Common Design Patterns for Symbian OS: The Foundations of by Adrian J. Issott

By Adrian J. Issott

Universal layout styles for Symbian OS is the 1st layout styles booklet that addresses Symbian OS particularly. It introduces programmers to the typical layout styles that aid enforce a wide number of purposes and providers on Symbian OS. The objective of the booklet is to supply the adventure of Symbian's builders to a much broader viewers and allow refined courses to be fast written and to a excessive ordinary. with a purpose to do that, it:

  • Provides styles in keeping with the Symbian OS architectural parts
  • Describes how styles fitted to non-mobile software program might be tailored or maybe kept away from for Symbian OS
  • Provides Symbian OS dependent examples and code illustrations

every one bankruptcy covers styles that tackle particular key difficulty skilled through builders: reminiscence functionality, time functionality, energy functionality, safety and responsiveness.

This e-book isn't really particular to any specific model of Symbian OS. whereas person examples may well come from one model or one other the styles defined during this publication are meant to be extra wide-spread and in keeping with the typical performance on hand in all releases. the place attainable the examples given for the layout styles will at once replicate the software program in Symbian OS.

universal layout styles for Symbian OS is meant for use along with a number of SDKs for particular Symbian OS telephones and with the assets on hand on the Symbian DevNet website. This facility will give you the history fabric had to aid comprehend the styles and the examples accompanying them.

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Common Design Patterns for Symbian OS: The Foundations of Smartphone Software (Symbian Press)

Universal layout styles for Symbian OS is the 1st layout styles e-book that addresses Symbian OS in particular. It introduces programmers to the typical layout styles that aid enforce a wide number of purposes and prone on Symbian OS. The aim of the e-book is to supply the adventure of Symbian's builders to a much wider viewers and let refined courses to be quick written and to a excessive usual.

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Extra resources for Common Design Patterns for Symbian OS: The Foundations of Smartphone Software (Symbian Press)

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It also reduces testing cost by allowing you to more easily isolate an object for unit testing. However, this is at the expense of reduced flexibility. 4 Pattern Elements that Are Already in Place The patterns in this book are specified in terms of Symbian OS and describe how to reuse any of the utility libraries or services provided as part of the operating system so that you can get your solution up and running as quickly as possible. 4 Correctness is difficult to establish due to the extremely large number of possible input states and the correspondingly large number of execution paths through a piece of software.

H: • __ASSERT_ALWAYS(c,p) Here c is a conditional expression which results in true or false and p is a statement which is executed if the conditional expression c is false. • __ASSERT_DEBUG(c,p) The same as __ASSERT_ALWAYS(c,p) except that it is compiled out in release builds. • ASSERT(c) The same as __ASSERT_DEBUG(c,p) except that it causes a USER 0 panic if c is false. Using this standard Symbian OS macro is no longer recommended since there’s no way of identifying which ASSERT() in a component caused a USER 0.

34 ERROR-HANDLING STRATEGIES reaction15 to system or domain errors that should be expected to occur at some point. Unfortunately, the C++ function call mechanism provides no distinct support for error propagation by itself, which encourages the development of ad-hoc solutions such as returning an error code from a function. All callers of the function then need to check this return code to see if it is an error or a valid return, which can clutter up their code considerably. As an example of where this is no problem to solve, consider the error-handling logic in the TCP network protocol.

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