Re: The new Boost 17.0.0

From: Peter Dimov (pdimov_at_[hidden])
Date: 2020-11-30 00:36:01

Gavin Lambert wrote:
> > For this specific use, it doesn't need to. It can just match against a 
> > StringLike concept, as I said.
>
> Except that you can't use concepts in a compiled library, only in a 
> header-only one.  (Or it still requires you to write that concrete type 
> conversion.)

Of course you can.

class string_view
{
public:

    template<class StringLike,
        class E = enable_if_t<is_string_like<StringLike>>
    >
    string_view( StringLike const& sl ): p_( sl.data() ), n_( sl.size() ) {}
};

void my_compiled_library( string_view sv );

This is not something theoretical. E.g. Victor Zverovich has independently 
come to the same conclusion: 
https://twitter.com/vzverovich/status/1333111364357746690