Get the tests warning free with gcc, and add conceptual-header-inclusion tests.

[SVN r57948]

test/integer_traits_include_test.cpp

@@ -0,0 +1,37 @@
+//  Copyright John Maddock 2009.  
+//  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/integer_traits.hpp> // must be the only #include!
+
+template <class T>
+void check_numeric_limits_derived(const std::numeric_limits<T>&){}
+
+template <class T>
+void check()
+{
+   typedef boost::integer_traits<T> traits;
+   check_numeric_limits_derived(traits());
+   bool b = traits::is_integral;
+   (void)b;
+   T v = traits::const_min + traits::const_max;
+   (void)v;
+}
+
+int main()
+{
+   check<signed char>();
+   check<unsigned char>();
+   check<char>();
+   check<short>();
+   check<unsigned short>();
+   check<int>();
+   check<unsigned int>();
+   check<signed long>();
+   check<unsigned long>();
+#ifdef BOOST_HAS_LONG_LONG
+   check<boost::long_long_type>();
+   check<boost::ulong_long_type>();
+#endif
+}