On Fri, Jun 15, 2007 at 04:25:52PM -0700, michael.a wrote: > I'm afraid I have a fairly major project which requires a Linux port. The > problem is, development has been put off for a while because GCC lacks any > means or work around which permits nesting ctors inside a union.
Rather, you're relying on a nonportable compiler extension. No matter, you have a problem to fix. I guess there's some reason why you can't use base classes and derived classes to store your data variants; perhaps it's because you want to put them into an array? One possible workaround is to use placement new. As I understand your motivation, you want to be able to construct one of several types of objects in the same fixed-size space that is large enough to hold any of them. The union is replaced by a class whose data member is a char array of sufficient size, and you can then construct sub-objects of whatever type you want in the char array with placement new.
