Add Iterator::try_collect() #308
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danakj
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Closes chromium#295 try_collect can collect from an iterator of `T: Try` into a container C that supports FromIterator<T: Try> to create C<U>. The actual Try types do not need to support FromIterator then, and this replaces the need for Option or Result to implement FromIterator. We needed to add another operation on Try types for this, which is to convert from T: Try in an error state to U: Try in an error state, where they have the same (or a convertible) error type. This new concept is sus::ops::TryErrorConvertibleTo and it's accessed through sus::ops::try_preserve_error(). The TryErrorConvertibleTo concept is implemented for Option, Result and std::optional.
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Closes #295
try_collectcan collect from an iterator ofT: Tryinto a containerC<U>that supportsFromIterator<T: Try>to create theC<U>.The actual
Trytypes do not need to supportFromIteratorthen, and this replaces the need forOptionorResultto implementFromIterator, if the user calls.try_collect()instead of.collect().We needed to add another operation on
Trytypes for this, which is to convert fromT: Tryin an error state toU: Tryin an error state, where they have the same (or a convertible) error type. This new concept issus::ops::TryErrorConvertibleToand it's accessed throughsus::ops::try_preserve_error().The
TryErrorConvertibleToconcept is implemented forOption,Resultandstd::optional.Then we also needed a way to take a TryType and a type Bar and produce the type TryType so that we can say try_collect<Vec> on an iterator of Option and get back Option<Vec>. This is done through
sus::ops::TryRemapOutputType<TryType, NewOutputType>.