/src/spdlog/include/spdlog/logger.h

Source
// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)

#pragma once

// Thread safe logger (except for set_error_handler())
// Has name, log level, vector of std::shared sink pointers and formatter
// Upon each log write the logger:
// 1. Checks if its log level is enough to log the message and if yes:
// 2. Call the underlying sinks to do the job.
// 3. Each sink use its own private copy of a formatter to format the message
// and send to its destination.
//
// The use of private formatter per sink provides the opportunity to cache some
// formatted data, and support for different format per sink.

#include <spdlog/common.h>
#include <spdlog/details/backtracer.h>
#include <spdlog/details/log_msg.h>

#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
#ifndef _WIN32
#error SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows
#endif
#include <spdlog/details/os.h>
#endif

#include <vector>

#ifndef SPDLOG_NO_EXCEPTIONS
#define SPDLOG_LOGGER_CATCH(location)                                                 \
    catch (const std::exception &ex) {                                                \
        if (location.filename) {                                                      \
            err_handler_(fmt_lib::format(SPDLOG_FMT_STRING("{} [{}({})]"), ex.what(), \
                                         location.filename, location.line));          \
        } else {                                                                      \
            err_handler_(ex.what());                                                  \
        }                                                                             \
    }                                                                                 \
    catch (...) {                                                                     \
        err_handler_("Rethrowing unknown exception in logger");                       \
        throw;                                                                        \
    }
#else
#define SPDLOG_LOGGER_CATCH(location)
#endif

namespace spdlog {

class SPDLOG_API logger {
public:
    // Empty logger
    explicit logger(std::string name)
        : name_(std::move(name)),
          sinks_() {}

    // Logger with range on sinks
    template <typename It>
    logger(std::string name, It begin, It end)
        : name_(std::move(name)),
          sinks_(begin, end) {}

    // Logger with single sink
    logger(std::string name, sink_ptr single_sink)
        : logger(std::move(name), {std::move(single_sink)}) {}

    // Logger with sinks init list
    logger(std::string name, sinks_init_list sinks)
        : logger(std::move(name), sinks.begin(), sinks.end()) {}

    virtual ~logger() = default;

    logger(const logger &other);
    logger(logger &&other) SPDLOG_NOEXCEPT;
    logger &operator=(logger other) SPDLOG_NOEXCEPT;
    void swap(spdlog::logger &other) SPDLOG_NOEXCEPT;

    template <typename... Args>
    void log(source_loc loc, level::level_enum lvl, format_string_t<Args...> fmt, Args &&...args) {
        log_(loc, lvl, details::to_string_view(fmt), std::forward<Args>(args)...);
    }

    template <typename... Args>
    void log(level::level_enum lvl, format_string_t<Args...> fmt, Args &&...args) {
        log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
    }

    template <typename T>
    void log(level::level_enum lvl, const T &msg) {
        log(source_loc{}, lvl, msg);
    }

    // T cannot be statically converted to format string (including string_view/wstring_view)
    template <class T,
              typename std::enable_if<!is_convertible_to_any_format_string<const T &>::value,
                                      int>::type = 0>
    void log(source_loc loc, level::level_enum lvl, const T &msg) {
        log(loc, lvl, "{}", msg);
    }

    void log(log_clock::time_point log_time,
             source_loc loc,
             level::level_enum lvl,
             string_view_t msg) {
        bool log_enabled = should_log(lvl);
        bool traceback_enabled = tracer_.enabled();
        if (!log_enabled && !traceback_enabled) {
            return;
        }

        details::log_msg log_msg(log_time, loc, name_, lvl, msg);
        log_it_(log_msg, log_enabled, traceback_enabled);
    }

    void log(source_loc loc, level::level_enum lvl, string_view_t msg) {
        bool log_enabled = should_log(lvl);
        bool traceback_enabled = tracer_.enabled();
        if (!log_enabled && !traceback_enabled) {
            return;
        }

        details::log_msg log_msg(loc, name_, lvl, msg);
        log_it_(log_msg, log_enabled, traceback_enabled);
    }

    void log(level::level_enum lvl, string_view_t msg) { log(source_loc{}, lvl, msg); }

    template <typename... Args>
    void trace(format_string_t<Args...> fmt, Args &&...args) {
        log(level::trace, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void debug(format_string_t<Args...> fmt, Args &&...args) {
        log(level::debug, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void info(format_string_t<Args...> fmt, Args &&...args) {
        log(level::info, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void warn(format_string_t<Args...> fmt, Args &&...args) {
        log(level::warn, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void error(format_string_t<Args...> fmt, Args &&...args) {
        log(level::err, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void critical(format_string_t<Args...> fmt, Args &&...args) {
        log(level::critical, fmt, std::forward<Args>(args)...);
    }

#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
    template <typename... Args>
    void log(source_loc loc, level::level_enum lvl, wformat_string_t<Args...> fmt, Args &&...args) {
        log_(loc, lvl, details::to_string_view(fmt), std::forward<Args>(args)...);
    }

    template <typename... Args>
    void log(level::level_enum lvl, wformat_string_t<Args...> fmt, Args &&...args) {
        log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
    }

    void log(log_clock::time_point log_time,
             source_loc loc,
             level::level_enum lvl,
             wstring_view_t msg) {
        bool log_enabled = should_log(lvl);
        bool traceback_enabled = tracer_.enabled();
        if (!log_enabled && !traceback_enabled) {
            return;
        }

        memory_buf_t buf;
        details::os::wstr_to_utf8buf(wstring_view_t(msg.data(), msg.size()), buf);
        details::log_msg log_msg(log_time, loc, name_, lvl, string_view_t(buf.data(), buf.size()));
        log_it_(log_msg, log_enabled, traceback_enabled);
    }

    void log(source_loc loc, level::level_enum lvl, wstring_view_t msg) {
        bool log_enabled = should_log(lvl);
        bool traceback_enabled = tracer_.enabled();
        if (!log_enabled && !traceback_enabled) {
            return;
        }

        memory_buf_t buf;
        details::os::wstr_to_utf8buf(wstring_view_t(msg.data(), msg.size()), buf);
        details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
        log_it_(log_msg, log_enabled, traceback_enabled);
    }

    void log(level::level_enum lvl, wstring_view_t msg) { log(source_loc{}, lvl, msg); }

    template <typename... Args>
    void trace(wformat_string_t<Args...> fmt, Args &&...args) {
        log(level::trace, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void debug(wformat_string_t<Args...> fmt, Args &&...args) {
        log(level::debug, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void info(wformat_string_t<Args...> fmt, Args &&...args) {
        log(level::info, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void warn(wformat_string_t<Args...> fmt, Args &&...args) {
        log(level::warn, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void error(wformat_string_t<Args...> fmt, Args &&...args) {
        log(level::err, fmt, std::forward<Args>(args)...);
    }

    template <typename... Args>
    void critical(wformat_string_t<Args...> fmt, Args &&...args) {
        log(level::critical, fmt, std::forward<Args>(args)...);
    }
#endif

    template <typename T>
    void trace(const T &msg) {
        log(level::trace, msg);
    }

    template <typename T>
    void debug(const T &msg) {
        log(level::debug, msg);
    }

    template <typename T>
    void info(const T &msg) {
        log(level::info, msg);
    }

    template <typename T>
    void warn(const T &msg) {
        log(level::warn, msg);
    }

    template <typename T>
    void error(const T &msg) {
        log(level::err, msg);
    }

    template <typename T>
    void critical(const T &msg) {
        log(level::critical, msg);
    }

    // return true if logging is enabled for the given level.
    bool should_log(level::level_enum msg_level) const {
        return msg_level >= level_.load(std::memory_order_relaxed);
    }

    // return true if backtrace logging is enabled.
    bool should_backtrace() const { return tracer_.enabled(); }

    void set_level(level::level_enum log_level);

    level::level_enum level() const;

    const std::string &name() const;

    // set formatting for the sinks in this logger.
    // each sink will get a separate instance of the formatter object.
    void set_formatter(std::unique_ptr<formatter> f);

    // set formatting for the sinks in this logger.
    // equivalent to
    //     set_formatter(make_unique<pattern_formatter>(pattern, time_type))
    // Note: each sink will get a new instance of a formatter object, replacing the old one.
    void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local);

    // backtrace support.
    // efficiently store all debug/trace messages in a circular buffer until needed for debugging.
    void enable_backtrace(size_t n_messages);
    void disable_backtrace();
    void dump_backtrace();

    // flush functions
    void flush();
    void flush_on(level::level_enum log_level);
    level::level_enum flush_level() const;

    // sinks
    const std::vector<sink_ptr> &sinks() const;

    std::vector<sink_ptr> &sinks();

    // error handler
    void set_error_handler(err_handler);

    // create new logger with same sinks and configuration.
    virtual std::shared_ptr<logger> clone(std::string logger_name);

protected:
    std::string name_;
    std::vector<sink_ptr> sinks_;
    spdlog::level_t level_{level::info};
    spdlog::level_t flush_level_{level::off};
    err_handler custom_err_handler_{nullptr};
    details::backtracer tracer_;

    // common implementation for after templated public api has been resolved
    template <typename... Args>
    void log_(source_loc loc, level::level_enum lvl, string_view_t fmt, Args &&...args) {
        bool log_enabled = should_log(lvl);
        bool traceback_enabled = tracer_.enabled();
        if (!log_enabled && !traceback_enabled) {
            return;
        }
        SPDLOG_TRY {
            memory_buf_t buf;
#ifdef SPDLOG_USE_STD_FORMAT
            fmt_lib::vformat_to(std::back_inserter(buf), fmt, fmt_lib::make_format_args(args...));
#else
            fmt::vformat_to(fmt::appender(buf), fmt, fmt::make_format_args(args...));
#endif

            details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
            log_it_(log_msg, log_enabled, traceback_enabled);
        }
        SPDLOG_LOGGER_CATCH(loc)
    }

#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
    template <typename... Args>
    void log_(source_loc loc, level::level_enum lvl, wstring_view_t fmt, Args &&...args) {
        bool log_enabled = should_log(lvl);
        bool traceback_enabled = tracer_.enabled();
        if (!log_enabled && !traceback_enabled) {
            return;
        }
        SPDLOG_TRY {
            // format to wmemory_buffer and convert to utf8
            wmemory_buf_t wbuf;
            fmt_lib::vformat_to(std::back_inserter(wbuf), fmt,
                                fmt_lib::make_format_args<fmt_lib::wformat_context>(args...));

            memory_buf_t buf;
            details::os::wstr_to_utf8buf(wstring_view_t(wbuf.data(), wbuf.size()), buf);
            details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
            log_it_(log_msg, log_enabled, traceback_enabled);
        }
        SPDLOG_LOGGER_CATCH(loc)
    }
#endif  // SPDLOG_WCHAR_TO_UTF8_SUPPORT

    // log the given message (if the given log level is high enough),
    // and save backtrace (if backtrace is enabled).
    void log_it_(const details::log_msg &log_msg, bool log_enabled, bool traceback_enabled);
    virtual void sink_it_(const details::log_msg &msg);
    virtual void flush_();
    void dump_backtrace_();
    bool should_flush_(const details::log_msg &msg) const;

    // handle errors during logging.
    // default handler prints the error to stderr at max rate of 1 message/sec.
    void err_handler_(const std::string &msg) const;
};

void swap(logger &a, logger &b) noexcept;

}  // namespace spdlog

#ifdef SPDLOG_HEADER_ONLY
#include "logger-inl.h"
#endif

Coverage Report

Created: 2026-02-14 07:07

Line	Count	Source
1		// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
2		// Distributed under the MIT License (http://opensource.org/licenses/MIT)
3
4		#pragma once
5
6		// Thread safe logger (except for set_error_handler())
7		// Has name, log level, vector of std::shared sink pointers and formatter
8		// Upon each log write the logger:
9		// 1. Checks if its log level is enough to log the message and if yes:
10		// 2. Call the underlying sinks to do the job.
11		// 3. Each sink use its own private copy of a formatter to format the message
12		// and send to its destination.
13		//
14		// The use of private formatter per sink provides the opportunity to cache some
15		// formatted data, and support for different format per sink.
16
17		#include <spdlog/common.h>
18		#include <spdlog/details/backtracer.h>
19		#include <spdlog/details/log_msg.h>
20
21		#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
22		#ifndef _WIN32
23		#error SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows
24		#endif
25		#include <spdlog/details/os.h>
26		#endif
27
28		#include <vector>
29
30		#ifndef SPDLOG_NO_EXCEPTIONS
31		#define SPDLOG_LOGGER_CATCH(location) \
32	9.25k	catch (const std::exception &ex) { \
33	5.24k	if (location.filename) { \
34	2.62k	err_handler_(fmt_lib::format(SPDLOG_FMT_STRING("{} [{}({})]"), ex.what(), \
35	2.62k	location.filename, location.line)); \
36	2.62k	} else { \
37	2.62k	err_handler_(ex.what()); \
38	2.62k	} \
39	5.24k	} \
40	9.25k	catch (...) { \
41	0	err_handler_("Rethrowing unknown exception in logger"); \
42	0	throw; \
43	0	}
44		#else
45		#define SPDLOG_LOGGER_CATCH(location)
46		#endif
47
48		namespace spdlog {
49
50		class SPDLOG_API logger {
51		public:
52		// Empty logger
53		explicit logger(std::string name)
54		: name_(std::move(name)),
55	0	sinks_() {}
56
57		// Logger with range on sinks
58		template <typename It>
59		logger(std::string name, It begin, It end)
60	2	: name_(std::move(name)),
61	2	sinks_(begin, end) {}
62
63		// Logger with single sink
64		logger(std::string name, sink_ptr single_sink)
65	2	: logger(std::move(name), {std::move(single_sink)}) {}
66
67		// Logger with sinks init list
68		logger(std::string name, sinks_init_list sinks)
69	2	: logger(std::move(name), sinks.begin(), sinks.end()) {}
70
71	2	virtual ~logger() = default;
72
73		logger(const logger &other);
74		logger(logger &&other) SPDLOG_NOEXCEPT;
75		logger &operator=(logger other) SPDLOG_NOEXCEPT;
76		void swap(spdlog::logger &other) SPDLOG_NOEXCEPT;
77
78		template <typename... Args>
79	9.06k	void log(source_loc loc, level::level_enum lvl, format_string_t<Args...> fmt, Args &&...args) {
80	9.06k	log_(loc, lvl, details::to_string_view(fmt), std::forward<Args>(args)...);
81	9.06k	}
82
83		template <typename... Args>
84	5.43k	void log(level::level_enum lvl, format_string_t<Args...> fmt, Args &&...args) {
85	5.43k	log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
86	5.43k	}
87
88		template <typename T>
89		void log(level::level_enum lvl, const T &msg) {
90		log(source_loc{}, lvl, msg);
91		}
92
93		// T cannot be statically converted to format string (including string_view/wstring_view)
94		template <class T,
95		typename std::enable_if<!is_convertible_to_any_format_string<const T &>::value,
96		int>::type = 0>
97		void log(source_loc loc, level::level_enum lvl, const T &msg) {
98		log(loc, lvl, "{}", msg);
99		}
100
101		void log(log_clock::time_point log_time,
102		source_loc loc,
103		level::level_enum lvl,
104	0	string_view_t msg) {
105	0	bool log_enabled = should_log(lvl);
106	0	bool traceback_enabled = tracer_.enabled();
107	0	if (!log_enabled && !traceback_enabled) {
108	0	return;
109	0	}
110	0
111	0	details::log_msg log_msg(log_time, loc, name_, lvl, msg);
112	0	log_it_(log_msg, log_enabled, traceback_enabled);
113	0	}
114
115	0	void log(source_loc loc, level::level_enum lvl, string_view_t msg) {
116	0	bool log_enabled = should_log(lvl);
117	0	bool traceback_enabled = tracer_.enabled();
118	0	if (!log_enabled && !traceback_enabled) {
119	0	return;
120	0	}
121	0
122	0	details::log_msg log_msg(loc, name_, lvl, msg);
123	0	log_it_(log_msg, log_enabled, traceback_enabled);
124	0	}
125
126	0	void log(level::level_enum lvl, string_view_t msg) { log(source_loc{}, lvl, msg); }
127
128		template <typename... Args>
129	906	void trace(format_string_t<Args...> fmt, Args &&...args) {
130	906	log(level::trace, fmt, std::forward<Args>(args)...);
131	906	}
132
133		template <typename... Args>
134	906	void debug(format_string_t<Args...> fmt, Args &&...args) {
135	906	log(level::debug, fmt, std::forward<Args>(args)...);
136	906	}
137
138		template <typename... Args>
139	906	void info(format_string_t<Args...> fmt, Args &&...args) {
140	906	log(level::info, fmt, std::forward<Args>(args)...);
141	906	}
142
143		template <typename... Args>
144	906	void warn(format_string_t<Args...> fmt, Args &&...args) {
145	906	log(level::warn, fmt, std::forward<Args>(args)...);
146	906	}
147
148		template <typename... Args>
149	906	void error(format_string_t<Args...> fmt, Args &&...args) {
150	906	log(level::err, fmt, std::forward<Args>(args)...);
151	906	}
152
153		template <typename... Args>
154	906	void critical(format_string_t<Args...> fmt, Args &&...args) {
155	906	log(level::critical, fmt, std::forward<Args>(args)...);
156	906	}
157
158		#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
159		template <typename... Args>
160		void log(source_loc loc, level::level_enum lvl, wformat_string_t<Args...> fmt, Args &&...args) {
161		log_(loc, lvl, details::to_string_view(fmt), std::forward<Args>(args)...);
162		}
163
164		template <typename... Args>
165		void log(level::level_enum lvl, wformat_string_t<Args...> fmt, Args &&...args) {
166		log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
167		}
168
169		void log(log_clock::time_point log_time,
170		source_loc loc,
171		level::level_enum lvl,
172		wstring_view_t msg) {
173		bool log_enabled = should_log(lvl);
174		bool traceback_enabled = tracer_.enabled();
175		if (!log_enabled && !traceback_enabled) {
176		return;
177		}
178
179		memory_buf_t buf;
180		details::os::wstr_to_utf8buf(wstring_view_t(msg.data(), msg.size()), buf);
181		details::log_msg log_msg(log_time, loc, name_, lvl, string_view_t(buf.data(), buf.size()));
182		log_it_(log_msg, log_enabled, traceback_enabled);
183		}
184
185		void log(source_loc loc, level::level_enum lvl, wstring_view_t msg) {
186		bool log_enabled = should_log(lvl);
187		bool traceback_enabled = tracer_.enabled();
188		if (!log_enabled && !traceback_enabled) {
189		return;
190		}
191
192		memory_buf_t buf;
193		details::os::wstr_to_utf8buf(wstring_view_t(msg.data(), msg.size()), buf);
194		details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
195		log_it_(log_msg, log_enabled, traceback_enabled);
196		}
197
198		void log(level::level_enum lvl, wstring_view_t msg) { log(source_loc{}, lvl, msg); }
199
200		template <typename... Args>
201		void trace(wformat_string_t<Args...> fmt, Args &&...args) {
202		log(level::trace, fmt, std::forward<Args>(args)...);
203		}
204
205		template <typename... Args>
206		void debug(wformat_string_t<Args...> fmt, Args &&...args) {
207		log(level::debug, fmt, std::forward<Args>(args)...);
208		}
209
210		template <typename... Args>
211		void info(wformat_string_t<Args...> fmt, Args &&...args) {
212		log(level::info, fmt, std::forward<Args>(args)...);
213		}
214
215		template <typename... Args>
216		void warn(wformat_string_t<Args...> fmt, Args &&...args) {
217		log(level::warn, fmt, std::forward<Args>(args)...);
218		}
219
220		template <typename... Args>
221		void error(wformat_string_t<Args...> fmt, Args &&...args) {
222		log(level::err, fmt, std::forward<Args>(args)...);
223		}
224
225		template <typename... Args>
226		void critical(wformat_string_t<Args...> fmt, Args &&...args) {
227		log(level::critical, fmt, std::forward<Args>(args)...);
228		}
229		#endif
230
231		template <typename T>
232		void trace(const T &msg) {
233		log(level::trace, msg);
234		}
235
236		template <typename T>
237		void debug(const T &msg) {
238		log(level::debug, msg);
239		}
240
241		template <typename T>
242		void info(const T &msg) {
243		log(level::info, msg);
244		}
245
246		template <typename T>
247		void warn(const T &msg) {
248		log(level::warn, msg);
249		}
250
251		template <typename T>
252		void error(const T &msg) {
253		log(level::err, msg);
254		}
255
256		template <typename T>
257		void critical(const T &msg) {
258		log(level::critical, msg);
259		}
260
261		// return true if logging is enabled for the given level.
262	9.06k	bool should_log(level::level_enum msg_level) const {
263	9.06k	return msg_level >= level_.load(std::memory_order_relaxed);
264	9.06k	}
265
266		// return true if backtrace logging is enabled.
267	0	bool should_backtrace() const { return tracer_.enabled(); }
268
269		void set_level(level::level_enum log_level);
270
271		level::level_enum level() const;
272
273		const std::string &name() const;
274
275		// set formatting for the sinks in this logger.
276		// each sink will get a separate instance of the formatter object.
277		void set_formatter(std::unique_ptr<formatter> f);
278
279		// set formatting for the sinks in this logger.
280		// equivalent to
281		// set_formatter(make_unique<pattern_formatter>(pattern, time_type))
282		// Note: each sink will get a new instance of a formatter object, replacing the old one.
283		void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local);
284
285		// backtrace support.
286		// efficiently store all debug/trace messages in a circular buffer until needed for debugging.
287		void enable_backtrace(size_t n_messages);
288		void disable_backtrace();
289		void dump_backtrace();
290
291		// flush functions
292		void flush();
293		void flush_on(level::level_enum log_level);
294		level::level_enum flush_level() const;
295
296		// sinks
297		const std::vector<sink_ptr> &sinks() const;
298
299		std::vector<sink_ptr> &sinks();
300
301		// error handler
302		void set_error_handler(err_handler);
303
304		// create new logger with same sinks and configuration.
305		virtual std::shared_ptr<logger> clone(std::string logger_name);
306
307		protected:
308		std::string name_;
309		std::vector<sink_ptr> sinks_;
310		spdlog::level_t level_{level::info};
311		spdlog::level_t flush_level_{level::off};
312		err_handler custom_err_handler_{nullptr};
313		details::backtracer tracer_;
314
315		// common implementation for after templated public api has been resolved
316		template <typename... Args>
317	9.06k	void log_(source_loc loc, level::level_enum lvl, string_view_t fmt, Args &&...args) {
318	9.06k	bool log_enabled = should_log(lvl);
319	9.06k	bool traceback_enabled = tracer_.enabled();
320	9.06k	if (!log_enabled && !traceback_enabled) {
321	1.81k	return;
322	1.81k	}
323	7.24k	SPDLOG_TRY {
324	7.24k	memory_buf_t buf;
325		#ifdef SPDLOG_USE_STD_FORMAT
326		fmt_lib::vformat_to(std::back_inserter(buf), fmt, fmt_lib::make_format_args(args...));
327		#else
328	7.24k	fmt::vformat_to(fmt::appender(buf), fmt, fmt::make_format_args(args...));
329	7.24k	#endif
330
331	7.24k	details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
332	7.24k	log_it_(log_msg, log_enabled, traceback_enabled);
333	7.24k	}
334	7.24k	SPDLOG_LOGGER_CATCH(loc)
335	7.24k	}
336
337		#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
338		template <typename... Args>
339		void log_(source_loc loc, level::level_enum lvl, wstring_view_t fmt, Args &&...args) {
340		bool log_enabled = should_log(lvl);
341		bool traceback_enabled = tracer_.enabled();
342		if (!log_enabled && !traceback_enabled) {
343		return;
344		}
345		SPDLOG_TRY {
346		// format to wmemory_buffer and convert to utf8
347		wmemory_buf_t wbuf;
348		fmt_lib::vformat_to(std::back_inserter(wbuf), fmt,
349		fmt_lib::make_format_args<fmt_lib::wformat_context>(args...));
350
351		memory_buf_t buf;
352		details::os::wstr_to_utf8buf(wstring_view_t(wbuf.data(), wbuf.size()), buf);
353		details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
354		log_it_(log_msg, log_enabled, traceback_enabled);
355		}
356		SPDLOG_LOGGER_CATCH(loc)
357		}
358		#endif // SPDLOG_WCHAR_TO_UTF8_SUPPORT
359
360		// log the given message (if the given log level is high enough),
361		// and save backtrace (if backtrace is enabled).
362		void log_it_(const details::log_msg &log_msg, bool log_enabled, bool traceback_enabled);
363		virtual void sink_it_(const details::log_msg &msg);
364		virtual void flush_();
365		void dump_backtrace_();
366		bool should_flush_(const details::log_msg &msg) const;
367
368		// handle errors during logging.
369		// default handler prints the error to stderr at max rate of 1 message/sec.
370		void err_handler_(const std::string &msg) const;
371		};
372
373		void swap(logger &a, logger &b) noexcept;
374
375		} // namespace spdlog
376
377		#ifdef SPDLOG_HEADER_ONLY
378		#include "logger-inl.h"
379		#endif