Hello, (Delphi limitation, but probably applies to free pascal as well):
Take following examples: Tvalue = smallint; or Tvalue = word or Tvalue = 0..5000; ^ All of these examples are quite bad in the following way: They become very static, which makes it pretty much impossible to change their range at runtime. These types are pretty much a left over from the days of turbo pascal, and is a reason why people switched to C, where arrays where dynamic in range/size. The succ/pred functions are also pretty useless and dangerous. If a pascal type/array using these static types needs to change to a dynamic type, and these succ/pred functions will lead to out of range problems/situations. My recommendation for the Delphi language is to do away with these static types and instead change them to dynamic types, just like arrays where expanded with dynamic types. Ofcourse it's nice and perhaps even required to keep these static types for backward compatibility but it would also be nice if these types can be expanded with a dynamic type, so it can be safely used with dynamic arrays which can be any size/range. How this should be solved syntax-ically I don't know but I will give it a try below, perhaps: var MinValue : integer; MaxValue : integer; Tvalue = MinValue...MaxValue; then this type could also be used as follows: var DynamicArrayOfValues : array[Tvalue] of integer; The user could then even fall back to old style of programming: MinValue := 5000; MaxValue := 10000; DynamicArrayOfValues.Allocate; DynamicArrayOfValues [5000] := 1000; DynamicArrayOfValues [6000] := 2000; ^ array starts at 5000 kinda cool. Etc... Finally the pred/succ could be safely used as well: vValue := 5000; DynamicArrayOfValues[Pred(vValue)] := etc; // would wrap back to 6000 DynamicArrayOfValues[Succ(vValue)] := etc; // would wrap back to 5000 Just some idea's for you to explore... Bye, Skybuck.
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