The backend now automatically sanitizes non-printable characters in log messages by converting them to their hexadecimal representation. This feature ensures logs contain only safe, readable characters. You can customize or disable this feature through the BackendOptions by modifying the check_printable_char callback.

std::function<bool(char c)> check_printable_char = [](char c) { return c >= ' ' && c <= '~'; };

Added StringRef, a utility class for passing string arguments by reference without copying. Suitable for string literals or immutable strings with a guaranteed persistent lifetime. For example

#include "quill/StringRef.h"

static constexpr std::string_view sv {"string_view"};
LOG_INFO(logger, "{} {}", quill::utility::StringRef{sv}, quill::utility::StringRef{"string_literal"});

Renamed write_log_message to write_log in Sink. The formatted log_message and process_id are now also provided. This enhancement supports use cases where the formatted log_statement passed to the Sink can be ignored and overwritten with a custom format, allowing a single Logger to output different formats to various Sinks (#476)

Fixed a bug in JSON logging where previously cached named arguments could erroneously append to subsequent log statements. (#482)