added logging module and a sandbox project

source/core/logger/logger.cpp

@@ -0,0 +1,34 @@
+#include "matador/logger/logger.hpp"
+
+namespace matador::logger {
+
+logger::logger(std::string source, std::shared_ptr<log_domain> log_domain)
+  : source_(std::move(source))
+  , logger_domain_(std::move(log_domain))
+{}
+
+logger::logger(logger&& l) noexcept
+: source_(std::move(l.source_))
+, logger_domain_(std::move(l.logger_domain_))
+{}
+
+logger& logger::operator=(logger&& l) noexcept {
+  source_ = std::move(l.source_);
+  logger_domain_ = std::move(l.logger_domain_);
+  return *this;
+}
+
+const std::string& logger::source() const
+{
+  return source_;
+}
+
+std::string logger::domain() const
+{
+  return logger_domain_->name();
+}
+
+void logger::log(const log_level lvl, const char *what) const {
+  logger_domain_->log(lvl, source_, what);
+}
+}