Re: [boost] [config] std::uncaught_exceptions

Subject: Re: [boost] [config] std::uncaught_exceptions
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2018-11-05 09:53:12

On 11/5/18 6:41 AM, Lorenzo Caminiti via Boost wrote:
> Hello all,
> 
> std::uncaught_exception (singular) is deprecated in C++17 and will be
> removed in C++20. std::std::uncaught_exceptions (plural) should be
> used instead.
> 
> Will Boost.Config have a macro to detect if std::uncaught_exceptions
> is supported or not by the current compiler?
> 
> (For example, Boost.Contract implementation uses
> std::uncaught_exception and it will need to use
> std::uncaught_exceptions on C++20 compilers instead.)

Since you have to include <exception> anyway, you could test for 
__cpp_lib_uncaught_exceptions.

BTW, there are ways to implement std::uncaught_exceptions on some 
pre-C++17 compilers, this is implemented in Boost.Log:

https://github.com/boostorg/log/blob/develop/src/unhandled_exception_count.cpp

It might be a good idea to move that code somewhere for public use, e.g. 
in Boost.Exception. Opinions?