Dmitri Hrybenko 7ac7eba882 stdlib: make map() dynamically dispatched ...

This change tries to recover the performance regression in map() that
was caused by moving map() to a protocol extension and degrading the
static type information (when mapping a collection, we only know that it
is a sequence).  Adding map() to the witness table allows us to provide
a specialized implementation for collections, and hopefully recover the
lost performance.

Swift SVN r28416

2015-05-11 15:59:02 +00:00

98 KiB

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