ros2_fmt_logger

logger.info_once("This message will only appear once, no matter how many times called");

using std::chrono_literals::operator""s;
logger.warn_throttle(1s, "This warning appears at most once per second: {}", value);

// Log only when the value changes
logger.info_on_change(sensor_value, "Sensor reading changed to: {}", sensor_value);

// Log only when change exceeds threshold
logger.error_on_change(temperature, 5.0, "Temperature changed significantly: {:.1f}°C", temperature);

#include <ros2_fmt_logger/ros2_fmt_logger.hpp>

// From an rclcpp::Logger
auto logger = ros2_fmt_logger::Logger(node->get_logger());

// With custom clock for throttling features
auto logger = ros2_fmt_logger::Logger(node->get_logger(), node->get_clock());

// Instead of: RCLCPP_INFO(logger, "Processing item %d with value %.2f", id, value);
logger.info("Processing item {} with value {:.2f}", id, value);

// Instead of: RCLCPP_ERROR(logger, "Failed to connect to %s:%d", host.c_str(), port);
logger.error("Failed to connect to {}:{}", host, port);

// Basic formatting
logger.info("Hello, {}!", name);

// Positional arguments
logger.info("Processing {1} of {0} items", total, current);

// Format specifiers
logger.info("Progress: {:.1%}", progress);  // Percentage with 1 decimal
logger.info("Value: {:08.2f}", value);     // Zero-padded floating point
logger.info("Hex: {:#x}", number);         // Hexadecimal with 0x prefix

// Container formatting (requires fmt/ranges.h)
logger.info("Values: {}", std::vector{1, 2, 3, 4});