From 72f0ebe8d06991968c6f792c0a846519a795cac1 Mon Sep 17 00:00:00 2001
From: Andrey Semashev <andrey.semashev@gmail.com>
Date: Sun, 24 May 2020 00:29:51 +0300
Subject: [PATCH] Adjusted the check for C++20 on gcc 10.

The compiler defines __cplusplus to a non-standard value less than 202002
in C++20 mode.
---
 test/iterator_traits_test.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/iterator_traits_test.cpp b/test/iterator_traits_test.cpp
index 467373a..7abf56a 100644
--- a/test/iterator_traits_test.cpp
+++ b/test/iterator_traits_test.cpp
@@ -23,6 +23,7 @@
 #include <boost/type_traits/is_same.hpp>
 #include <boost/operators.hpp>
 #include <boost/static_assert.hpp>
+#include <boost/config.hpp>
 #include <iterator>
 #include <vector>
 #include <list>
@@ -153,7 +154,8 @@ input_iterator_test<std::istream_iterator<int>, int, std::ptrdiff_t, int*, int&,
         istream_iterator_test;
 
 // C++20 changed ostream_iterator::difference_type to ptrdiff_t.
-#if __cplusplus >= 202002L && (\
+// Note: gcc 10.1 defines __cplusplus to a value less than 202002L, but greater than 201703L in C++20 mode.
+#if __cplusplus > 201703L && (\
     (defined(BOOST_LIBSTDCXX_VERSION) && BOOST_LIBSTDCXX_VERSION >= 100100) \
     )
 #define BOOST_ITERATOR_CXX20_OSTREAM_ITERATOR