Split BOOST_TEST_TRAIT_SAME into its own header, rename to BOOST_TEST_SAME

test/lightweight_test_same.cpp

@@ -0,0 +1,36 @@
+//
+// Test for BOOST_TEST_SAME
+//
+// Copyright 2014, 2019 Peter Dimov
+//
+// Distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+
+#include <boost/core/lightweight_test_same.hpp>
+
+struct X
+{
+    typedef int type;
+};
+
+template<class T1, class T2> struct Y
+{
+    typedef T1 type;
+};
+
+int main()
+{
+    BOOST_TEST_SAME(X, X);
+    BOOST_TEST_SAME(void, void);
+    BOOST_TEST_SAME(char[1], char[1]);
+    BOOST_TEST_SAME(char[], char[]);
+    BOOST_TEST_SAME(void(), void());
+    BOOST_TEST_SAME(X::type, X::type);
+    BOOST_TEST_SAME(X::type, Y<int, float>::type);
+    BOOST_TEST_SAME(Y<int, float>, Y<int, float>);
+    BOOST_TEST_SAME(Y<void, float>::type, void);
+
+    return boost::report_errors();
+}