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have to iterate through the contents of the array in a particular order, you can just create a separate variable to store the count, which is still more ef cient than making multiple calls to retrieve the same value)
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void CExample::Increment(TInt aValue) { CCustomContainer& theContainer = *iContainer; for (TInt index=theContainerCount();--index>=0;) { if (theContainer[index]>0) theContainer[index]+=aValue; } }
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In the code that follows, I ve added another optimization, which stores the integer value retrieved from the array from the rst call to operator[], rather than making two separate calls to it This is an optional enhancement, which probably depends on the percentage of the array to which the if statement applies As a general rule, I tend to store retrieved values if they are used twice or more, when I know they are constant between uses
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void CExample::Increment(TInt aValue) { CCustomContainer& theContainer = *iContainer; for (TInt index=theContainerCount();--index>=0;) { TInt& val = theContainer[index]; if (val>0) val+=aValue; } }
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The sections above offer a number of suggestions to improve the style of your code, concentrating on reducing memory usage and code size and increasing ef ciency You should bear them in mind, bringing them naturally into your code toolbox to make your Symbian OS code more effective However, a note of caution: don t spend undue amounts of time optimizing code until it is nished and you are sure it works Of course, you should always be looking for an optimal solution from the start, using good design and writing code which implements the design while being simple to understand and maintain A typical program spends most of its time executing only a small portion of its code Until you have
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identi ed which sections of the code are worthy of optimization, it is not worth spending extra effort ne-tuning the code When you have pro led your code, you will know what to optimize and can consider the tips above Then is the time to take another look at the code and see if the general rules I ve mentioned here (minimizing stack usage, releasing heap memory early and protecting it against leaks, and coding ef ciently when the compiler cannot make assumptions for you) can be applied And nally, you may nd it useful to look at the assembler listing of your code You can generate this using the Symbian OS command line abld tool, the use of which will be described in detail in your SDK documentation abld listing generates an assembler listing le for the source les for a project For a project with a single source le, testfilecpp, abld listing winscw udeb creates an assembler listing le (testfilelstWINSCW) for the code in testfilecpp You can inspect this to nd out which optimizations have been applied by the compiler, before coding the optimization yourself The listing will also give you an idea of which code idioms are particularly expensive in terms of the number of instructions required
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To program effectively on Symbian OS, your code needs to be robust, ef cient and compact While many of the rules for writing high quality C++ are not speci c to Symbian OS, this chapter has focused on a few guidelines which will de nitely improve code which must work with limited memory and processor resources and build with a small footprint to t onto a ROM The chapter reviewed some of the main areas covered by the Symbian OS coding standards and described the main principles that developers working on Symbian OS adhere to, namely minimizing code size, careful memory management for both stack and heap memory and ef ciency optimization You can nd more advice on writing good C++ in the books listed in the Bibliography
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