1 files changed, 61 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/type/template.cpp b/src/boost/libs/hana/test/type/template.cpp
new file mode 100644
index 000000000..6b35d35e7
--- /dev/null
+++ b/src/boost/libs/hana/test/type/template.cpp
@@ -0,0 +1,61 @@
+// 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/concept/metafunction.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/not.hpp>
+#include <boost/hana/type.hpp>
+
+#include <type_traits>
+namespace hana = boost::hana;
+
+
+struct x1; struct x2; struct x3;
+struct y1 { }; struct y2 { }; struct y3 { };
+template <typename ...> struct f;
+
+BOOST_HANA_CONSTANT_CHECK(hana::equal(
+    hana::template_<f>(),
+    hana::type_c<f<>>
+));
+BOOST_HANA_CONSTANT_CHECK(hana::equal(
+    hana::template_<f>(hana::type_c<x1>),
+    hana::type_c<f<x1>>
+));
+BOOST_HANA_CONSTANT_CHECK(hana::equal(
+    hana::template_<f>(hana::type_c<x1>, hana::type_c<x2>),
+    hana::type_c<f<x1, x2>>
+));
+BOOST_HANA_CONSTANT_CHECK(hana::equal(
+    hana::template_<f>(hana::type_c<x1>, hana::type_c<x2>, hana::type_c<x3>),
+    hana::type_c<f<x1, x2, x3>>
+));
+
+using F = decltype(hana::template_<f>);
+static_assert(std::is_same<F::apply<>::type, f<>>{}, "");
+static_assert(std::is_same<F::apply<x1>::type, f<x1>>{}, "");
+static_assert(std::is_same<F::apply<x1, x2>::type, f<x1, x2>>{}, "");
+static_assert(std::is_same<F::apply<x1, x2, x3>::type, f<x1, x2, x3>>{}, "");
+
+// Make sure we model the Metafunction concept
+static_assert(hana::Metafunction<decltype(hana::template_<f>)>::value, "");
+static_assert(hana::Metafunction<decltype(hana::template_<f>)&>::value, "");
+
+// Make sure we can use aliases
+template <typename T> using alias = T;
+static_assert(hana::template_<alias>(hana::type_c<x1>) == hana::type_c<x1>, "");
+
+// Make sure template_ is SFINAE-friendly
+template <typename T> struct unary;
+BOOST_HANA_CONSTANT_CHECK(hana::not_(
+    hana::is_valid(hana::template_<unary>)(hana::type_c<void>, hana::type_c<void>)
+));
+
+// Make sure we don't read from a non-constexpr variable
+int main() {
+    auto t = hana::type_c<x1>;
+    constexpr auto r = hana::template_<f>(t);
+    (void)r;
+}