C++ 20 standard support.

[MarcoFilimonE]

Hello!
Is there any chance to add support for C++ 20 standard?

[beltoforion]

Do you have any indication that it does not compile on a C++20 compliant compiler? What part of the code is not C++20 compliant?

[MarcoFilimonE]

We're using the conan2 package from: https://conan.io/center/recipes/muparser
We've just upgraded our conan profile to cpp 20 and now the build of the package is failing.

[beltoforion]

I cannot find anything suspicious in the line referenced in the error message and i can compile Version 2.3.4 with Visual Studio.

[MarcoFilimonE]

Which version are you using? (of VS)

[beltoforion]

VS2022; I opened the folder and build it with CMake; The compiler used was MSCV Version 1942

[MarcoFilimonE]

Ok, thanks for the information. Might be a problem with the Conan package, then. Are you the one who maintains it?

[beltoforion]

No I'm not the maintainer. Is there an easy way to reproduce the issue? I'm unfamiliar with Conan.

[MarcoFilimonE]

If I download your latest realese's source code and I change the CMake from
set(CMAKE_CXX_STANDARD 11)
to
set(CMAKE_CXX_STANDARD 20)

and then I run

1. cmake -G "Visual Studio 16 2019" -A x64 -B build/
2. cmake --build build/ --config RelWithDebInfo --parallel --verbose -- /p:CL_MPcount=%NUMBER_OF_PROCESSORS%

I get:

[beltoforion]

Thats something i can work with. This has nothing to do with C++20. For some reason min and max are defined as macros. If you put #undef min and #undef max at the top of the file it should build. I will look for a more elegant solution than that today evening.

[beltoforion]

As far as i can tell the issue should be fixed. I will prepare a new service release 2.3.5 soon.