Mbed has both mstd::span and mbed::Span – what is the difference and when use one over the other? Will mbed::Span be replaced by mstd::span in the future?
From my understanding, mstd::span is an std-like implementation of std::span that will be available in C++20. Is that correct? Is it ready to be used?
Thanks for your help!
cc @vcoubard 
Yes it should be ready to be used and it will supersede mbed::Span. See the discussion here: https://github.com/ARMmbed/mbed-os/pull/13881 .
Ah yes I remember! Thanks a lot!
and again time to ask when the upgrade to C++17 will be made. The show stopping ‘register’ keyword should be removed now with the updated HAL for STM targets.
C++17? Live a little! Let’s do C++20!
Point made though. We’ve been using C++17 for a few months, and apart from making our code base better, we have had no issues.
I’m waiting for the custom toolchain file support for CLI 2 to jump onto the C++17 wagon. Is it currently possible to do it without doing upstream mbed changes?
What do you mean?
How do we change the C++ version (or other compiler flags for that matter) with CLI 2?
I’d say in the main CMakeLists.txt, no?
# Set C/C++ standard
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_EXTENSIONS TRUE)
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_EXTENSIONS TRUE)
Probably a good idea 
I’m just not aware of some of the best practices when it comes to CMake. I’ll try it out, thanks!