On Tue, 25 Feb 2003, David Abrahams wrote:
> namespace boost
> {
> struct safe_bool
> {
> int value;
> typedef int safe_bool::*type;
> };
> }
>
> struct myclass
> {
> operator boost::safe_bool::type() const
> {
> return expression ? &boost::safe_bool::value : 0;
> }
> };
You don't want to do that. Add:
struct yourclass
{
operator boost::safe_bool::type() const
{
return expression? &boost::safe_bool::value : 0;
}
};
myclass m;
yourclass y;
if (m == y) {
// what's this mean?
}
This is the reason boost::function has poisoned operator== and operator!=.
Doug
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