On Saturday, 1 May 2021 at 01:29:05 UTC, Mike Parker wrote:
As for the code, your main function should be `extern(C)`.
Functions you want to make available to the C side should also
be `extern(C)`, and will need equivalent declarations in C. DMD
has an experimental feature to generate C headers for you via
the `-HC` (`dmd -HC=?` for options). Then all that's left is to
link the C objects into D or the D objects into C.
Forgot to talk about going the other way. You'll need to declare
in D any C functions you'd like to call, also as `extern(C)`,
with the appropriate type translations. There are posts about
that on the D Blog:
https://dlang.org/blog/the-d-and-c-series/
Some documentation here:
https://dlang.org/spec/interfaceToC.html
A page on the D Wiki:
https://wiki.dlang.org/D_binding_for_C
And a rather lengthy chapter in my book 'Learning D'. (Email me
about that chapter if you'd like).
