XLOG_IS_ON_IMPL_HELPER

Declared in <folly/logging/xlog.h>

This macro is used in the XLOG() implementation, and therefore must be as cheap as possible. It stores the category's LogLevel as a local static variable. The very first time this macro is evaluated it will look up the correct LogCategory and initialize the LogLevel. Subsequent calls then are only a single conditional log level check.

The LogCategory object keeps track of this local LogLevel variable and automatically keeps it up‐to‐date when the category's effective level is changed.

See XlogLevelInfo for the implementation details.

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