From e69120bf13113d7e5cc5fe23df723cacc89d9b17 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 7 Sep 2021 02:09:28 +0100
Subject: Update to C++20 for constexpr virtual destructors

---
 Jamroot.jam                  | 2 +-
 slicer/test/preprocessor.cpp | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Jamroot.jam b/Jamroot.jam
index d9e20c7..7910d73 100644
--- a/Jamroot.jam
+++ b/Jamroot.jam
@@ -11,7 +11,7 @@ variant coverage : debug ;
 project
   : requirements
 			<define>ICE_CPP11_MAPPING
-			<cxxstd>17
+			<cxxstd>20
 			<visibility>hidden
 			<linkflags>"-Wl,-z,defs,--warn-once,--gc-sections"
 			<variant>release:<lto>on
diff --git a/slicer/test/preprocessor.cpp b/slicer/test/preprocessor.cpp
index 72afa63..506eb1e 100644
--- a/slicer/test/preprocessor.cpp
+++ b/slicer/test/preprocessor.cpp
@@ -18,8 +18,8 @@ unsigned int
 total()
 {
 	const auto t = std::accumulate(
-			COMPONENTS_IN_TEST_ICE.begin(), COMPONENTS_IN_TEST_ICE.end(), 0U, [](auto & t, auto && c) {
-				return t += c.second;
+			COMPONENTS_IN_TEST_ICE.begin(), COMPONENTS_IN_TEST_ICE.end(), 0U, [](const auto & t, const auto & c) {
+				return t + c.second;
 			});
 	BOOST_CHECK_EQUAL(49, t);
 	return t;
-- 
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