Ruler: Don't use a function that is only available in recent boost versions

diff --git a/pv/view/ruler.cpp b/pv/view/ruler.cpp
index ab08a32011cdef2aad64f62cb8e2d4aaa8fdb14b..393af57711c699732c84cfd05c1ee9933dff0f6d 100644 (file)
--- a/pv/view/ruler.cpp
+++ b/pv/view/ruler.cpp
@@ -138,12 +138,12 @@ void Ruler::paintEvent(QPaintEvent*)
                                this->view_.tick_precision());
                };
 
-               tick_position_cache_.emplace(calculate_tick_positions(
+               tick_position_cache_ = calculate_tick_positions(
                        view_.tick_period(),
                        view_.offset(),
                        view_.scale(),
                        width(),
-                       ffunc));
+                       ffunc);
        }
 
        const int ValueMargin = 3;