By Bruce McKinney
The 1st variation has been a huge hit with programmers who're desirous about visible uncomplicated. And during this moment variation, they're going to locate extra support for increasing what visible uncomplicated can do, together with transparent course on exploiting this language's object-oriented personality to code gains and behaviour that after looked to be the only province of C/C++ pros. just like the first version, this one tackles difficult matters with clever coding, useful instruments and research, and an unblinking kind. As visible easy maintains to adapt, it can provide extra energy (and complexity) to its audience-and this publication is a important means for programmers to take care of with that evolution. HARDCORE visible uncomplicated, moment version, could be promoted through the realm vast net and is anticipated to proceed the revenues luck of the former variation.
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Extra info for Hardcore Visual Basic
I ran all the timing tests in this book on a 90-MHz Pentium-based computer running Windows 95. The Performance sidebar on page 34 indicates the results. Although the timings are significantly different for native code versus p-code, you can reach a reasonable conclusion: no short-circuit. Short-Circuiting Logical Expressions: A Timing Example 33 34 Assert Yourself Just so you don t think that Visual Basic is unsophisticated and unnecessarily inefficient, it has its reasons. In Visual Basic, the And and Or operators double as logical operators and bitwise operators.
If you re the adventurous type who isn t afraid of disassembled machine code, you can examine Basic p-code. The key to breaking into Visual Basic code is the DebugBreak API routine. ) In case you re curious, its assembly language implementation looks like this: DebugBreak PROC int 3 ret DebugBreak ENDP The INT 3 instruction signals any active debugger to break out of execution. That s how debuggers work by temporarily putting an INT 3 wherever they want a breakpoint. 30 Examining Code The Time It Application 31 Put a DebugBreak statement in your Basic source just before the line you want to examine.
Imagine doing it in p-code. In native code, an empty procedure is just one instruction, but you still have all the code to evaluate the expression and push arguments onto the stack. An empty procedure might be comparatively cheap, but the motto of the defensive programmer is When in doubt, assert. Personally, I can t follow this advice comfortably if I know that every assertion costs a call, a return, and many worthless bytes of code. I wrote Debug Wizard to eliminate all that code. I need to run it only occasionally during the life of a project.
Hardcore Visual Basic by Bruce McKinney