From: Matthias Maier <tamiko@43-1.org>
Date: Mon, 15 Mar 2021 22:30:37 +0000 (-0500)
Subject: examples/stpe-69: use std::copy_n instead of std::copy
X-Git-Tag: v9.3.0-rc1~324^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F11919%2Fhead;p=dealii.git

examples/stpe-69: use std::copy_n instead of std::copy

A std::copy_n is more more elegant than the std::copy variant that need
to take the address of an element past the momentum.

Thanks to @guermond and @ejtovar for pointing this out.
---

diff --git a/examples/step-69/step-69.cc b/examples/step-69/step-69.cc
index db5cb11c42..4c079630ee 100644
--- a/examples/step-69/step-69.cc
+++ b/examples/step-69/step-69.cc
@@ -1329,7 +1329,7 @@ namespace Step69
   ProblemDescription<dim>::momentum(const state_type &U)
   {
     Tensor<1, dim> result;
-    std::copy(&U[1], &U[1 + dim], &result[0]);
+    std::copy_n(&U[1], dim, &result[0]);
     return result;
   }