Re: [boost] BOSOT_ENUM proposal rev 4

From: Richard Jennings (richard.jennings_at_[hidden])
Date: 2005-12-20 12:08:17

I'm just trying out enum rev4.3 with Borland 5.6.4 and it fails to compile.

This is because of the 'not-found clause' in the parse method.  Eg. for  
the example

BOOST_ENUM(boolean,
        (False)
        (True)
)

that generates:
...
typedef boost::optional<boolean> optional;
static optional parse(const char* str)
{
   if(strcmp(str, "False") == 0) return optional(False);
   if(strcmp(str, "True") == 0) return optional(True);
   return false;
}
...
[taken from test/enum.cpp]
my compiler complains that it can't convert 'bool' to  
'boost::optional<boolean>' on the last return statement, and I would tend  
to agree with it!

If I change the return to be:

return optional();

Then it compiles.

Is there a particular reason why this compiler complains about the  
conversion whereas the others are fine with it?  Would you consider making  
this change to support this compiler?

Richard