Re: [boost] BOOST_EXPLICIT_OPERATOR_BOOL macro?

Subject: Re: [boost] BOOST_EXPLICIT_OPERATOR_BOOL macro?
From: Christian Holmquist (c.holmquist_at_[hidden])
Date: 2010-04-22 10:50:20

Would it be possible to extract operator_bool.hpp into a reusable macro,
>> something like:
>>
>> #include<boost/utility/operator_bool.hpp>
>> struct some
>> {
>>   BOOST_EXPLICIT_OPERATOR_BOOL( m_value != 0; )
>>
>>  int m_value;
>> };
>>
>> What do you think?
>>
>
> I think such a tool would be useful. But I found it more convenient to
> express explicit operator bool through operator!. This allows the check to
> be arbitrarily complex, and the approach adds to compatibility with some
> compilers. See here:
>
> <
> http://boost-log.svn.sourceforge.net/viewvc/boost-log/trunk/boost-log/boost/log/detail/unspecified_bool.hpp?revision=432&view=markup
> >
>
> Usage example:
>
>  struct some
>  {
>    BOOST_LOG_OPERATOR_UNSPECIFIED_BOOL()
>    bool operator! () const { return m_value == 0; }
>
>    int m_value;
>  };
> _______________________________________________
> Unsubscribe & other changes:
> http://lists.boost.org/mailman/listinfo.cgi/boost
>

Nice!
Maybe you could move the macro from log/detail into log/utility? There's
already many small things in your utility folder IIRC, this one would make a
good addition.

Thanks,
Christian