Add endian_ld_st_roundtrip_test

test/Jamfile.v2

@@ -58,3 +58,6 @@ run endian_reverse_test.cpp : : : <define>BOOST_ENDIAN_NO_INTRINSICS : endian_re
 
 run endian_load_test.cpp ;
 run endian_load_test.cpp : : : <define>BOOST_ENDIAN_NO_INTRINSICS : endian_load_test_ni ;
+
+run endian_ld_st_roundtrip_test.cpp ;
+run endian_ld_st_roundtrip_test.cpp : : : <define>BOOST_ENDIAN_NO_INTRINSICS : endian_ld_st_roundtrip_test_ni ;

test/endian_ld_st_roundtrip_test.cpp

@@ -0,0 +1,46 @@
+// Copyright 2019 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/endian/detail/endian_load.hpp>
+#include <boost/endian/detail/endian_store.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+#include <cstddef>
+
+template<class T> void test( T const& x )
+{
+    {
+        unsigned char buffer[ sizeof(T) ];
+
+        boost::endian::endian_store<T, sizeof(T), boost::endian::order::little>( x, buffer );
+        T x2 = boost::endian::endian_load<T, sizeof(T), boost::endian::order::little>( buffer );
+
+        BOOST_TEST_EQ( x, x2 );
+    }
+
+    {
+        unsigned char buffer[ sizeof(T) ];
+
+        boost::endian::endian_store<T, sizeof(T), boost::endian::order::big>( x, buffer );
+        T x2 = boost::endian::endian_load<T, sizeof(T), boost::endian::order::big>( buffer );
+
+        BOOST_TEST_EQ( x, x2 );
+    }
+}
+
+enum E
+{
+    e = 0xF1F2F3
+};
+
+int main()
+{
+    test( 1.2e+34f );
+    test( -1.234e+56 );
+    test( e );
+
+    return boost::report_errors();
+}