improvements to option module #4465
Merged
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I didn't add an equivalent free function for
map_consume_default
,mutate
andmutate_default
because as far as I can tell the only purpose of the free function versions is backwards compatibility.The
mutate
methods are based on a need I have in my balanced tree implementation, which arises from doing it entirely withoutCopy
/Clone
. It factors out variations of the following pattern which occurs many times: