ALLOW_RTCc_IN_STL preprocessor usage

[ranga.narasimhan]

I recently installed acad 2024, VS 2022, ObjectARX wizard 2024.

I created a basic ARX project using the wizard and attempted to compile as it is.

I immediately got this error; #error: /RTCc rejects conformant code, so it is not supported by the C++ Standard Library. Either remove this compiler option, or define _ALLOW_RTCc_IN_STL to suppress this error.

So I changed the following snippet in stdafx.h

to 

- Is it OK to do this? Any consequences?? I'll be using MFC later in the project. Also I do dynamic type casting sometimes ;).

- Why in the first place the wizard did not define this?

- And why the (already) commented section did not have _ALLOW_RTCc_IN_STL? See first picture first line.

Thx

[tbrammer · Accepted solution]

1) Yes, it is ok to do so.

2) > Why in the first place the wizard did not define this?
Maybe because you have two options to deal with this:
Either #define _ALLOW_RTCc_IN_STL

Or set the project option C/C++ → Code generation→Check small types   to "No"

For more information about the /RTCc switch see this article.

[ranga.narasimhan]

Thank you @tbrammer .

[kerry_w_brown]

@tbrammer ,

Thanks,

I had the same issue today with the 2025 wizard ( out of the box )

Regards,