Björn Fahller

The clang++-15 libc++ builds are disabled in `ci.yml` because the `install_libcxx.sh` script fails to build libc++15. Adding the `cmake` module makes it possible to build the library itself, but the...

add constrained perfect forwarding sample

3

Simple technique for giving the compiler a chance to provide better error messages. I am not aware of any drawbacks, other than lengthening the code a bit.

Release v44 solved issue 293, where matching `_` to a parameter type constructible from any `const T&` was ambigous. The solution handles that and `T&&` too. The issue remains if...