Noreturn and noexcept defines for Visual Studio 2013 support

[robloh]

Description

I need support for VS 2013 and discovered this can be achieved with a few small changes instead of defining DOCTEST_CONFIG_NO_EXCEPTIONS which removes support for REQUIRE

Steps to reproduce

1. define DOCTEST_THREAD_LOCAL (not documented)
2. remove [[noreturn]] and noexcept uses from doctest.h
3. compile with VS 2013

Extra information

I propose defines are implemented for [[noreturn]] and noexcept in the same way as DOCTEST_THREAD_LOCAL is done so VS 2013 (and compilers like it that have partial C++11 support) can be used by simply defining these before including doctest.h

I am willing to submit a pull request if the above approach sounds good.

• doctest version: v2.3.6

[onqtam]

Sorry for the late reply - yes, a PR would be good! Make it against the dev branch - make sure to edit doctest.cpp and doctest_fwd.h from the parts folder and trigger a CMake build to re-update the doctest.h single header. I guess it would be something like this:

#ifndef DOCTEST_NORETURN
#define DOCTEST_NORETURN [[noreturn]]
#endif

#ifndef DOCTEST_NOEXCEPT
#define DOCTEST_NOEXCEPT noexcept
#endif

These things don't have to be documented - just like DOCTEST_THREAD_LOCAL isn't.