mobile at majumdar.org.uk
Tue Nov 24 23:02:15 UTC 2020
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.
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