关闭Delphi范围检查一小部分代码 [英] Switch off Delphi range checking for a small portion of code only

问题描述

如何关闭范围检查文件的一部分。关闭是很容易的，但是如何稍后恢复到项目设置？下面的伪代码应该解释一下：

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.

推荐答案

请参阅： IFOPT指令。

{$IFOPT R+}
  {$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}

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