AMDG Vladimir Prus wrote:
There's another thing about component/severity logging that I have apparently forgot about -- filtering. It is surely necessary to change filtered components dynamically -- either while the application is running, or between runs, therefore lambda expression that compares to a fixed string will not be enough -- we need a lookup in a map. It's not obvious to me how to form a lambda expression to do a lookup in a map using the library, e.g. something like:
enabled_components.count(attr<string>("Component"))
So I wonder:
1. What is the actual syntax to do this inside lambda expression.
There is no simple syntax for it. (The lambda functionality is rather crippled compared to a real lambda library.) You could probably do it with boost::bind and the satisfies function. Also, this by itself would be dangerous, since filters need to be thread safe.
2. Can we implement a more convenient out-of-box mechanism. For example:
logging::core()->enabled_components().add("c1")
where this automatically affects the "Component" attribute.
In Christ, Steven Watanabe