Make default constructors constexpr

test/sp_constexpr_test2.cpp

@@ -0,0 +1,53 @@
+//
+// sp_constexpr_test2.cpp
+//
+// Copyright 2017 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/config.hpp>
+
+#if defined( BOOST_NO_CXX11_CONSTEXPR )
+
+int main()
+{
+}
+
+#else
+
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/enable_shared_from_this.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct X: public boost::enable_shared_from_this<X>
+{
+    int v_;
+
+    constexpr X() BOOST_NOEXCEPT: v_( 1 )
+    {
+    }
+};
+
+struct Z
+{
+    Z();
+};
+
+static Z z;
+static X x;
+
+Z::Z()
+{
+    BOOST_TEST_EQ( x.v_, 1 );
+}
+
+int main()
+{
+    return boost::report_errors();
+}
+
+#endif // #if defined( BOOST_NO_CXX11_CONSEXPR )