Unary negation of Cardinal type
In the past, Delphi handled unary negation of Cardinal type numbers using 32 bit operations, which could lead to some odd results. Here is an example of code which uses unary negation:
var
c: Cardinal;
i: Int64;
begin
c := 4294967294;
i := -c;
WriteLn(i);
end;
In previous versions of Delphi, the value of i displayed would be 2. This is obviously incorrect behavior for this case. In Delphi 6, the unary negation is handled after promoting the Cardinal type to a 64 bit signed type, so the final value of i displayed is -4294967294.
It is possible that existing code may rely on the incorrect behavior of unary negation. Delphi users should be aware of this new behavior. It may be worth your time to check your code for instances of unary negation of Cardinal variables, and make sure that your application responds to the new behavior appropriately.
四． 单元DsgnIntf改名及相关变化
工程中对于DsgnIntf的引用，需要更新到一个新的名字：DesignIntf。可能还得加上DesignEditors，VCLEditors 和RTLConsts 到你的引用列表中。并且你还得将designide加入到你的Package的Requires的列表中。对
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