On Thu, Sep 8, 2016 at 3:32 PM T L <tapir....@gmail.com> wrote:
> With the enough initial size, the underlying hashtable of the new map
will never need to be realloced in the whole copy process.
For example
dst := make(map[T]U, len(src))
See also https://golang.org/ref/spec#Making_slices_maps_and_channels
BTW: The whole "never need to be realloced in the whole copy process" thing
depends on unspecified implementation details and to me it feels like
premature optimization. Especially if not supported by first doing some
benchmarks that proved the/any/substantial difference.
--
-j
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