Blog
Supporting Duff's Device in RVS
June 10th, 2016
Nested “case” labels are an obscure feature of C, and not often seen. However, examples do exist, typically hidden deep in standard library functions and our customers come across them from time to time. Here's a little article about how we recently brought support for them into RVS.
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Ada enumerations are sometimes functions
April 18th, 2016
In Ada, you declare a new enumeration type by providing a list of literals:
type Position is ( Left, Middle, Right );Ada also lets you use character literals in an enumeration:
type Calc_Op is ( '*', '/', '+', '-' );or even:
type DNACode is ( 'A', 'C', 'G', 'T', Unknown );Once you have an enumeration type, you can use these literals just as you would other literals:
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Conditional code without branches
December 10th, 2015
The difficulty of showing that real-time software safely executes within an allotted time budget arises from the variability of code execution time. Some of this variation arises from hardware effects but a great deal arises from different paths through software. We can reduce and even eliminate this variation at the expense of increased code size and average-case performance.
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