Jacques-Pascal Deplaix wrote: > >Unwanted side effects can happen if you evaluate an expression more > >than once, e.g. if you substituted the full expression for every > >_tmp2_ in the C code. Expressions with side-effects include function > >calls and stuff which modifies variables, e.g. p++. You don't want to > >do 'p++' twice or call the function twice. > > Thanks. I give a clearer example of what you're saying: > > y = x++ + --x;
No, that isn't what I meant. Someone who knows the Vala compiler well could probably come up with a better example, but the compiler could in theory transform this: y = x++; z = y * y; into this: z = x++ * x++; But that would be a mistake. You need to hold that intermediate 'y' value somewhere to avoid doing x++ twice. So some temporary variables are always needed. Jim -- Jim Peters (_)/=\~/_(_) j...@uazu.net (_) /=\ ~/_ (_) UazĂș (_) /=\ ~/_ (_) http:// in Peru (_) ____ /=\ ____ ~/_ ____ (_) uazu.net _______________________________________________ vala-list mailing list vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list