From 5142300b2efca6a61008002255adc7bb1043cf9f Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Wed, 22 Sep 2021 12:22:52 -0400
Subject: [PATCH] undo "risky" C++20 related changes

---
 src/DPD-REACT/random_external_state.h | 4 ++--
 src/KOKKOS/kokkos_type.h              | 4 +---
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/DPD-REACT/random_external_state.h b/src/DPD-REACT/random_external_state.h
index 9a69392a3b..503118f0bf 100644
--- a/src/DPD-REACT/random_external_state.h
+++ b/src/DPD-REACT/random_external_state.h
@@ -78,8 +78,8 @@
 namespace random_external_state {
 typedef uint64_t es_RNG_t;
 
-constexpr uint32_t MAX_URAND = 0xffffffffU;
-constexpr uint64_t MAX_URAND64 = 0xffffffffffffffffULL - 1;
+enum { MAX_URAND = 0xffffffffU };
+enum { MAX_URAND64 = 0xffffffffffffffffULL - 1 };
 
 LAMMPS_INLINE
 uint32_t es_urand(es_RNG_t &state_)
diff --git a/src/KOKKOS/kokkos_type.h b/src/KOKKOS/kokkos_type.h
index 44fa9f2ecb..05c839db3f 100644
--- a/src/KOKKOS/kokkos_type.h
+++ b/src/KOKKOS/kokkos_type.h
@@ -25,9 +25,7 @@
 #include <Kokkos_ScatterView.hpp>
 #include <Kokkos_UnorderedMap.hpp>
 
-constexpr unsigned int FULL = 1u;
-constexpr unsigned int HALFTHREAD = 2u;
-constexpr unsigned int HALF = 4u;
+enum{FULL=1u,HALFTHREAD=2u,HALF=4u};
 
 #if defined(KOKKOS_ENABLE_CXX11)
 #undef ISFINITE