rcppspdlog

R Accessor Functions for spdlog Logger

Source code

Description

Several R-level functions can access the spdlog logging facilties. As spdlog is a C++-level logging library, these are R function permit concurrent logging from both R and C++.

Usage

log_setup(name = "default", level = "warn")

log_init(level = "warn")

log_filesetup(filename, name = "default", level = "warn")

log_drop(name)

log_set_pattern(s)

log_set_level(s)

log_trace(s)

log_debug(s)

log_info(s)

log_warn(s)

log_error(s)

log_critical(s)

Arguments

name	A character variable with the logging instance name, default value is ‘default’.
level	A character variable with the default logging level, default value is ‘warn’.
filename	A character variable with the logging filename if a file-based logger is instantiated.
s	A character variable with the logging pattern, level or message.

Details

Several functions are provided:

log_setup

Initializes a logger (which becomes the default logger).

log_filesetup

Initializes a file-based logger (which becomes the default).

log_drop

Removes logger (which in general should not be needed).

log_set_pattern

Changes the default logging message pattern.

log_set_level

Sets the logging level threshold.

log_trace

Logs a trace-level message.

log_debug

Logs a debug-level message.

log_info

Logs a info-level message.

log_warn

Logs a warn-level message.

log_error

Logs a error-level message.

log_critical

Logs a critical-level message.

Supported logging levels are, in order of increasing threshold values, ‘trace’, ‘debug’, ‘info’, ‘warn’, ‘error’, and ‘critical’. A message issued below the current threshold is not displayed whereas a message at or above the current threshold is displayed. The default level is ‘warn’.

Value

Nothing is returned from these functions as they are invoked for their side-effects.

See Also

The logging pattern format is described in at the repo in the page https://github.com/gabime/spdlog/wiki/3.-Custom-formatting.

Examples

library("RcppSpdlog")

log_setup("demo")  # at default level 'warn'
log_info("this message is NOT seen")
log_set_level("debug")
log_info("this message is seen")

[2025-10-11 14:16:03.482] [demo] [Process: 358] [info] this message is seen

log_warn("as is this message")

[2025-10-11 14:16:03.482] [demo] [Process: 358] [warning] as is this message