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Add example how to replace default logger. #2194

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Nov 28, 2021
Merged

Add example how to replace default logger. #2194

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14 changes: 14 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -391,6 +391,20 @@ void file_events_example()
}
```

---
#### Replace the Default Logger
```c++
void replace_default_logger_example()
{
auto new_logger = spdlog::basic_logger_mt("new_default_logger", "logs/new-default-log.txt", true);
spdlog::set_default_logger(new_logger);
spdlog::set_level(spdlog::level::info);
spdlog::debug("This message should not be displayed!");
spdlog::set_level(spdlog::level::trace);
spdlog::debug("This message should be displayed..");
}
```

---
## Benchmarks

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18 changes: 18 additions & 0 deletions example/example.cpp
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Expand Up @@ -23,6 +23,7 @@ void syslog_example();
void udp_example();
void custom_flags_example();
void file_events_example();
void replace_default_logger_example();

#include "spdlog/spdlog.h"
#include "spdlog/cfg/env.h" // support for loading levels from the environment variable
Expand Down Expand Up @@ -80,6 +81,7 @@ int main(int, char *[])
udp_example();
custom_flags_example();
file_events_example();
replace_default_logger_example();

// Flush all *registered* loggers using a worker thread every 3 seconds.
// note: registered loggers *must* be thread safe for this to work correctly!
Expand Down Expand Up @@ -326,3 +328,19 @@ void file_events_example()
spdlog::logger my_logger("some_logger", file_sink);
my_logger.info("Some log line");
}

void replace_default_logger_example()
{
// store the old logger so we don't break other examples.
auto old_logger = spdlog::default_logger();

auto new_logger = spdlog::basic_logger_mt("new_default_logger", "logs/new-default-log.txt", true);
spdlog::set_default_logger(new_logger);
spdlog::set_level(spdlog::level::info);
spdlog::debug("This message should not be displayed!");
spdlog::set_level(spdlog::level::trace);
spdlog::debug("This message should be displayed..");

spdlog::set_default_logger(old_logger);
}