From: Marc Fehling <mafehling.git@gmail.com>
Date: Mon, 7 Jun 2021 20:07:12 +0000 (-0600)
Subject: Add `constexpr` to type check.
X-Git-Tag: v9.4.0-rc1~1260^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F12406%2Fhead;p=dealii.git

Add `constexpr` to type check.
---

diff --git a/include/deal.II/base/utilities.h b/include/deal.II/base/utilities.h
index 2d3b81b6f0..0643eec0c2 100644
--- a/include/deal.II/base/utilities.h
+++ b/include/deal.II/base/utilities.h
@@ -1334,7 +1334,11 @@ namespace Utilities
     // see if the object is small and copyable via memcpy. if so, use
     // this fast path. otherwise, we have to go through the BOOST
     // serialization machinery
+#ifdef DEAL_II_HAVE_CXX17
+    if constexpr (std::is_trivially_copyable<T>() && sizeof(T) * N < 256)
+#else
     if (std::is_trivially_copyable<T>() && sizeof(T) * N < 256)
+#endif
       {
         Assert(std::distance(cbegin, cend) == sizeof(T) * N,
                ExcInternalError());