Fix #11438 MathLib error on user defined literals

[chrchr-github]

Based on #4701, #5418

A helper function for the isdigit() test should be introduced on the simplecpp side.

Co-authored-by: gerboengels [email protected]

[firewave]

This was not built since the last commit (which is the one which triggers stuff) has the [skip ci] suffix.

I am also not sure if the co-author tag works within the PR message. That is usually put in commit messages. But as this becomes the commit message it should work...I guess.

I adjusted the tag to adhere to the correct format (Co-authored-by: gerboengels <[email protected]>) but it is shown in a weird way so I guess it does not work...

Update: If it is working you see multiple icons on the commit.

[danmar]

lgtm

[firewave]

I adjusted the tag to adhere to the correct format (Co-authored-by: gerboengels <[email protected]>) but it is shown in a weird way so I guess it does not work...

It worked! 😃

Sorry for being on this but as I caused this and somebody else picked up which I should have been looking into I wanted the work to have the proper credits.

[firewave]

We need to remember to adjust the simplecpp implementation as well.