Michael Van Canneyt wrote:
Call me old fashioned, but then I think foo:=iif(Condition1, iif(Condition2, ThenExpr1, ElseExpr1), iif(Condition3, ThenExpr2, ElseExpr2)); is more clear.The "if then" construct is really confusing. "if then" is a statement, not an expression.
Yes, and that's why to get the desired semantics it's more appropriate to use if then else rather than iif() etc.
Please correct me if I'm wrong, but my understanding is that in all cases where parameters are passed to a procedure or function they are evaluated and placed on the stack before the code is called. However the if then else statement never, under any circumstances, executes code in the untaken statement/block, and it is that which is the required behaviour for an "inline if" expression.
If we want to organise it so that FPC can only evaluate function parameters when required, then it is necessary to implement ALGOL-60's "call by name" semantics, which were universally agreed to be deeply messy and perhaps not even what the standard authors intended.
-- Mark Morgan Lloyd markMLl .AT. telemetry.co .DOT. uk [Opinions above are the author's, not those of his employers or colleagues] _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
