Ubpa small flat containers based on C++20
!!! These containers aren't AllocatorAwareContainer.
basic_flat_mapbasic_flat_multimapbasic_flat_multisetbasic_flat_setbasic_small_vectorstatic_flat_mapstatic_flat_multimapstatic_flat_multisetstatic_flat_setstatic_vectorflat_mapflat_multimapflat_multisetflat_setsmall_flat_mapsmall_flat_multimapsmall_flat_multisetsmall_flat_setsmall_vectorpmr::flat_mappmr::flat_multimappmr::flat_multisetpmr::flat_setpmr::small_flat_mappmr::small_flat_multimappmr::small_flat_multisetpmr::small_flat_setpmr::small_vector
- Clang/LLVM >= 10.0
- GCC >= 10.0
- MSVC >= 1926