How can one switch off range checking for a part of a file. Switching off is easy, but how do I revert to the project setting later on? The pseudo-code below should explain it:
Unit1;
//here's range checking on or off as per the project setting
code here...
{$R-}
//range checking is off here because the code causes range check errors
code here...
//now I want to revert to the project setting. How do I do that?
code here...
end.
Sertac Akyuz
See: IFOPT directive.
{$IFOPT R+}
{$DEFINE RANGEON}
{$R-}
{$ELSE}
{$UNDEF RANGEON}
{$ENDIF}
//range checking is off here because the code causes range check errors
//code here...
{$IFDEF RANGEON}
{$R+}
{$UNDEF RANGEON}
{$ENDIF}
Wrap your code in $R
directives:
{$R-} // disable range checking
// do non-range-checked operations here
{$R+} // turn range checking back on
Note that the directive applies at the statement level. You cannot wrap just part of an expression with that.
来源:https://stackoverflow.com/questions/4997911/switch-off-delphi-range-checking-for-a-small-portion-of-code-only