Dean Moldovan ec009a7ca2 Improve custom holder support (#607) ...

* Abstract away some holder functionality (resolve #585)

Custom holder types which don't have `.get()` can select the correct
function to call by specializing `holder_traits`.

* Add support for move-only holders (fix #605)

2017-01-31 17:05:44 +01:00

9.6 KiB

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