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From: Peter Dimov (pdimov_at_[hidden])
Date: 2020-12-01 21:42:00

Antony Polukhin wrote:
> > My alternative idea of "nice to have" is a single Boost library that can
> > use either boost or std components in its interface. That's not always
> > possible to obtain though.
> I've tried that and it kind of works. There are still problems:
> * users have to use macro to customize the library
> * bcp still pulls in the Boost alternatives
> * code redability suffers from typedefs
> * you still kind of have two different libraries
> Here's how it works on Boost.DLL:
> * users define BOOST_DLL_USE_STD_FS
> * bcp still puls in Boost.Filesystem, Boost.System...
> * boost::dll::fs::path = std::conditional_t<a-lot-of-mess>
> * code in incompatible with the library that was build without

That's not what I have in mind. Macros don't solve the problem. What I have
in mind is that there is a single library that, in its interface, can
seamlessly take either boost::fs::path or std::fs::path, without the user
having to define anything.

Of course, when building the library, you probably would need to have
Boost.Filesystem available.

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