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``noexcept`` Policy
Extended applications of ``noexcept``
As of version 13 libc++ may mark functions that do not throw (i.e.,
"Throws: Nothing") as ``noexcept``. This has two primary consequences:
first, functions might not report precondition violations by throwing.
Second, user-provided functions, such as custom predicates or custom
traits, which throw might not be propagated up to the caller (unless
specified otherwise by the Standard).