On Tuesday, 24 November 2020 at 22:26:34 UTC, Paul Backus wrote:
Nice. Is it possible to describe how these types are
represented in memory? Anyone who uses unions and wants to use
these would want to know whether these types are laid out like
unions or not. What is the size of the type - is it equal to
the largest member?
SumType uses a union internally, so the types all share the
same memory. The size of the SumType is equal to the size of
the union plus the size of the tag (plus padding, if necessary).
Thanks - I was suggesting adding a description to the
documentation, unless it is already there. Also an ABI
specification would be helpful - what happens when a value is
passed to a C program.
