debug macro instruction 除错宏指令
The assertion and the extra logging code appear only when the DEBUG macro is set during development. These statements disappear in the final production build.
断言和额外的日志代码只出现在开发过程设置的DEBUG宏块中。这些声明不会出现在最终产品中。
If you ever had the need to debug a macro expansion you had to discover, that your tools provide only little or no support for this task.
如果你需要对宏展开进行调试，你会发现你的工具只对此提供了很少或没有支持。
The ASSERT macro catches program errors only in the Debug version of your program.
assert宏仅在程序的调试版本中捕捉程序错误。
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