satlog.rs: Simple logger for SAT-like solvers

This outputs logs to stdout as DIMACS comments:

c WARN: ...
c ERR: ...

For Level::Info messages, the level is not printed: this allows to have a quiet mode for the solver by setting the level filter to LevelFilter::Off.

Example usage

use satlog::SatLogger;
use log::LevelFilter;

fn main() {
    SatLogger::init(LevelFilter::Info);
}