Fix build with some older compilers.

diff --git a/src/wx/audio_plot.cc b/src/wx/audio_plot.cc
index 4e4b6d6a003810d59f353969d2048214917a6284..90a4aa91df39b5a5cc468ba8a3850b0b5f4b2ba4 100644 (file)
--- a/src/wx/audio_plot.cc
+++ b/src/wx/audio_plot.cc
@@ -477,7 +477,7 @@ AudioPlot::mouse_moved (wxMouseEvent& ev)
                search (_peak, ev, min_dist, min_point);
        }
 
-       _cursor = {};
+       _cursor = boost::none;
 
        if (min_dist < DBL_MAX) {
                wxRect before (min_point.draw.x - _cursor_size / 2, min_point.draw.y - _cursor_size / 2, _cursor_size, _cursor_size);
@@ -493,7 +493,7 @@ AudioPlot::mouse_moved (wxMouseEvent& ev)
 void
 AudioPlot::mouse_leave (wxMouseEvent &)
 {
-       _cursor = {};
+       _cursor = boost::none;
        Refresh ();
        Cursor (optional<DCPTime>(), optional<float>());
 }