A function which returns the absolute value of a signed value

[barakman]

Following feature request #2981, adding a function which returns the absolute (and obviously unsigned) value of a signed value.

[Amxx]

Thank you @barakman for starting a PR.

This will need some documentation and a Changelog entry.

[barakman]

Thank you @barakman for starting a PR.

This will need some documentation and a Changelog entry.

I can update the CHANGE log, but what other documentation do you want (and where)?

[Amxx]

Documentation is in docs/modules/ROOT/pages/utilities.adoc ... but I am now realizing that the Math part was not upgraded when we moved to 0.8.0 and safemath became native. Lets not touch that, we'll have to rework it later.

Just a changelog entry, fixing the lint test, and its good to merge !

[barakman]

Documentation is in docs/modules/ROOT/pages/utilities.adoc ... but I am now realizing that the Math part was not upgraded when we moved to 0.8.0 and safemath became native. Lets not touch that, we'll have to rework it later.

Just a changelog entry, fixing the lint test, and its good to merge !

BTW, I'm 100% sure that Math is the most adequate library for this function, but it seemed more adequate than SafeMath and SignedSafeMath.

I guess that SignedMath would be the most adequate (if you had such library).

[Amxx]

The utilities.adoc page is about everything under contract/utils.

I agree .abs() should be in Math.sol. SafeMath and SignedSafeMath are about overflow protection, while Math is about math primitives, which I believe abs() to be one.

[frangio]

@Amxx When we merged this we didn't have SignedMath, but now we do. Should we move this function over there? (It hasn't been released yet so this is not a breaking change.)