You can even stick with only one "save" function and just simulate defaults.
Say your function has the signature
void save(X,Y,Z)
where X, Y and Z are some types, and you would like to simulate
void save(X,Y, Z,bool=false)
where setting the bool parameter to true would cause the new behaviour - no
popup on failure, but storing the error message in a global variable
save_last_error. To do this in C, you would use a variable argument list, i.e.
void save(X,Y,...)
and use va_arg to scan for the parameters which are present, and deduce the
value of the bool from it.
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https://github.com/geany/geany/issues/815#issuecomment-165044089
