1 files changed, 49 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/experimental/view/transformed/length.cpp b/src/boost/libs/hana/test/experimental/view/transformed/length.cpp
new file mode 100644
index 000000000..516df7da8
--- /dev/null
+++ b/src/boost/libs/hana/test/experimental/view/transformed/length.cpp
@@ -0,0 +1,49 @@
+// Copyright Louis Dionne 2013-2017
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+
+#include <boost/hana/assert.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/experimental/view.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/length.hpp>
+
+#include <support/seq.hpp>
+namespace hana = boost::hana;
+
+
+template <int> struct undefined { };
+
+int main() {
+    auto container = ::seq;
+
+    {
+        auto storage = container();
+        auto transformed = hana::experimental::transformed(storage, undefined<99>{});
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::length(transformed),
+            hana::size_c<0>
+        ));
+    }{
+        auto storage = container(undefined<0>{});
+        auto transformed = hana::experimental::transformed(storage, undefined<99>{});
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::length(transformed),
+            hana::size_c<1>
+        ));
+    }{
+        auto storage = container(undefined<0>{}, undefined<1>{});
+        auto transformed = hana::experimental::transformed(storage, undefined<99>{});
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::length(transformed),
+            hana::size_c<2>
+        ));
+    }{
+        auto storage = container(undefined<0>{}, undefined<1>{}, undefined<2>{});
+        auto transformed = hana::experimental::transformed(storage, undefined<99>{});
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::length(transformed),
+            hana::size_c<3>
+        ));
+    }
+}