`ref struct` types

  • added as part of C# 7.2.
  • defined with ref struct StructName
  • always on the stack
  • never part of heap
  • cannot be element of an array
  • cannot be field type of reference type
  • can’t implement interfaces
  • can’t be boxed
  • can’t be type argument
  • can’t be captured by closure of lambda or local function
  • can’t be used in async methods
  • can’t be used in iterators

Further read:

https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/ref-struct

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