By STICHBURY JO
This publication explains the main positive factors of Symbian OS and may assist you to write down powerful C++ code. It makes a speciality of facets of excellent C++ sort that practice quite to Symbian OS.
21 goods are used to focus on specific elements of the working method and supply an easy and simple exploration of coding basics. utilizing instance code and outlines of top perform to deconstruct Symbian OS, the goods consultant you to what you have to and shouldn't do (and why), declaring commonly-made errors alongside the way in which.
applied sciences coated contain:
- client-server structure
- descriptors and dynamic bins
- active items, threads and techniques
- leaves, cleanup stack and 2-phase development
- thin templates, reliable API layout, reminiscence optimization, debug and try macros
- the ECOM plug-in framework
Symbian OS defined may be learn cover-to-cover or dipped into as a reference that would enhance your code type while programming with Symbian OS.
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Extra resources for Symbian OS Explained. Effective C++ Programming For Smartphones
Sample text
Bear in mind that C++ will interpret any nonzero value as true. For this reason, you should refrain from making direct comparisons with ETrue. • Each TBool represents 32 bits, which may be quite wasteful of memory in classes with a number of flags representing state or settings. 1 Note that these are typedefs and should not be confused with the Symbian OS TRealX class, which describes an extended 64-bit precision real value. T CLASSES 3 You may wish to use a bitfield rather than a number of booleans, given that the 32 bits of a single TBool could hold 32 boolean values in a bitfield.
Stack objects that own a resource which must be deallocated, or otherwise ”released” as part of destruction, would leak that resource in the event of a leave. Classes which are intended to be used on the stack must not need a destructor. This is the reason why Symbian OS has a class naming convention which clearly defines the allowed usage of a class (described in Chapter 1). The only classes which may be instantiated and used safely on the stack are T classes, which the Symbian OS naming convention dictates must not have a destructor, and R classes, which do not have a destructor but use Close(), or a similar method, to free the associated resource.
For this reason, you should refrain from making direct comparisons with ETrue. • Each TBool represents 32 bits, which may be quite wasteful of memory in classes with a number of flags representing state or settings. 1 Note that these are typedefs and should not be confused with the Symbian OS TRealX class, which describes an extended 64-bit precision real value. T CLASSES 3 You may wish to use a bitfield rather than a number of booleans, given that the 32 bits of a single TBool could hold 32 boolean values in a bitfield.