 32819 44 Dr. Dobb’s Journal l www.ddj.com l June 2008 http://www.iocomp.com http://www.iocomp.com http://www.ddj.com

Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - June 2008

Dr. Dobb's Journal - June 2008 Contents Friday Night Fish Fry Alia Vox Developer Diaries There Must Be Contest Conversations Building a Test Harness for RTOS QT and Windows CE Software to Hardware Parallelization Performance Portable C++ Effective Concurrency The Agile Edge Swaine's Flames

Dr. Dobb's Journal - June 2008

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