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loguru.hpp
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loguru.hpp
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/*
Loguru logging library for C++, by Emil Ernerfeldt.
www.github.com/emilk/loguru
If you find Loguru useful, please let me know on twitter or in a mail!
Twitter: @ernerfeldt
Mail: [email protected]
Website: www.ilikebigbits.com
# License
This software is in the public domain. Where that dedication is not
recognized, you are granted a perpetual, irrevocable license to
copy, modify and distribute it as you see fit.
# Inspiration
Much of Loguru was inspired by GLOG, https://code.google.com/p/google-glog/.
The choice of public domain is fully due Sean T. Barrett
and his wonderful stb libraries at https://github.com/nothings/stb.
# Version history
* Version 0.1.0 - 2015-03-22 - Works great on Mac.
* Version 0.2.0 - 2015-09-17 - Removed the only dependency.
* Version 0.3.0 - 2015-10-02 - Drop-in replacement for most of GLOG
* Version 0.4.0 - 2015-10-07 - Single-file!
* Version 0.5.0 - 2015-10-17 - Improved file logging
* Version 0.6.0 - 2015-10-24 - Add stack traces
* Version 0.7.0 - 2015-10-27 - Signals
* Version 0.8.0 - 2015-10-30 - Color logging.
* Version 0.9.0 - 2015-11-26 - ABORT_S and proper handling of FATAL
* Version 1.0.0 - 2016-02-14 - ERROR_CONTEXT
* Version 1.1.0 - 2016-02-19 - -v OFF, -v INFO etc
* Version 1.1.1 - 2016-02-20 - textprintf vs strprintf
* Version 1.1.2 - 2016-02-22 - Remove g_alsologtostderr
* Version 1.1.3 - 2016-02-29 - ERROR_CONTEXT as linked list
* Version 1.2.0 - 2016-03-19 - Add get_thread_name()
* Version 1.2.1 - 2016-03-20 - Minor fixes
* Version 1.2.2 - 2016-03-29 - Fix issues with set_fatal_handler throwing an exception
* Version 1.2.3 - 2016-05-16 - Log current working directory in loguru::init().
* Version 1.2.4 - 2016-05-18 - Custom replacement for -v in loguru::init() by bjoernpollex
* Version 1.2.5 - 2016-05-18 - Add ability to print ERROR_CONTEXT of parent thread.
* Version 1.2.6 - 2016-05-19 - Bug fix regarding VLOG verbosity argument lacking ().
* Version 1.2.7 - 2016-05-23 - Fix PATH_MAX problem.
* Version 1.2.8 - 2016-05-26 - Add shutdown() and remove_all_callbacks()
* Version 1.2.9 - 2016-06-09 - Use a monotonic clock for uptime.
* Version 1.3.0 - 2016-07-20 - Fix issues with callback flush/close not being called.
* Version 1.3.1 - 2016-07-20 - Add LOGURU_UNSAFE_SIGNAL_HANDLER to toggle stacktrace on signals.
* Version 1.3.2 - 2016-07-20 - Add loguru::arguments()
* Version 1.4.0 - 2016-09-15 - Semantic versioning + add loguru::create_directories
* Version 1.4.1 - 2016-09-29 - Customize formating with LOGURU_FILENAME_WIDTH
* Version 1.5.0 - 2016-12-22 - LOGURU_USE_FMTLIB by kolis and LOGURU_WITH_FILEABS by scinart
* Version 1.5.1 - 2017-08-08 - Terminal colors on Windows 10 thanks to looki
* Version 1.6.0 - 2018-01-03 - Add LOGURU_RTTI and LOGURU_STACKTRACES settings
* Version 1.7.0 - 2018-01-03 - Add ability to turn off the preamble with loguru::g_preamble
* Version 1.7.1 - 2018-04-05 - Add function get_fatal_handler
* Version 1.7.2 - 2018-04-22 - Fix a bug where large file names could cause stack corruption (thanks @ccamporesi)
* Version 1.8.0 - 2018-04-23 - Shorten long file names to keep preamble fixed width
* Version 1.9.0 - 2018-09-22 - Adjust terminal colors, add LOGURU_VERBOSE_SCOPE_ENDINGS, add LOGURU_SCOPE_TIME_PRECISION, add named log levels
* Version 2.0.0 - 2018-09-22 - Split loguru.hpp into loguru.hpp and loguru.cpp
* Version 2.1.0 - 2019-09-23 - Update fmtlib + add option to loguru::init to NOT set main thread name.
# Compiling
Just include <loguru.hpp> where you want to use Loguru.
Then, in one .cpp file #include <loguru.cpp>
Make sure you compile with -std=c++11 -lstdc++ -lpthread -ldl
# Usage
For details, please see the official documentation at emilk.github.io/loguru
#include <loguru.hpp>
int main(int argc, char* argv[]) {
loguru::init(argc, argv);
// Put every log message in "everything.log":
loguru::add_file("everything.log", loguru::Append, loguru::Verbosity_MAX);
LOG_F(INFO, "The magic number is %d", 42);
}
*/
#if defined(LOGURU_IMPLEMENTATION)
#error "You are defining LOGURU_IMPLEMENTATION. This is for older versions of Loguru. You should now instead include loguru.cpp (or build it and link with it)"
#endif
// Disable all warnings from gcc/clang:
#if defined(__clang__)
#pragma clang system_header
#elif defined(__GNUC__)
#pragma GCC system_header
#endif
#ifndef LOGURU_HAS_DECLARED_FORMAT_HEADER
#define LOGURU_HAS_DECLARED_FORMAT_HEADER
// Semantic versioning. Loguru version can be printed with printf("%d.%d.%d", LOGURU_VERSION_MAJOR, LOGURU_VERSION_MINOR, LOGURU_VERSION_PATCH);
#define LOGURU_VERSION_MAJOR 2
#define LOGURU_VERSION_MINOR 1
#define LOGURU_VERSION_PATCH 0
#if defined(_MSC_VER)
#include <sal.h> // Needed for _In_z_ etc annotations
#endif
// ----------------------------------------------------------------------------
#ifndef LOGURU_EXPORT
// Define to your project's export declaration if needed for use in a shared library.
#define LOGURU_EXPORT
#endif
#ifndef LOGURU_SCOPE_TEXT_SIZE
// Maximum length of text that can be printed by a LOG_SCOPE.
// This should be long enough to get most things, but short enough not to clutter the stack.
#define LOGURU_SCOPE_TEXT_SIZE 196
#endif
#ifndef LOGURU_FILENAME_WIDTH
// Width of the column containing the file name
#define LOGURU_FILENAME_WIDTH 23
#endif
#ifndef LOGURU_THREADNAME_WIDTH
// Width of the column containing the thread name
#define LOGURU_THREADNAME_WIDTH 16
#endif
#ifndef LOGURU_SCOPE_TIME_PRECISION
// Resolution of scope timers. 3=ms, 6=us, 9=ns
#define LOGURU_SCOPE_TIME_PRECISION 3
#endif
#ifndef LOGURU_CATCH_SIGABRT
// Should Loguru catch SIGABRT to print stack trace etc?
#define LOGURU_CATCH_SIGABRT 1
#endif
#ifndef LOGURU_VERBOSE_SCOPE_ENDINGS
// Show milliseconds and scope name at end of scope.
#define LOGURU_VERBOSE_SCOPE_ENDINGS 1
#endif
#ifndef LOGURU_REDEFINE_ASSERT
#define LOGURU_REDEFINE_ASSERT 0
#endif
#ifndef LOGURU_WITH_STREAMS
#define LOGURU_WITH_STREAMS 0
#endif
#ifndef LOGURU_REPLACE_GLOG
#define LOGURU_REPLACE_GLOG 0
#endif
#if LOGURU_REPLACE_GLOG
#undef LOGURU_WITH_STREAMS
#define LOGURU_WITH_STREAMS 1
#endif
#if defined(LOGURU_UNSAFE_SIGNAL_HANDLER)
#error "You are defining LOGURU_UNSAFE_SIGNAL_HANDLER. This is for older versions of Loguru. You should now instead set the unsafe_signal_handler option when you call loguru::init."
#endif
#if LOGURU_IMPLEMENTATION
#undef LOGURU_WITH_STREAMS
#define LOGURU_WITH_STREAMS 1
#endif
#ifndef LOGURU_USE_FMTLIB
#define LOGURU_USE_FMTLIB 0
#endif
#ifndef LOGURU_WITH_FILEABS
#define LOGURU_WITH_FILEABS 0
#endif
#ifndef LOGURU_RTTI
#if defined(__clang__)
#if __has_feature(cxx_rtti)
#define LOGURU_RTTI 1
#endif
#elif defined(__GNUG__)
#if defined(__GXX_RTTI)
#define LOGURU_RTTI 1
#endif
#elif defined(_MSC_VER)
#if defined(_CPPRTTI)
#define LOGURU_RTTI 1
#endif
#endif
#endif
// --------------------------------------------------------------------
// Utility macros
#define LOGURU_CONCATENATE_IMPL(s1, s2) s1 ## s2
#define LOGURU_CONCATENATE(s1, s2) LOGURU_CONCATENATE_IMPL(s1, s2)
#ifdef __COUNTER__
# define LOGURU_ANONYMOUS_VARIABLE(str) LOGURU_CONCATENATE(str, __COUNTER__)
#else
# define LOGURU_ANONYMOUS_VARIABLE(str) LOGURU_CONCATENATE(str, __LINE__)
#endif
#if defined(__clang__) || defined(__GNUC__)
// Helper macro for declaring functions as having similar signature to printf.
// This allows the compiler to catch format errors at compile-time.
#define LOGURU_PRINTF_LIKE(fmtarg, firstvararg) __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
#define LOGURU_FORMAT_STRING_TYPE const char*
#elif defined(_MSC_VER)
#define LOGURU_PRINTF_LIKE(fmtarg, firstvararg)
#define LOGURU_FORMAT_STRING_TYPE _In_z_ _Printf_format_string_ const char*
#else
#define LOGURU_PRINTF_LIKE(fmtarg, firstvararg)
#define LOGURU_FORMAT_STRING_TYPE const char*
#endif
// Used to mark log_and_abort for the benefit of the static analyzer and optimizer.
#if defined(_MSC_VER)
#define LOGURU_NORETURN __declspec(noreturn)
#else
#define LOGURU_NORETURN __attribute__((noreturn))
#endif
#if defined(_MSC_VER)
#define LOGURU_PREDICT_FALSE(x) (x)
#define LOGURU_PREDICT_TRUE(x) (x)
#else
#define LOGURU_PREDICT_FALSE(x) (__builtin_expect(x, 0))
#define LOGURU_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
#endif
#if LOGURU_USE_FMTLIB
#include <fmt/format.h>
#define LOGURU_FMT(x) "{:" #x "}"
#else
#define LOGURU_FMT(x) "%" #x
#endif
#ifdef _WIN32
#define STRDUP(str) _strdup(str)
#else
#define STRDUP(str) strdup(str)
#endif
// --------------------------------------------------------------------
namespace loguru
{
// Simple RAII ownership of a char*.
class LOGURU_EXPORT Text
{
public:
explicit Text(char* owned_str) : _str(owned_str) {}
~Text();
Text(Text&& t)
{
_str = t._str;
t._str = nullptr;
}
Text(Text& t) = delete;
Text& operator=(Text& t) = delete;
void operator=(Text&& t) = delete;
const char* c_str() const { return _str; }
bool empty() const { return _str == nullptr || *_str == '\0'; }
char* release()
{
auto result = _str;
_str = nullptr;
return result;
}
private:
char* _str;
};
// Like printf, but returns the formated text.
#if LOGURU_USE_FMTLIB
LOGURU_EXPORT
Text vtextprintf(const char* format, fmt::format_args args);
template<typename... Args>
LOGURU_EXPORT
Text textprintf(LOGURU_FORMAT_STRING_TYPE format, const Args&... args) {
return vtextprintf(format, fmt::make_format_args(args...));
}
#else
LOGURU_EXPORT
Text textprintf(LOGURU_FORMAT_STRING_TYPE format, ...) LOGURU_PRINTF_LIKE(1, 2);
#endif
// Overloaded for variadic template matching.
LOGURU_EXPORT
Text textprintf();
using Verbosity = int;
#undef FATAL
#undef ERROR
#undef WARNING
#undef INFO
#undef MAX
enum NamedVerbosity : Verbosity
{
// Used to mark an invalid verbosity. Do not log to this level.
Verbosity_INVALID = -10, // Never do LOG_F(INVALID)
// You may use Verbosity_OFF on g_stderr_verbosity, but for nothing else!
Verbosity_OFF = -9, // Never do LOG_F(OFF)
// Prefer to use ABORT_F or ABORT_S over LOG_F(FATAL) or LOG_S(FATAL).
Verbosity_FATAL = -3,
Verbosity_ERROR = -2,
Verbosity_WARNING = -1,
// Normal messages. By default written to stderr.
Verbosity_INFO = 0,
// Same as Verbosity_INFO in every way.
Verbosity_0 = 0,
// Verbosity levels 1-9 are generally not written to stderr, but are written to file.
Verbosity_1 = +1,
Verbosity_2 = +2,
Verbosity_3 = +3,
Verbosity_4 = +4,
Verbosity_5 = +5,
Verbosity_6 = +6,
Verbosity_7 = +7,
Verbosity_8 = +8,
Verbosity_9 = +9,
// Don not use higher verbosity levels, as that will make grepping log files harder.
Verbosity_MAX = +9,
};
struct Message
{
// You would generally print a Message by just concating the buffers without spacing.
// Optionally, ignore preamble and indentation.
Verbosity verbosity; // Already part of preamble
const char* filename; // Already part of preamble
unsigned line; // Already part of preamble
const char* preamble; // Date, time, uptime, thread, file:line, verbosity.
const char* indentation; // Just a bunch of spacing.
const char* prefix; // Assertion failure info goes here (or "").
const char* message; // User message goes here.
};
/* Everything with a verbosity equal or greater than g_stderr_verbosity will be
written to stderr. You can set this in code or via the -v argument.
Set to loguru::Verbosity_OFF to write nothing to stderr.
Default is 0, i.e. only log ERROR, WARNING and INFO are written to stderr.
*/
LOGURU_EXPORT extern Verbosity g_stderr_verbosity;
LOGURU_EXPORT extern bool g_colorlogtostderr; // True by default.
LOGURU_EXPORT extern unsigned g_flush_interval_ms; // 0 (unbuffered) by default.
LOGURU_EXPORT extern bool g_preamble_header; // Prepend each log start by a descriptions line with all columns name? True by default.
LOGURU_EXPORT extern bool g_preamble; // Prefix each log line with date, time etc? True by default.
/* Specify the verbosity used by loguru to log its info messages including the header
logged when logged::init() is called or on exit. Default is 0 (INFO).
*/
LOGURU_EXPORT extern Verbosity g_internal_verbosity;
// Turn off individual parts of the preamble
LOGURU_EXPORT extern bool g_preamble_date; // The date field
LOGURU_EXPORT extern bool g_preamble_time; // The time of the current day
LOGURU_EXPORT extern bool g_preamble_uptime; // The time since init call
LOGURU_EXPORT extern bool g_preamble_thread; // The logging thread
LOGURU_EXPORT extern bool g_preamble_file; // The file from which the log originates from
LOGURU_EXPORT extern bool g_preamble_verbose; // The verbosity field
LOGURU_EXPORT extern bool g_preamble_pipe; // The pipe symbol right before the message
// May not throw!
typedef void (*log_handler_t)(void* user_data, const Message& message);
typedef void (*close_handler_t)(void* user_data);
typedef void (*flush_handler_t)(void* user_data);
// May throw if that's how you'd like to handle your errors.
typedef void (*fatal_handler_t)(const Message& message);
// Given a verbosity level, return the level's name or nullptr.
typedef const char* (*verbosity_to_name_t)(Verbosity verbosity);
// Given a verbosity level name, return the verbosity level or
// Verbosity_INVALID if name is not recognized.
typedef Verbosity (*name_to_verbosity_t)(const char* name);
// Runtime options passed to loguru::init
struct Options
{
// This allows you to use something else instead of "-v" via verbosity_flag.
// Set to nullptr to if you don't want Loguru to parse verbosity from the args.'
const char* verbosity_flag = "-v";
// loguru::init will set the name of the calling thread to this.
// If you don't want Loguru to set the name of the main thread,
// set this to nullptr.
// NOTE: on SOME platforms loguru::init will only overwrite the thread name
// if a thread name has not already been set.
// To always set a thread name, use loguru::set_thread_name instead.
const char* main_thread_name = "main thread";
// Make Loguru try to do unsafe but useful things,
// like printing a stack trace, when catching signals.
// This may lead to bad things like deadlocks in certain situations.
bool unsafe_signal_handler = true;
};
/* Should be called from the main thread.
You don't *need* to call this, but if you do you get:
* Signal handlers installed
* Program arguments logged
* Working dir logged
* Optional -v verbosity flag parsed
* Main thread name set to "main thread"
* Explanation of the preamble (date, threanmae etc) logged
loguru::init() will look for arguments meant for loguru and remove them.
Arguments meant for loguru are:
-v n Set loguru::g_stderr_verbosity level. Examples:
-v 3 Show verbosity level 3 and lower.
-v 0 Only show INFO, WARNING, ERROR, FATAL (default).
-v INFO Only show INFO, WARNING, ERROR, FATAL (default).
-v WARNING Only show WARNING, ERROR, FATAL.
-v ERROR Only show ERROR, FATAL.
-v FATAL Only show FATAL.
-v OFF Turn off logging to stderr.
Tip: You can set g_stderr_verbosity before calling loguru::init.
That way you can set the default but have the user override it with the -v flag.
Note that -v does not affect file logging (see loguru::add_file).
You can you something other than the -v flag by setting the verbosity_flag option.
*/
LOGURU_EXPORT
void init(int& argc, char* argv[], const Options& options = {});
// Will call remove_all_callbacks(). After calling this, logging will still go to stderr.
// You generally don't need to call this.
LOGURU_EXPORT
void shutdown();
// What ~ will be replaced with, e.g. "/home/your_user_name/"
LOGURU_EXPORT
const char* home_dir();
/* Returns the name of the app as given in argv[0] but without leading path.
That is, if argv[0] is "../foo/app" this will return "app".
*/
LOGURU_EXPORT
const char* argv0_filename();
// Returns all arguments given to loguru::init(), but escaped with a single space as separator.
LOGURU_EXPORT
const char* arguments();
// Returns the path to the current working dir when loguru::init() was called.
LOGURU_EXPORT
const char* current_dir();
// Returns the part of the path after the last / or \ (if any).
LOGURU_EXPORT
const char* filename(const char* path);
// e.g. "foo/bar/baz.ext" will create the directories "foo/" and "foo/bar/"
LOGURU_EXPORT
bool create_directories(const char* file_path_const);
// Writes date and time with millisecond precision, e.g. "20151017_161503.123"
LOGURU_EXPORT
void write_date_time(char* buff, unsigned buff_size);
// Helper: thread-safe version strerror
LOGURU_EXPORT
Text errno_as_text();
/* Given a prefix of e.g. "~/loguru/" this might return
"/home/your_username/loguru/app_name/20151017_161503.123.log"
where "app_name" is a sanitized version of argv[0].
*/
LOGURU_EXPORT
void suggest_log_path(const char* prefix, char* buff, unsigned buff_size);
enum FileMode { Truncate, Append };
/* Will log to a file at the given path.
Any logging message with a verbosity lower or equal to
the given verbosity will be included.
The function will create all directories in 'path' if needed.
If path starts with a ~, it will be replaced with loguru::home_dir()
To stop the file logging, just call loguru::remove_callback(path) with the same path.
*/
LOGURU_EXPORT
bool add_file(const char* path, FileMode mode, Verbosity verbosity);
/* Will be called right before abort().
You can for instance use this to print custom error messages, or throw an exception.
Feel free to call LOG:ing function from this, but not FATAL ones! */
LOGURU_EXPORT
void set_fatal_handler(fatal_handler_t handler);
// Get the current fatal handler, if any. Default value is nullptr.
LOGURU_EXPORT
fatal_handler_t get_fatal_handler();
/* Will be called on each log messages with a verbosity less or equal to the given one.
Useful for displaying messages on-screen in a game, for example.
The given on_close is also expected to flush (if desired).
*/
LOGURU_EXPORT
void add_callback(
const char* id,
log_handler_t callback,
void* user_data,
Verbosity verbosity,
close_handler_t on_close = nullptr,
flush_handler_t on_flush = nullptr);
/* Set a callback that returns custom verbosity level names. If callback
is nullptr or returns nullptr, default log names will be used.
*/
LOGURU_EXPORT
void set_verbosity_to_name_callback(verbosity_to_name_t callback);
/* Set a callback that returns the verbosity level matching a name. The
callback should return Verbosity_INVALID if the name is not
recognized.
*/
LOGURU_EXPORT
void set_name_to_verbosity_callback(name_to_verbosity_t callback);
/* Get a custom name for a specific verbosity, if one exists, or nullptr. */
LOGURU_EXPORT
const char* get_verbosity_name(Verbosity verbosity);
/* Get the verbosity enum value from a custom 4-character level name, if one exists.
If the name does not match a custom level name, Verbosity_INVALID is returned.
*/
LOGURU_EXPORT
Verbosity get_verbosity_from_name(const char* name);
// Returns true iff the callback was found (and removed).
LOGURU_EXPORT
bool remove_callback(const char* id);
// Shut down all file logging and any other callback hooks installed.
LOGURU_EXPORT
void remove_all_callbacks();
// Returns the maximum of g_stderr_verbosity and all file/custom outputs.
LOGURU_EXPORT
Verbosity current_verbosity_cutoff();
#if LOGURU_USE_FMTLIB
// Internal functions
void vlog(Verbosity verbosity, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, fmt::format_args args);
void raw_vlog(Verbosity verbosity, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, fmt::format_args args);
// Actual logging function. Use the LOG macro instead of calling this directly.
template <typename... Args>
LOGURU_EXPORT
void log(Verbosity verbosity, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, const Args &... args) {
vlog(verbosity, file, line, format, fmt::make_format_args(args...));
}
// Log without any preamble or indentation.
template <typename... Args>
LOGURU_EXPORT
void raw_log(Verbosity verbosity, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, const Args &... args) {
raw_vlog(verbosity, file, line, format, fmt::make_format_args(args...));
}
#else // LOGURU_USE_FMTLIB?
// Actual logging function. Use the LOG macro instead of calling this directly.
LOGURU_EXPORT
void log(Verbosity verbosity, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, ...) LOGURU_PRINTF_LIKE(4, 5);
// Log without any preamble or indentation.
LOGURU_EXPORT
void raw_log(Verbosity verbosity, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, ...) LOGURU_PRINTF_LIKE(4, 5);
#endif // !LOGURU_USE_FMTLIB
// Helper class for LOG_SCOPE_F
class LOGURU_EXPORT LogScopeRAII
{
public:
LogScopeRAII() : _file(nullptr) {} // No logging
LogScopeRAII(Verbosity verbosity, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, ...) LOGURU_PRINTF_LIKE(5, 6);
~LogScopeRAII();
#if defined(_MSC_VER) && _MSC_VER > 1800
// older MSVC default move ctors close the scope on move. See
// issue #43
LogScopeRAII(LogScopeRAII&& other)
: _verbosity(other._verbosity)
, _file(other._file)
, _line(other._line)
, _indent_stderr(other._indent_stderr)
, _start_time_ns(other._start_time_ns)
{
// Make sure the tmp object's destruction doesn't close the scope:
other._file = nullptr;
for (unsigned int i = 0; i < LOGURU_SCOPE_TEXT_SIZE; ++i) {
_name[i] = other._name[i];
}
}
#else
LogScopeRAII(LogScopeRAII&&) = default;
#endif
private:
LogScopeRAII(const LogScopeRAII&) = delete;
LogScopeRAII& operator=(const LogScopeRAII&) = delete;
void operator=(LogScopeRAII&&) = delete;
Verbosity _verbosity;
const char* _file; // Set to null if we are disabled due to verbosity
unsigned _line;
bool _indent_stderr; // Did we?
long long _start_time_ns;
char _name[LOGURU_SCOPE_TEXT_SIZE];
};
// Marked as 'noreturn' for the benefit of the static analyzer and optimizer.
// stack_trace_skip is the number of extrace stack frames to skip above log_and_abort.
#if LOGURU_USE_FMTLIB
LOGURU_EXPORT
LOGURU_NORETURN void vlog_and_abort(int stack_trace_skip, const char* expr, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, fmt::format_args);
template <typename... Args>
LOGURU_EXPORT
LOGURU_NORETURN void log_and_abort(int stack_trace_skip, const char* expr, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, const Args&... args) {
vlog_and_abort(stack_trace_skip, expr, file, line, format, fmt::make_format_args(args...));
}
#else
LOGURU_EXPORT
LOGURU_NORETURN void log_and_abort(int stack_trace_skip, const char* expr, const char* file, unsigned line, LOGURU_FORMAT_STRING_TYPE format, ...) LOGURU_PRINTF_LIKE(5, 6);
#endif
LOGURU_EXPORT
LOGURU_NORETURN void log_and_abort(int stack_trace_skip, const char* expr, const char* file, unsigned line);
// Flush output to stderr and files.
// If g_flush_interval_ms is set to non-zero, this will be called automatically this often.
// If not set, you do not need to call this at all.
LOGURU_EXPORT
void flush();
template<class T> inline Text format_value(const T&) { return textprintf("N/A"); }
template<> inline Text format_value(const char& v) { return textprintf(LOGURU_FMT(c), v); }
template<> inline Text format_value(const int& v) { return textprintf(LOGURU_FMT(d), v); }
template<> inline Text format_value(const unsigned int& v) { return textprintf(LOGURU_FMT(u), v); }
template<> inline Text format_value(const long& v) { return textprintf(LOGURU_FMT(lu), v); }
template<> inline Text format_value(const unsigned long& v) { return textprintf(LOGURU_FMT(ld), v); }
template<> inline Text format_value(const long long& v) { return textprintf(LOGURU_FMT(llu), v); }
template<> inline Text format_value(const unsigned long long& v) { return textprintf(LOGURU_FMT(lld), v); }
template<> inline Text format_value(const float& v) { return textprintf(LOGURU_FMT(f), v); }
template<> inline Text format_value(const double& v) { return textprintf(LOGURU_FMT(f), v); }
/* Thread names can be set for the benefit of readable logs.
If you do not set the thread name, a hex id will be shown instead.
These thread names may or may not be the same as the system thread names,
depending on the system.
Try to limit the thread name to 15 characters or less. */
LOGURU_EXPORT
void set_thread_name(const char* name);
/* Returns the thread name for this thread.
On OSX this will return the system thread name (settable from both within and without Loguru).
On other systems it will return whatever you set in set_thread_name();
If no thread name is set, this will return a hexadecimal thread id.
length should be the number of bytes available in the buffer.
17 is a good number for length.
right_align_hext_id means any hexadecimal thread id will be written to the end of buffer.
*/
LOGURU_EXPORT
void get_thread_name(char* buffer, unsigned long long length, bool right_align_hext_id);
/* Generates a readable stacktrace as a string.
'skip' specifies how many stack frames to skip.
For instance, the default skip (1) means:
don't include the call to loguru::stacktrace in the stack trace. */
LOGURU_EXPORT
Text stacktrace(int skip = 1);
/* Add a string to be replaced with something else in the stack output.
For instance, instead of having a stack trace look like this:
0x41f541 some_function(std::basic_ofstream<char, std::char_traits<char> >&)
You can clean it up with:
auto verbose_type_name = loguru::demangle(typeid(std::ofstream).name());
loguru::add_stack_cleanup(verbose_type_name.c_str(); "std::ofstream");
So the next time you will instead see:
0x41f541 some_function(std::ofstream&)
`replace_with_this` must be shorter than `find_this`.
*/
LOGURU_EXPORT
void add_stack_cleanup(const char* find_this, const char* replace_with_this);
// Example: demangle(typeid(std::ofstream).name()) -> "std::basic_ofstream<char, std::char_traits<char> >"
LOGURU_EXPORT
Text demangle(const char* name);
// ------------------------------------------------------------------------
/*
Not all terminals support colors, but if they do, and g_colorlogtostderr
is set, Loguru will write them to stderr to make errors in red, etc.
You also have the option to manually use them, via the function below.
Note, however, that if you do, the color codes could end up in your logfile!
This means if you intend to use them functions you should either:
* Use them on the stderr/stdout directly (bypass Loguru).
* Don't add file outputs to Loguru.
* Expect some \e[1m things in your logfile.
Usage:
printf("%sRed%sGreen%sBold green%sClear again\n",
loguru::terminal_red(), loguru::terminal_green(),
loguru::terminal_bold(), loguru::terminal_reset());
If the terminal at hand does not support colors the above output
will just not have funky \e[1m things showing.
*/
// Do the output terminal support colors?
LOGURU_EXPORT
bool terminal_has_color();
// Colors
LOGURU_EXPORT const char* terminal_black();
LOGURU_EXPORT const char* terminal_red();
LOGURU_EXPORT const char* terminal_green();
LOGURU_EXPORT const char* terminal_yellow();
LOGURU_EXPORT const char* terminal_blue();
LOGURU_EXPORT const char* terminal_purple();
LOGURU_EXPORT const char* terminal_cyan();
LOGURU_EXPORT const char* terminal_light_gray();
LOGURU_EXPORT const char* terminal_light_red();
LOGURU_EXPORT const char* terminal_white();
// Formating
LOGURU_EXPORT const char* terminal_bold();
LOGURU_EXPORT const char* terminal_underline();
// You should end each line with this!
LOGURU_EXPORT const char* terminal_reset();
// --------------------------------------------------------------------
// Error context related:
struct StringStream;
// Use this in your EcEntryBase::print_value overload.
LOGURU_EXPORT
void stream_print(StringStream& out_string_stream, const char* text);
class LOGURU_EXPORT EcEntryBase
{
public:
EcEntryBase(const char* file, unsigned line, const char* descr);
~EcEntryBase();
EcEntryBase(const EcEntryBase&) = delete;
EcEntryBase(EcEntryBase&&) = delete;
EcEntryBase& operator=(const EcEntryBase&) = delete;
EcEntryBase& operator=(EcEntryBase&&) = delete;
virtual void print_value(StringStream& out_string_stream) const = 0;
EcEntryBase* previous() const { return _previous; }
// private:
const char* _file;
unsigned _line;
const char* _descr;
EcEntryBase* _previous;
};
template<typename T>
class EcEntryData : public EcEntryBase
{
public:
using Printer = Text(*)(T data);
EcEntryData(const char* file, unsigned line, const char* descr, T data, Printer&& printer)
: EcEntryBase(file, line, descr), _data(data), _printer(printer) {}
virtual void print_value(StringStream& out_string_stream) const override
{
const auto str = _printer(_data);
stream_print(out_string_stream, str.c_str());
}
private:
T _data;
Printer _printer;
};
// template<typename Printer>
// class EcEntryLambda : public EcEntryBase
// {
// public:
// EcEntryLambda(const char* file, unsigned line, const char* descr, Printer&& printer)
// : EcEntryBase(file, line, descr), _printer(std::move(printer)) {}
// virtual void print_value(StringStream& out_string_stream) const override
// {
// const auto str = _printer();
// stream_print(out_string_stream, str.c_str());
// }
// private:
// Printer _printer;
// };
// template<typename Printer>
// EcEntryLambda<Printer> make_ec_entry_lambda(const char* file, unsigned line, const char* descr, Printer&& printer)
// {
// return {file, line, descr, std::move(printer)};
// }
template <class T>
struct decay_char_array { using type = T; };
template <unsigned long long N>
struct decay_char_array<const char(&)[N]> { using type = const char*; };
template <class T>
struct make_const_ptr { using type = T; };
template <class T>
struct make_const_ptr<T*> { using type = const T*; };
template <class T>
struct make_ec_type { using type = typename make_const_ptr<typename decay_char_array<T>::type>::type; };
/* A stack trace gives you the names of the function at the point of a crash.
With ERROR_CONTEXT, you can also get the values of select local variables.
Usage:
void process_customers(const std::string& filename)
{
ERROR_CONTEXT("Processing file", filename.c_str());
for (int customer_index : ...)
{
ERROR_CONTEXT("Customer index", customer_index);
...
}
}
The context is in effect during the scope of the ERROR_CONTEXT.
Use loguru::get_error_context() to get the contents of the active error contexts.
Example result:
------------------------------------------------
[ErrorContext] main.cpp:416 Processing file: "customers.json"
[ErrorContext] main.cpp:417 Customer index: 42
------------------------------------------------
Error contexts are printed automatically on crashes, and only on crashes.
This makes them much faster than logging the value of a variable.
*/
#define ERROR_CONTEXT(descr, data) \
const loguru::EcEntryData<loguru::make_ec_type<decltype(data)>::type> \
LOGURU_ANONYMOUS_VARIABLE(error_context_scope_)( \
__FILE__, __LINE__, descr, data, \
static_cast<loguru::EcEntryData<loguru::make_ec_type<decltype(data)>::type>::Printer>(loguru::ec_to_text) ) // For better error messages
/*
#define ERROR_CONTEXT(descr, data) \
const auto LOGURU_ANONYMOUS_VARIABLE(error_context_scope_)( \
loguru::make_ec_entry_lambda(__FILE__, __LINE__, descr, \
[=](){ return loguru::ec_to_text(data); }))
*/
using EcHandle = const EcEntryBase*;
/*
Get a light-weight handle to the error context stack on this thread.
The handle is valid as long as the current thread has no changes to its error context stack.
You can pass the handle to loguru::get_error_context on another thread.
This can be very useful for when you have a parent thread spawning several working threads,
and you want the error context of the parent thread to get printed (too) when there is an
error on the child thread. You can accomplish this thusly:
void foo(const char* parameter)
{
ERROR_CONTEXT("parameter", parameter)
const auto parent_ec_handle = loguru::get_thread_ec_handle();
std::thread([=]{
loguru::set_thread_name("child thread");
ERROR_CONTEXT("parent context", parent_ec_handle);
dangerous_code();
}.join();
}
*/
LOGURU_EXPORT
EcHandle get_thread_ec_handle();
// Get a string describing the current stack of error context. Empty string if there is none.
LOGURU_EXPORT
Text get_error_context();
// Get a string describing the error context of the given thread handle.
LOGURU_EXPORT
Text get_error_context_for(EcHandle ec_handle);
// ------------------------------------------------------------------------
LOGURU_EXPORT Text ec_to_text(const char* data);
LOGURU_EXPORT Text ec_to_text(char data);
LOGURU_EXPORT Text ec_to_text(int data);
LOGURU_EXPORT Text ec_to_text(unsigned int data);
LOGURU_EXPORT Text ec_to_text(long data);
LOGURU_EXPORT Text ec_to_text(unsigned long data);
LOGURU_EXPORT Text ec_to_text(long long data);
LOGURU_EXPORT Text ec_to_text(unsigned long long data);
LOGURU_EXPORT Text ec_to_text(float data);
LOGURU_EXPORT Text ec_to_text(double data);
LOGURU_EXPORT Text ec_to_text(long double data);
LOGURU_EXPORT Text ec_to_text(EcHandle);
/*
You can add ERROR_CONTEXT support for your own types by overloading ec_to_text. Here's how:
some.hpp:
namespace loguru {
Text ec_to_text(MySmallType data)
Text ec_to_text(const MyBigType* data)
} // namespace loguru
some.cpp:
namespace loguru {
Text ec_to_text(MySmallType small_value)
{
// Called only when needed, i.e. on a crash.
std::string str = small_value.as_string(); // Format 'small_value' here somehow.
return Text{STRDUP(str.c_str())};
}
Text ec_to_text(const MyBigType* big_value)
{
// Called only when needed, i.e. on a crash.
std::string str = big_value->as_string(); // Format 'big_value' here somehow.
return Text{STRDUP(str.c_str())};
}
} // namespace loguru
Any file that include some.hpp:
void foo(MySmallType small, const MyBigType& big)
{
ERROR_CONTEXT("Small", small); // Copy ´small` by value.
ERROR_CONTEXT("Big", &big); // `big` should not change during this scope!
....
}
*/
} // namespace loguru
// --------------------------------------------------------------------
// Logging macros
// LOG_F(2, "Only logged if verbosity is 2 or higher: %d", some_number);
#define VLOG_F(verbosity, ...) \
((verbosity) > loguru::current_verbosity_cutoff()) ? (void)0 \
: loguru::log(verbosity, __FILE__, __LINE__, __VA_ARGS__)
// LOG_F(INFO, "Foo: %d", some_number);
#define LOG_F(verbosity_name, ...) VLOG_F(loguru::Verbosity_ ## verbosity_name, __VA_ARGS__)
#define VLOG_IF_F(verbosity, cond, ...) \
((verbosity) > loguru::current_verbosity_cutoff() || (cond) == false) \
? (void)0 \
: loguru::log(verbosity, __FILE__, __LINE__, __VA_ARGS__)
#define LOG_IF_F(verbosity_name, cond, ...) \
VLOG_IF_F(loguru::Verbosity_ ## verbosity_name, cond, __VA_ARGS__)
#define VLOG_SCOPE_F(verbosity, ...) \
loguru::LogScopeRAII LOGURU_ANONYMOUS_VARIABLE(error_context_RAII_) = \
((verbosity) > loguru::current_verbosity_cutoff()) ? loguru::LogScopeRAII() : \
loguru::LogScopeRAII(verbosity, __FILE__, __LINE__, __VA_ARGS__)
// Raw logging - no preamble, no indentation. Slightly faster than full logging.
#define RAW_VLOG_F(verbosity, ...) \
((verbosity) > loguru::current_verbosity_cutoff()) ? (void)0 \
: loguru::raw_log(verbosity, __FILE__, __LINE__, __VA_ARGS__)
#define RAW_LOG_F(verbosity_name, ...) RAW_VLOG_F(loguru::Verbosity_ ## verbosity_name, __VA_ARGS__)
// Use to book-end a scope. Affects logging on all threads.
#define LOG_SCOPE_F(verbosity_name, ...) \
VLOG_SCOPE_F(loguru::Verbosity_ ## verbosity_name, __VA_ARGS__)