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Add example to replace default logger.

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Close #2193
This commit is contained in:
Sean Farrell
2021-11-28 13:55:14 +01:00
parent e1a4b28039
commit f52d526e1e
2 changed files with 32 additions and 0 deletions
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14
README.md
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@@ -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 ## Benchmarks

18
example/example.cpp
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@@ -23,6 +23,7 @@ void syslog_example();
void udp_example(); void udp_example();
void custom_flags_example(); void custom_flags_example();
void file_events_example(); void file_events_example();
void replace_default_logger_example();
#include "spdlog/spdlog.h" #include "spdlog/spdlog.h"
#include "spdlog/cfg/env.h" // support for loading levels from the environment variable #include "spdlog/cfg/env.h" // support for loading levels from the environment variable
@@ -80,6 +81,7 @@ int main(int, char *[])
udp_example(); udp_example();
custom_flags_example(); custom_flags_example();
file_events_example(); file_events_example();
replace_default_logger_example();
// Flush all *registered* loggers using a worker thread every 3 seconds. // Flush all *registered* loggers using a worker thread every 3 seconds.
// note: registered loggers *must* be thread safe for this to work correctly! // note: registered loggers *must* be thread safe for this to work correctly!
@@ -326,3 +328,19 @@ void file_events_example()
spdlog::logger my_logger("some_logger", file_sink); spdlog::logger my_logger("some_logger", file_sink);
my_logger.info("Some log line"); 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);
}