libc++1-11 - 1:11.0.1-2~deb10u1 main

libc++ is another implementation of the C++ standard library.
.
Features and Goals
.
* Correctness as defined by the C++ standards.
* Fast execution.
* Minimal memory use.
* Fast compile times.
* ABI compatibility with gcc's libstdc++ for some low-level features such
as exception objects, rtti and memory allocation.
* Extensive unit tests.