[bluGill]

Modules are starting to come out. They have some growing pains, but they are now ready for early adopters and are looking like they will be good. I'm still in wait and see mode (I'm not an early adopter), but so far everything just looks like growing pains that will be solved and then they will take off.

[calibas]

At the current rate, we'll have full module support for all of the most popular C++ libraries sometime around Apr 7th, 2618.

https://arewemodulesyet.org/

[bluGill]

I expect modules to follow a S curve of growth. Starting in about 2 years projects will start to adopt in mass, and over the next 5-10 years there will be fast growth and then (in about 12 years!) on a few stragglers will not use modules. They are not free to adopt but there appear to be a lot of long term savings from paying the price.

[einpoklum]

I'll mention that library maintainers/authors can't even _consider_ modules unless they set C++20 as a requirement. Many/most popular libraries will not do that anytime soon. I maintain a moderately-popular library and my requirement is C++11... now, to be fair, I started it back in 2016-2017; but still, I won't even consider requiring C++20 until C++17-and-earlier application code is close to disappearing.