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Showing posts from February, 2018

Exceptional Safety

Delphi is exception safe language. That means well written code can recover from the most horrible exceptions, including the dreaded out of memory error, and continue running in a perfectly operational state - as if nothing bad happened. Of course, that is a feature that Delphi provides, but your code and application eventually must determine logic at which point raised exception is recoverable and at which point it is not.

For instance, if you allow user to open some external file for further processing and your code trips on out of memory exception because the file is too large to process, you can fully recover from such event, show error message to the user "Sorry, selected file is too big" and application can merrily continue working. On the other hand if you trigger out of memory error during some operation your application absolutely must be able to perform, you can decide that the best course of action is terminating the application - after you show appropriate error …