playlist/memory: use std::forward_list instead of GSList

1 files changed, 63 insertions, 0 deletions

diff --git a/src/SongPointer.hxx b/src/SongPointer.hxx
new file mode 100644
index 000000000..c80f96f4d
--- /dev/null
+++ b/src/SongPointer.hxx
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_SONG_POINTER_HXX
+#define MPD_SONG_POINTER_HXX
+
+#include "song.h"
+
+#include <utility>
+
+class SongPointer {
+	struct song *song;
+
+public:
+	explicit SongPointer(struct song *_song)
+		:song(_song) {}
+
+	SongPointer(const SongPointer &) = delete;
+
+	SongPointer(SongPointer &&other):song(other.song) {
+		other.song = nullptr;
+	}
+
+	~SongPointer() {
+		if (song != nullptr)
+			song_free(song);
+	}
+
+	SongPointer &operator=(const SongPointer &) = delete;
+
+	SongPointer &operator=(SongPointer &&other) {
+		std::swap(song, other.song);
+		return *this;
+	}
+
+	operator const struct song *() const {
+		return song;
+	}
+
+	struct song *Steal() {
+		auto result = song;
+		song = nullptr;
+		return result;
+	}
+};
+
+#endif