[Wesnoth-dev] Adding arithmetic operations to WML

[Yann Dirson]

I've not found in the WML-ref section of the wiki anything about
existing arithmetic operations in WML.

If that does not exist yet, I suggest we add predefined preprocessor
macro "+" and maybe "*".  They shall surely take any number of
arguments, and issue a warning if any component of the operation
cannot be parsed as a number in its entirety (ie. if there are any
non-whitespace trailing non-digits).

Any objection ?
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