On November 6, 2017 7:13:06 PM Peter Dimov via Boost
Andrey Semashev wrote:
You're refuting your own argument, because if g++-15 would need 200 positive macros compared to g++-7's 100, g++-7 would need 100 negative macros.
g++-7 will be out of wide use by then, so it doesn't matter.
That's not true on at least three levels.
Why?
The good thing about positive macros is that an old compiler never needs maintenance. With negative macros you have to keep adding them to it.
That is not more maintenance than adding positive macros for newer compilers.
It is. Maintaining the new compilers is constant regardless of the macro type, and maintaining the old compilers is only required for negative macros.
I don't see how. You have to add new macros as they come with new C++ versions or someone requests them. You have to test them. All this is the same amount of work regardless of whether the macro is positive or negative.