Re: [boost] [gsoc-2013] Boost.Expected

29 Apr 2013

      On 04/29/2013 08:11 AM, Vicente J. Botet Escriba wrote:
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Le 28/04/13 23:28, Rob Stewart a écrit :
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On Apr 28, 2013, at 2:17 PM, "Pierre T."  wrote:
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On 04/28/2013 07:30 PM, Vicente J. Botet Escriba wrote:
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Yes this is quite similar if we had exceptions and we had a
try/catch block
f0().then(f1).then(f2).then(f3).visit_error(error_visitor);
try {
  f3(f2(f1(f0())));
} catch(...) {
  error_visitor();
}
When the chain gets long, try blocks make increasing sense.
Agreed.
Right, but we can work with non-exception based error.
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It would be great if we could have the equivalent for
try {
  h(f(), g());
} catch(...) {
  error_visitor();
}
when_all(f(), g()).then(h).visit_error(error_visitor);
"if_all" seems better than "when_all".
+1.
+1 too. But I'd like to keep the "then" taking more than one function.
e.then(h).then(f, g).then(h2).on_error(error_resolver);

try{
   h2(f(h()), g(h()));
} catch(…) {
   error_resolver();
}

The goal would be to enable any function composition.
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Vicente
Best regards,
Pierre T.