libc++-13-dev - 1:13.0.1-6~deb10u4 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.