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Update README.md (#3437)

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* Update README.md

add example showcasing 2 loggers and `spdlog::set_level()` 
which set level not only to default logger, but to all registed loggers

* Update README.md

* simplify

* simplify
This commit is contained in:
Alexander
2025-07-16 08:59:51 +03:00
committed by GitHub
parent 4397dac510
commit 4f2b3d52f9
1 changed files with 25 additions and 2 deletions
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README.md
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@@ -80,7 +80,7 @@ int main()
spdlog::info("Positional args are {1} {0}..", "too", "supported"); spdlog::info("Positional args are {1} {0}..", "too", "supported");
spdlog::info("{:<30}", "left aligned"); spdlog::info("{:<30}", "left aligned");
spdlog::set_level(spdlog::level::debug); // Set global log level to debug spdlog::set_level(spdlog::level::debug); // Set *global* log level to debug
spdlog::debug("This message should be displayed.."); spdlog::debug("This message should be displayed..");
// change log pattern // change log pattern
@@ -241,6 +241,29 @@ void multi_sink_example()
} }
``` ```
---
#### Register several loggers - change global level
```c++
// Creation of loggers. Set levels to all registered loggers.
void set_level_example()
{
auto logger1 = spdlog::basic_logger_mt("logger1", "logs/logger1.txt");
auto logger2 = spdlog::basic_logger_mt("logger2", "logs/logger2.txt");
spdlog::set_default_logger(logger2);
spdlog::default_logger()->set_level(spdlog::level::trace); // set level for the default logger (logger2) to trace
spdlog::trace("trace message to the logger2 (specified as default)");
spdlog::set_level(spdlog::level::off) // (sic!) set level for *all* registered loggers to off (disable)
logger1.warn("warn message will not appear because the level set to off");
logger2.warn("warn message will not appear because the level set to off");
spdlog::warn("warn message will not appear because the level set to off");
}
```
--- ---
#### User-defined callbacks about log events #### User-defined callbacks about log events
```c++ ```c++