iterator_range interop with variant.

test/iterator_range_variant.cpp

@@ -0,0 +1,60 @@
+// Boost.Range library
+//
+//  Copyright Neil Groves 2014. Use, modification and
+//  distribution is subject to 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)
+//
+// For more information, see http://www.boost.org/libs/range/
+//
+
+#include <boost/detail/workaround.hpp>
+
+#include <boost/range/iterator_range.hpp>
+#include <boost/range/functions.hpp>
+#include <boost/range/as_literal.hpp>
+#include <boost/variant.hpp>
+#include <boost/mpl/vector.hpp>
+#include <boost/test/test_tools.hpp>
+#include <boost/test/unit_test.hpp>
+#include <string>
+
+namespace
+{
+    enum E
+    {
+        e1, e2, e3
+    };
+
+    void test_variant_report()
+    {
+        typedef boost::mpl::vector<
+            E,
+            std::string,
+            boost::iterator_range<std::string::iterator>
+        >::type args;
+
+        typedef boost::make_variant_over<args>::type variant_t;
+
+        variant_t v;
+        std::string s;
+        v = boost::iterator_range<std::string::iterator>(s.begin(), s.end());
+        v = e2;
+        v = std::string();
+
+        // Rationale:
+        // This is cast to const char* to guard against ambiguity in the case
+        // where std::string::iterator it a char*
+        v = static_cast<const char*>("");
+    }
+}
+
+boost::unit_test::test_suite* init_unit_test_suite( int argc, char* argv[] )
+{
+    boost::unit_test::test_suite* test =
+        BOOST_TEST_SUITE("iterator range and variant interoperability");
+
+    test->add(BOOST_TEST_CASE(&test_variant_report));
+
+    return test;
+}