Re: [boost] PR: Remove safe_bool idiom from boost.tribool

Subject: Re: [boost] PR: Remove safe_bool idiom from boost.tribool
From: Peter Dimov (lists_at_[hidden])
Date: 2018-05-22 01:02:13

Robert Ramey wrote:

> > I'm strongly opposed to downgrading from safe_bool to implicit bool.
> 
> I made my argument why this is good idea.  What's wrong with my argument?

Defining a conversion to bool enables unwanted operations such as

    tribool b1, b2;

    b1 < b2;
    b1 + b2;
    b1 + 5;
    b1 * 2;

That's the whole point of "safe bool", to avoid those.