New tests, to measure if container headers include all what's needed to use them.

test/explicit_inst_flat_map_test.cpp

@@ -0,0 +1,28 @@
+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2015-2015. 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)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#include <boost/container/flat_map.hpp>
+
+struct empty
+{
+   friend bool operator == (const empty &, const empty &){ return true; }
+   friend bool operator <  (const empty &, const empty &){ return true; }
+};
+
+template class ::boost::container::flat_map<empty, empty>;
+template class ::boost::container::flat_multimap<empty, empty>;
+
+int main()
+{
+   ::boost::container::flat_map<empty, empty> dummy;
+   ::boost::container::flat_multimap<empty, empty> dummy2;
+   (void)dummy; (void)dummy2;
+   return 0;
+}