[Bug c++/54348] confusing error reported for type mismatch in conditional expression : "error: no match for ternary 'operator?:' in 'false ?"

[jason.vas.dias at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54348

--- Comment #5 from Jason Vas Dias <jason.vas.dias at gmail dot com> 2012-08-21 20:27:36 UTC ---
Oops, I was interrupted adding this comment to my initial comment - will
respond
to subsequent commment next :

Incidentally, I found this issue while developing a C++-98 replacement for
C-99 designated initializers for specific structs with generated macros :
<code>
#include <string>
#include <list>
using namespace std;

struct strct 
{
    string name, items ;
    strct (string n, string i) : name(n), items(i){}
};

#define tok(t) t

#define the_struct_strct_member( member, a0, a1, a2, a3 )            \
    ( (&(((struct strct*)0) -> member ) == &(((struct strct*)0) -> a0)) \
       ? a1                                \
       :( ( &(((struct strct*)0) -> member) ==  &(((struct strct*)0) -> a2) ) \
          ? a3                                \
          : NULL                            \
        )                                \
    )

#define struct_strct( a0, a1, a2, a3 )                    \
    (    the_struct_strct_member( tok(name)  , a0, a1, a2, a3 ),    \
     the_struct_strct_member( tok(items) , a0, a1, a2, a3 )            \
    )

void f()
{

      string myItems;
      string myName("");

      strct s  struct_strct( items, myItems, name, myName ) ;
}
</code>

This works!