Edit: From the Howard Hinnant comment below:
. . , lib++ , 20.7.2.5 shared_ptr atomic access [util.smartptr.shared.atomic]. . [atomics] . , quick_exit . C .
( , ☺).
++ '0x - <atomic>.
- , , .

, 76% <atomic>, 3% "[language.support]" 2% "[]" .
, / , libstd++.
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