Constrain the primary endian_reverse to not apply to class types; add test. Fixes #41.

test/endian_reverse_test2.cpp

@@ -0,0 +1,39 @@
+// Copyright 2019, 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/endian/conversion.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/type_traits/enable_if.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/cstdint.hpp>
+
+namespace N
+{
+
+struct X
+{
+    boost::uint32_t m;
+};
+
+template<class T> typename boost::enable_if_<boost::is_same<T, X>::value, T>::type endian_reverse( T x )
+{
+    using boost::endian::endian_reverse;
+
+    X r = { endian_reverse( x.m ) };
+    return r;
+}
+
+} // namespace N
+
+int main()
+{
+    using namespace boost::endian;
+
+    N::X x1 = { 0x01020304 };
+    N::X x2 = endian_reverse( x1 );
+
+    BOOST_TEST_EQ( x2.m, 0x04030201 );
+
+    return boost::report_errors();
+}