Make atomic_shared_ptr's default constructor constexpr

test/atomic_sp_constexpr_test.cpp

@@ -0,0 +1,67 @@
+//
+// atomic_sp_constexpr_test.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>
+#include <boost/detail/workaround.hpp>
+
+#define HAVE_CONSTEXPR_INIT
+
+#if defined( BOOST_NO_CXX11_CONSTEXPR )
+# undef HAVE_CONSTEXPR_INIT
+#endif
+
+#if BOOST_WORKAROUND( BOOST_MSVC, <= 1910 )
+# undef HAVE_CONSTEXPR_INIT
+#endif
+
+#if defined(__clang__) && defined( BOOST_NO_CXX14_CONSTEXPR )
+# undef HAVE_CONSTEXPR_INIT
+#endif
+
+#if !defined( HAVE_CONSTEXPR_INIT ) || !defined( BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX )
+
+int main()
+{
+}
+
+#else
+
+#include <boost/atomic_shared_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+struct X
+{
+};
+
+struct Z
+{
+    Z();
+};
+
+static Z z;
+
+static boost::atomic_shared_ptr<X> p1;
+
+Z::Z()
+{
+    p1 = boost::shared_ptr<X>( new X );
+}
+
+int main()
+{
+    bost::shared_ptr<X> p2 = p1;
+
+    BOOST_TEST( p2.get() != 0 );
+    BOOST_TEST_EQ( p2.use_count(), 1 );
+
+    return boost::report_errors();
+}
+
+#endif // #if defined( BOOST_NO_CXX11_CONSEXPR )