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

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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(); }

That's a second approach. A third approach could be implementing .index() and std::get<>() for expected. Niall -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/