FB_LOGF

Log a message to the specified logger, using a fmt::format() string.

Synopsis

Declared in <folly/logging/Logger.h>

#define FB_LOGF(logger, level, fmt, arg1, …)

The arguments will be processed using fmt::format(). The format syntax is similar to Python format strings.

This macro avoids evaluating the log arguments unless the log level check succeeds.

Beware that the logger argument is evaluated twice, so this argument should be an expression with no side‐effects.

Name

Description

logger

The logger identifying the log category.

level

The unqualified folly::LogLevel name.

fmt

The fmt::format format string.

arg1

The first format argument.

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