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MISRA Bulletin Board • Rule 3-4-1 and defining constants in one place
Page 1 of 1

Rule 3-4-1 and defining constants in one place

Posted: Thu Jul 26, 2018 1:28 pm
by rrosier
If one were to use the strategy of defining all the constants used within a file at the top of the file, either as static const or in an unnamed namespace, but some of the constants are used in multiple places and others are only used in single places, then those that are only used in single places will violate Rule 3-4-1.

If those that are used only in single places are subsequently moved into blocks with reduced scope, then the constants are scattered around the file.

This could create a maintenance headache because it is more difficult for a developer to find a constant.

Furthermore, if a developer needs to use a singly-used constant now in another place, they might not realise that the constant has already been defined (and then widen its scope) but instead add in a new singly-used constant of reduced scope in the new place.

It there some way to put all of the defined constants into a well-known location, but then not violate Rule 3-4-1 for the singly-used ones?

Re: Rule 3-4-1 and defining constants in one place

Posted: Thu Jul 26, 2018 6:41 pm
by dg1980
I don't think that this rule was meant to be relevant for constants (values that can not be changed) because the text only talks about variables (identifiers with values that can be changed).

But once again, we need an official clarification because the rule text leaves room for interpretation (which is a bad thing in most specifications btw.).

Re: Rule 3-4-1 and defining constants in one place

Posted: Fri Jul 27, 2018 12:11 pm
by rrosier

Re: Rule 3-4-1 and defining constants in one place

Posted: Thu Oct 25, 2018 10:32 am
by misra cpp
This rule was not intended to apply to constants, and will be clarified for the next version