[boost] singleton and dlls

From: Jason Hise (chaos_at_[hidden])
Date: 2005-07-25 17:00:16

To make my singleton work with dlls, I have determined that I need to 
export/import certain global lifetime management objects so that they 
are visible across dll boundaries.  To keep the library header-only, I 
want to use the preprocessor to detect whether a windows dll, windows 
exe, or other is being built.  If it is a windows exe I want to export 
the object.  If it is a windows build and not an exe, I want to import 
the object.  And if it is not a windows build I just want to define the 
object normally.  A couple questions since this is unfamiliar territory 
for me:

Can I export from an exe and import into a dll?  It seems like normally 
the reverse would be done, but this seems like a good way to ensure that 
the object is only exported once.

What boost macros would I use to detect which type of build is occurring?

Is there any type of exporting or importing that should occur with the 
Linux equivalent of dlls?  If so, is there some uniform interface 
provided by boost that wraps things like __declspec(dllexport) and 
__declspec(dllimport) for most platforms?

-Jason