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U_STABLE void U_EXPORT2 uset_freeze ( USet set  ) 

Freeze the set (make it immutable). Once frozen, it cannot be unfrozen and is therefore thread-safe until it is deleted. See the ICU4J Freezable interface for details. Freezing the set may also make some operations faster, for example uset_contains() and uset_span(). A frozen set will not be modified. (It remains frozen.)

set the set
the same set, now frozen
See also:

uset_cloneAsThawed ICU 3.8

Definition at line 57 of file uset.cpp.

    ((UnicodeSet*) set)->UnicodeSet::freeze();

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