Shapes

cuda::std::size_t	Defines an extent of bytes	libcu++ 1.0.0 / CCCL 2.0.0 / CUDA 10.2
cuda::aligned_size_t	Defines an extent of bytes with a statically defined alignment.	libcu++ 1.2.0 / CCCL 2.0.0 / CUDA 11.1