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# os Constants

## Topics

### Constants

[`var OS_ATOMIC_USES_CXX: Int32`](/documentation/os/OS_ATOMIC_USES_CXX)

[`var OS_LOG_TARGET_HAS_10_12_FEATURES: Int32`](/documentation/os/OS_LOG_TARGET_HAS_10_12_FEATURES)

[`var OS_LOG_TARGET_HAS_10_13_FEATURES: Int32`](/documentation/os/OS_LOG_TARGET_HAS_10_13_FEATURES)

[`var OS_LOG_TARGET_HAS_10_14_FEATURES: Int32`](/documentation/os/OS_LOG_TARGET_HAS_10_14_FEATURES)

[`var OS_LOG_TARGET_HAS_10_15_FEATURES: Int32`](/documentation/os/OS_LOG_TARGET_HAS_10_15_FEATURES)


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