Enable scoped enums in endian_reverse

include/boost/endian/detail/endian_reverse.hpp

@@ -8,6 +8,7 @@
 
 #include <boost/endian/detail/integral_by_size.hpp>
 #include <boost/endian/detail/intrinsic.hpp>
+#include <boost/endian/detail/is_scoped_enum.hpp>
 #include <boost/type_traits/is_integral.hpp>
 #include <boost/type_traits/is_same.hpp>
 #include <boost/type_traits/enable_if.hpp>
@@ -107,14 +108,14 @@ inline uint128_type BOOST_ENDIAN_CONSTEXPR endian_reverse_impl( uint128_type x )
 // is_endian_reversible
 
 template<class T> struct is_endian_reversible: boost::integral_constant<bool,
-    boost::is_integral<T>::value && !boost::is_same<T, bool>::value>
+    (boost::is_integral<T>::value && !boost::is_same<T, bool>::value) || is_scoped_enum<T>::value>
 {
 };
 
 // is_endian_reversible_inplace
 
 template<class T> struct is_endian_reversible_inplace: boost::integral_constant<bool,
-    boost::is_integral<T>::value && !boost::is_same<T, bool>::value>
+    (boost::is_integral<T>::value && !boost::is_same<T, bool>::value) || is_scoped_enum<T>::value>
 {
 };
 

test/Jamfile.v2

@@ -98,3 +98,5 @@ run order_test.cpp ;
 run endian_reverse_test2.cpp ;
 
 run is_scoped_enum_test.cpp ;
+
+run endian_reverse_test3.cpp ;

test/endian_reverse_test3.cpp

@@ -0,0 +1,62 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/endian/conversion.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <cstddef>
+
+template<class T> void test_reverse( T x )
+{
+    using boost::endian::endian_reverse;
+
+    T x2 = endian_reverse( endian_reverse( x ) );
+
+    BOOST_TEST( x == x2 );
+}
+
+template<class T> void test_reverse_inplace( T x )
+{
+    using boost::endian::endian_reverse_inplace;
+
+    T x2( x );
+
+    endian_reverse_inplace( x2 );
+    endian_reverse_inplace( x2 );
+
+    BOOST_TEST( x == x2 );
+}
+
+enum E1 { e1 };
+
+#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
+
+enum E2: long { e2 };
+enum class E3 { e3 };
+enum class E4: long { e4 };
+
+#endif
+
+int main()
+{
+    test_reverse( 1 );
+
+#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
+
+    test_reverse( E3::e3 );
+    test_reverse( E4::e4 );
+
+#endif
+
+    test_reverse_inplace( 1 );
+
+#if !defined(BOOST_NO_CXX11_SCOPED_ENUMS)
+
+    test_reverse_inplace( E3::e3 );
+    test_reverse_inplace( E4::e4 );
+
+#endif
+
+    return boost::report_errors();
+}