Add constexpr support to Boost.Array

[SVN r82834]

test/array_constexpr.cpp

@@ -0,0 +1,43 @@
+/* tests using constexpr on boost:array
+ * (C) Copyright Marshall Clow 2012
+ * 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 <string>
+#include <iostream>
+#include <boost/array.hpp>
+#include <algorithm>
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+#include <array>
+#endif
+
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+
+#ifndef BOOST_NO_CXX11_CONSTEXPR
+constexpr boost::array<int, 10> arr  {{ 0,1,2,3,4,5,6,7,8,9 }};
+constexpr std::array<int, 10> arr_std {{ 0,1,2,3,4,5,6,7,8,9 }};
+
+template <typename T>
+void sink ( T t ) {}
+
+template <typename T, size_t N>
+void sink ( boost::array<T,N> &arr ) {}
+
+BOOST_AUTO_TEST_CASE( test_main )
+{
+//    constexpr int two = arr_std.at (2);
+    constexpr int three = arr.at (3);
+    int whatever [ arr.at(4) ];
+    (void)three;
+	(void) whatever;
+}
+
+#else	// no constexpr means no constexpr tests!
+BOOST_AUTO_TEST_CASE( test_main )
+{
+}
+#endif
+