🚀 go-pugleaf

A.APPLEYARD@fs1.mt.umist.ac.UK writes:


>After an unexpected compiler error remark in compiling a program, I compiled
>this test program with a recent version of Gnu C++, and I got this error:-

>t$$.cc: In function `int  main()':
>t$$.cc:7: warning: cannot pass objects of type `Complex' through `...'

>Why does '...' accept structs but not classes? I have found nothing in (two
>good Gnu C++ manuals that I have) about restrictions about what can be passed
>through '...'. What other restrictions are there about '...'?

This was a warning. When passing objects through ..., as ARM explains,
data is copied RAW, that is, not constructed in any way. It would
not do to pass it initialized, because the called function would
not destruct it, or could use methods on it or whatever. So ... is
a cludge passing representations. You can do it, but the results are
far from well-defined. In the case of Complex, it might even work.