Re: [boost] [outcome] High level summary of review feedback accepted so far

Niall Douglas wrote:

I would assume an expected could only return a std::variant from its .error(). I can't think what else it could do.

As the foremost authority on the nonexistent expected, I can tell you what it does: // F shall be in E... template<class F> bool has_error() const; template<class F> F error() const; // if sizeof...(E) == 1 bool has_error() const; E1 error() const; It returns the equivalent of variant not from error(), but from unexpected unexpected() const; which allows you to expected function() { expected e1 = function1(); if( !e1 ) return e1.unexpected(); expected e2 = function2(); if( !e2 ) return e2.unexpected(); return e1.value() + e2.value(); }