is_convertible

From: Jeremy Siek (jsiek_at_[hidden])
Date: 2001-01-30 21:22:54

I found a workaround for the warning messages from is_convertible emmited
by g++.

The main problem was that g++ did not like passing non-POD objects through
the elipses. So what I did was dispatch to a different test in the case
when the type is a non-POD object. The different test uses conversion to
void* instead of elipses for the fallback case when the types are not
convertible.

Some other things I had to fix to get this working:
  - added parenthesis around body of BOOST_IS_CLASS macro
  - a specialization of is_array to recognize const arrays

In addition, I added a test case in type_traits_test.cpp that catches the
original problem.

The fixes have been checked in.

Cheers,
Jeremy

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 Jeremy Siek                        www: http://www.lsc.nd.edu/~jsiek/
 Ph.D. Candidate                  email: jsiek_at_[hidden]
 Univ. of Notre Dame         work phone: [phone]
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