[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5368 Reduce allocations in Grob dimension caching

[Auto mailings of changes to Lily Issues via Testlilyissues-auto]

Hide Optional in Dimension_cache and pare it down

http://codereview.appspot.com/359770043

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[issues:#5368] Reduce allocations in Grob dimension caching

Status: Started
Created: Wed Jul 04, 2018 11:09 PM UTC by Dan Eble
Last Updated: Fri Jul 06, 2018 11:45 PM UTC
Owner: Dan Eble

Reduce allocations in Grob dimension caching
Add Optional<T> offering some of the features of C++17 std::optional.

http://codereview.appspot.com/359770043

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