Initial commit.

src/core/signalchecker.cpp

@@ -0,0 +1,52 @@
+/*
+ * Strawberry Music Player
+ * This file was part of Clementine.
+ * Copyright 2010, David Sansome <me@davidsansome.com>
+ * Copyright 2012, 2014, John Maguire <john.maguire@gmail.com>
+ * Copyright 2014, Krzysztof Sobiecki <sobkas@gmail.com>
+ *
+ * Strawberry is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Strawberry is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#include "config.h"
+
+#include "signalchecker.h"
+
+#include "core/logging.h"
+
+gulong CheckedGConnect(gpointer source, const char *signal, GCallback callback, gpointer data, const int callback_param_count) {
+
+  guint signal_id = 0;
+  GQuark detail = 0;
+
+  if (!g_signal_parse_name(signal, G_OBJECT_TYPE(source), &signal_id, &detail, false)) {
+    qFatal("Connecting to invalid signal: %s", signal);
+    return 0;
+  }
+
+  GSignalQuery query;
+  g_signal_query(signal_id, &query);
+  // The signature for a signal callback is always:
+  // return_type callback(gpointer data1, params..., gpointer data2);
+  int signal_params = query.n_params + 2;
+  if (signal_params != callback_param_count) {
+    qFatal("Connecting callback to signal with different parameters counts");
+    return 0;
+  }
+
+  return g_signal_connect(source, signal, G_CALLBACK(callback), data);
+
+}
+