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Subject: Re: [boost] [config] What Feature is this??
From: Peter Dimov (lists_at_[hidden])
Date: 2017-07-23 18:58:30

John Maddock wrote:
> Folks, I think I'm looking to add a new C++11 defect macro, but don't know
> what the feature is called, nor can I see a way of detecting it with
> clang's __has_feature function.
> The code I want to enable involves function overloading based on a
> decltype return type as in:
> auto integrate(args...) -> decltype(expression1);
> auto integrate(args...) -> decltype(expression2);
> where expression1 and expression2 are two mutually exclusive options (the
> conceptual requirements of args means that only one of these 2 will ever
> be satisfied).
> This works fine in msvc-14 and later and gcc-4.8 and later, but I don't
> see any current config macros which cover this case, nor can I figure out
> what this trick should be called.

This is in principle just a combination of BOOST_NO_CXX11_DECLTYPE,
depending on `expression1`, BOOST_NO_CXX11_DECLTYPE_N3276 may also be

That's without taking into account bugs, of course.

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