Custom user structure examples

This folder contains examples of custom user structures in cupy.RawKernel (see https://docs.cupy.dev/en/stable/tutorial/kernel.html for corresponding documentation).

This folder provides three scripts ranked by increasing complexity:

1. builtins_vectors.py shows how to use CUDA builtin vectors such as float4 both as scalar parameter (pass by value from host) and array parameter in RawKernels.
2. packed_matrix.py demonstrates how to create and use templated packed structures in RawModules.
3. complex_struct.py illustrates the possibility to recursively build complex NumPy dtypes matching device structure memory layout.

All examples can be run as simple python scripts: python3.x example_name.py.