Need for version include in single header file json.hpp

[mhubergm]

Thanks for your great library and your awesome work. I am using your library in version 3.12.0. I'm interested to know, in which situation the lines 2421-2425 of json.hpp given by:

#ifdef __has_include
    #if __has_include(<version>)
        #include <version>
    #endif
#endif

are used:

• Is this a file version that I can specify myself or where should it originate from?
• When I don't want to specify such a file 'version': Is it safe to simply comment out those lines? (I've got the case of a 'version' file from another package)

Thanks for any guidance.

PS: I'm aware of the issues Fix Qt 6 include conflict and version file causes errors when a file in the project includes , but I would like to understand the mechanism and the usecase of the version file.

[nlohmann]

It's a system header, see https://en.cppreference.com/w/cpp/header/version.html.