Give a deprecation error, warning, or messsage, depending on version number.
Version numbers have the format
version, which is the most recent
version before the function (or other object) was
- The last version of ggplot2 where this function was good (in other words, the last version where it was not deprecated).
- The message to print.
gg_dep will give an error, warning, or message,
depending on the difference between the current ggplot2
version and the specified
If the current major number is greater than
version's major number, or if the current minor
number is more than 1 greater than
number, give an error.
If the current minor number differs from
minor number by one, give a warning.
If the current subminor number differs from
version's subminor number, print a message.