[boost] Re: [request] Sun and IBM users...

From: Daniel James (daniel_at_[hidden])
Date: 2004-09-03 11:03:31

Daniel James wrote:
> Sorry about all these tests and thanks for your patience. Here's another 
> one which uses a slightly different method that I think should will better:

Actually, can you also preprocess this test? I really think this one 
will work. Which probably means it won't.

#include <boost/preprocessor/seq/elem.hpp>
#include <boost/preprocessor/punctuation/paren.hpp>

#define IS_NULLARY(x) BOOST_PP_SEQ_ELEM(1, (IS_NULLARY_C x)(0))
#define IS_NULLARY_C() ~ BOOST_PP_RPAREN() (1) BOOST_PP_LPAREN() ~

IS_NULLARY(())    // 1
IS_NULLARY(()abc) // 1
IS_NULLARY(+)     // 0
IS_NULLARY(xyz)   // 0

#define IS_UNARY(x) IS_NULLARY(IS_UNARY_C x)
#define IS_UNARY_C(a) ()

IS_UNARY((a))    // 1
IS_UNARY((a)abc) // 1
IS_UNARY(+)      // 0
IS_UNARY(xyz)    // 0