Use library as header only?

[correaa]

Is it possible to use the library as header only for example by defining a macro?
Would it be in principle be possible? (e.g. by systematically moving code from the cpp files to the hpp files).

Is a header only version of the library being considered?

[anthonyaue]

This would definitely make the library easy to use. If the maintainers support it I'd be happy to take a crack.

[mattgruenke]

Build times for files simply including program_options.hpp are already quite long. The whole reason I'm browsing the issues is to see if anyone filed a bug or pull request to further optimize the build times of users. If not, I'll probably take a swing at it, which will include moving a few more of the unnecessary inlines to .cpp files.

If support is added for using it header-only, I just hope that it's done in a way that doesn't hurt build times for the rest of us.