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-rw-r--r--src/window_gui.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/window_gui.h b/src/window_gui.h
index db42cafcd..b338d345f 100644
--- a/src/window_gui.h
+++ b/src/window_gui.h
@@ -192,6 +192,8 @@ struct WindowDesc : ZeroedMemoryAllocator {
static void LoadFromConfig();
static void SaveToConfig();
+ bool operator< (WindowDesc * const &other) const;
+
private:
int16 default_width_trad; ///< Preferred initial width of the window (pixels at 1x zoom).
int16 default_height_trad; ///< Preferred initial height of the window (pixels at 1x zoom).