Re: [Wesnoth-dev] Adding arithmetic operations to WML

[Joseph Simmons]

{VARIABLE_OP } fufills this function, i believe. It is used like this:

{VARIABLE_OP EXPY add -1}

where EXPY is the variable being added to, add is the function being 
performed (it can also multiply, IIRC),
and -1 is the amount being added.

they don't take any number of arguments, but IMHO they make it 
unnecessary to add a predefined
preprocessor macro.

Yann Dirson wrote:

> 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 ?
>