1 files changed, 75 insertions, 0 deletions
diff --git a/src/helper/auto-connection.h b/src/helper/auto-connection.h
new file mode 100644
index 0000000..bfefcd7
--- /dev/null
+++ b/src/helper/auto-connection.h
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#ifndef SEEN_AUTO_CONNECTION_H
+#define SEEN_AUTO_CONNECTION_H
+
+#include <sigc++/connection.h>
+
+namespace Inkscape {
+
+// Class to simplify re-subscribing to connections; automates disconnecting
+
+class auto_connection
+{
+public:
+    auto_connection(sigc::connection const &c)
+        : _connection(c)
+    {}
+
+    auto_connection() = default;
+
+    ~auto_connection() { _connection.disconnect(); }
+
+    auto_connection(auto_connection const &) = delete;
+    auto_connection &operator=(auto_connection const &) = delete;
+
+    // re-assign
+    auto_connection &operator=(sigc::connection const &c)
+    {
+        _connection.disconnect();
+        _connection = c;
+        return *this;
+    }
+
+    /** Returns whether the connection is still active
+     *  @returns @p true if connection is still ative
+     */
+    operator bool() const noexcept { return _connection.connected(); }
+
+    /** Returns whether the connection is still active
+     *  @returns @p true if connection is still ative
+     */
+    inline bool connected() const noexcept { return _connection.connected(); }
+
+    /** Sets or unsets the blocking state of this connection.
+     * @param should_block Indicates whether the blocking state should be set or unset.
+     * @return @p true if the connection has been in blocking state before.
+     */
+    inline bool block(bool should_block = true) noexcept
+    {
+        return _connection.block(should_block);
+    }
+
+    inline bool unblock() noexcept { return _connection.unblock(); }
+
+    void disconnect() { _connection.disconnect(); }
+
+private:
+    sigc::connection _connection;
+};
+
+} // namespace Inkscape
+
+#endif // SEEN_AUTO_CONNECTION_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
+