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Daniel James 735804d636 Detail: complex is a struct in Dinkumware.
IIRC it's `class` in SGI's STL and most other implementations. The state
for similar warnings for the compilers that I've looked at:

- Visual C++ never warns because I used a pragma to disable the warning.
- GCC never warns with its standard library since it contains a
  `system_header` pragma. It might warn for other libraries.
- Clang respects GCC's pragma so it never warns for GCC's standard
  library. Forward declarations are disabled for libc++ so this isn't an
  issue there. It does warn when using Dinkumware and possibly other
  standard libraries.

I'm tempted to make container forwarding 'opt-in' rather than 'opt-out'.
Or maybe only enable for compiler/library combinations where it's known
to work.

[SVN r75561]
2011-11-19 23:29:24 +00:00
..