Reduce the Size of Program Code in Java

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211 Reduce the Size of Program Code
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Space is at a premium on Symbian OS Where possible, you should attempt to minimize the size of your program binary and its use of memory without unduly complicating your code In previous chapters, I ve already discussed some of the factors that may increase the size of your object code For example, 5 mentioned that the use of the _L macro is deprecated and you should prefer to use _LIT for literal descriptors The TRAP/TRAPD macros, which I discussed in 2, can also bloat program code The following discussion describes some other factors to consider which may help you trim the size of your program binaries
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Beware of inlining functions, since you may end up bloating your program code while you are trying to speed it up You ll nd a lot more about the hazards of inlining in Scott Meyers Effective C++1 To summarize: the inline directive, when obeyed by a compiler, will replace a call to the inlined function with the body of the function, thus avoiding the overhead of a function call However, this will increase the size of your code if the function code is anything other than trivial (If the directive is ignored things may be even worse, since the compiler may generate multiple copies of your function code, while still making function calls to it, thus bloating your binary without any of the speed bene ts from forgoing the function call) On Symbian OS, limited memory resources typically mean that the overhead of a function call is preferable to the potential code bloat from a large section of inlined code Furthermore, inlined code is impossible to upgrade without breaking binary compatibility If a client uses your function, it is compiled into their code, and any change you make to it later will force them to recompile, as I described in 18 For both reasons, stick to the rule that you should prefer a function call and return over an inlined function unless the function is trivial, such as a simple getter type function, shown below:
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class TBook { public: inline TInt Price() const {return (iPrice);}; private: TInt iPrice; };
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Other candidates for inlining include trivial T class constructors and templated functions, particularly when using the thin template idiom discussed in 19
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Code reuse has the bene t that you get to use tried and tested code This is great if the solution ts your problem exactly, but how many times have you found that it doesn t quite do what you want Often you may nd yourself writing code from scratch or copying and reworking code from a previous solution to solve your problem Both courses are understandable if the prior solution doesn t t exactly, but it is wasteful of space to end up with two or more different solutions to a common problem
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1 See Item 33 of Effective C++: 50 speci c ways to improve your programs and designs, details of which can be found in the Bibliography
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REDUCE THE SIZE OF PROGRAM CODE
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Sometimes it may be possible to abstract the common code into a utility module which can be used by both solutions Of course, this isn t always possible, since you may not be able to modify the original source If you cannot modify the original code, do you have to copy it for your solution, or can you use it and perform additional tasks to get the result you need If you do have to copy and modify the code, try to copy only as much as is required, and make sure you adapt it where you need to, rewriting it completely if necessary so it is ef cient for the task you are trying to achieve When writing a class, you should endeavor to make it easy to use and thus to reuse Sometimes code is dismissed as being impossible to reuse because it s so hard to work out what it s doing or how best to use it This is partly a problem with the language, because C++ is complex and it is easy to use it incorrectly 20 discusses some of the ways to de ne a clear and ef cient API, which will make your life easier in the testing, maintenance and documentation phases and will improve the chances that potential clients will adopt it, rather than duplicate effort and code by writing their own version
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