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By Brooks R.A.

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Extra resources for A critique of Common Lisp

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H Technique 30 Using an Assert Instead of, or in Addition to, Commenting Code Category: Avoid crashes and unexpected results Before while(m_rgl[++i] < lKey); // There is no way i can go past the right // bound because lKey is picked up to be the // right most entry. < previous page page_24 next page > < previous page page_25 next page > Page 25 do { j--; if(j < 0) { After while(m_rgl[++i] < lKey); // There is no way i can go past the right //bound because lKey is picked up to be the //right most entry.

Of course, using this technique is no substitute for single-stepping over every line of code that you write. Make sure that the code is doing what you expect it to be doing. Even look at the code generated by the compiler. You may find a difference between what you think you told the machine to do and what you actually told the machine to do (and in some rare cases, what the machine decided to do anyway). Caveat This only works when comparing variables to literals. It is a less intuitive way to write code, so it could end up driving you nuts.

H. h twice. Compilers don't like for you to define constants, classes, and structures more than once. In fact, they will complain quite loudly. < previous page page_20 next page > < previous page page_21 next page > Page 21 To avoid this problem, wrap your header files with sentinels. This is a fancy word for combining a #ifndef with a #define, as shown in the "After" code in this section. If the header file has already been loaded, then _ALGOR_H will be defined; the #ifndef will fail, and the stuff in the header file will be skipped.

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A critique of Common Lisp by Brooks R.A.


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