feat: display exception name when unhandled exception got thrown

termination.cc

@@ -9,8 +9,26 @@
 
 static void termHandler()
 {
-  QString message( "GoldenDict has crashed with an unexpected exception\n\n" );
-  qDebug() << message;
+
+  // Trick: In c++17, there is no standardized way to know the exception name/type inside terminate_handler
+  // So, we just get the exception and throw it again, so that we can call the std::exception::what :)
+
+  // This trick can be removed/improved if something similar to
+  // boost::current_exception_diagnostic_information got standardized,
+
+  std::exception_ptr curException = std::current_exception();
+
+  try {
+    if ( curException != nullptr ) {
+      std::rethrow_exception( curException );
+    }
+    else {
+      qDebug() << "GoldenDict has crashed unexpectedly.\n\n";
+    }
+  }
+  catch ( const std::exception & e ) {
+    qDebug() << "GoldenDict has crashed with exception: " << e.what() ;
+  }
 
   if( logFilePtr && logFilePtr->isOpen() )
     logFilePtr->close();