C# 11 and the Nine Uses of ref

C# 11 introduces a new usage of the 'ref' keyword. Here we look at all the all the ways it can be applied, and how they fit together. Source code available at: https://github.com/JasperKent/Use-of-Refs Topics include: - Passing by reference - Returning by reference - Referencing local variables - Reference structs - Reference fields - Managed references vs Managed pointers - Spans in .NET 6 and .NET 7 - Checking references for null - Making refs readonly - C++ const pointers