Exchange vectors in std::vector::swap()

diff --git a/examples/step-18/step-18.cc b/examples/step-18/step-18.cc
index 035991a0208a196547dff77cc5199a7976326a18..cef0f64dde256b1d539fa0605df6b9ead9305997 100644 (file)
--- a/examples/step-18/step-18.cc
+++ b/examples/step-18/step-18.cc
@@ -1639,7 +1639,7 @@ namespace Step18
     // includes setting the stress variables to zero.
     {
       std::vector<PointHistory<dim>> tmp;
-      tmp.swap(quadrature_point_history);
+      quadrature_point_history.swap(tmp);
     }
     quadrature_point_history.resize(our_cells * quadrature_formula.size());