Re: [boost] Cxx dual library

Subject: Re: [boost] Cxx dual library
From: Niall Douglas (s_sourceforge_at_[hidden])
Date: 2016-06-06 17:03:54

On 6 Jun 2016 at 4:52, Rob Stewart wrote:

> Vicente's approach, of I have it right, is pretty simple:
> 
> namespace boost {
> namespace something {
>    using std::thread;
>    // or (conditionally selected)
>    using boost::thread;
> } }
> 
> With that, boost::something::thread is the name to use in the user's code.

Boost.BindLib, which preceded boost-lite, used exactly the pattern 
you describe.

It was found, after a year of usage, to confer no practical usage 
advantages over the aliases-bundled-into-a-namespace injection 
technique currently employed by boost-lite, and it was considerably 
harder to configure and made the config.hpp considerably more verbose 
and macro heavy.

I therefore changed to the current design which is easy and terse to 
configure, plus all macro magic in the config was eliminated. It's 
all now standard C++ and standard macro idioms.

I may yet revert to macros for #including the bind files as those 
could pick up the C++ Modules for those binds without source code 
changes, but I'm still hoping to make use of the backwards 
compatibility syntax proposed by WG21 P0273r0 [1] to avoid that.

Niall

[1]: 
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0273r0.pdf

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