--- /dev/null
+#include <msp/io/print.h>
+#include "logger.h"
+
+using namespace std;
+using namespace Msp;
+
+void Logger::enable_channel(const string &chan)
+{
+ enabled_channels.insert(chan);
+}
+
+void Logger::disable_channel(const string &chan)
+{
+ enabled_channels.erase(chan);
+}
+
+void Logger::log(const string &chan, const string &message) const
+{
+ if(enabled_channels.count(chan))
+ IO::print("%s\n", message);
+}