Represents no type, or absence of type, for template tricks.
In a mapped-policy, indicates that an associative container is a set.
In a list-update policy, indicates that each link does not need metadata.
In a hash policy, indicates that the combining hash function is actually a ranged hash function.
In a probe policy, indicates that the combining probe function is actually a ranged probe function.
Definition at line 210 of file tag_and_trait.hpp.
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