1 files changed, 68 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/tuple/special.fold_left.cpp b/src/boost/libs/hana/test/tuple/special.fold_left.cpp
new file mode 100644
index 000000000..cf121ebb8
--- /dev/null
+++ b/src/boost/libs/hana/test/tuple/special.fold_left.cpp
@@ -0,0 +1,68 @@
+// 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/fold_left.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/type.hpp>
+namespace hana = boost::hana;
+
+
+template <typename ...>
+struct F { struct type; };
+
+struct x0;
+struct x1;
+struct x2;
+struct x3;
+
+int main() {
+    // tuple_t and initial state
+    {
+        auto f = hana::metafunction<F>;
+        auto s = hana::type_c<struct initial_state>;
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<>, s, f),
+            s
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<x0>, s, f),
+            f(s, hana::type_c<x0>)
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<x0, x1>, s, f),
+            f(f(s, hana::type_c<x0>), hana::type_c<x1>)
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<x0, x1, x2>, s, f),
+            f(f(f(s, hana::type_c<x0>), hana::type_c<x1>), hana::type_c<x2>)
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<x0, x1, x2, x3>, s, f),
+            f(f(f(f(s, hana::type_c<x0>), hana::type_c<x1>), hana::type_c<x2>), hana::type_c<x3>)
+        ));
+    }
+
+    // tuple_t and no initial state
+    {
+        auto f = hana::metafunction<F>;
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<x0>, f),
+            hana::type_c<x0>
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<x0, x1>, f),
+            f(hana::type_c<x0>, hana::type_c<x1>)
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<x0, x1, x2>, f),
+            f(f(hana::type_c<x0>, hana::type_c<x1>), hana::type_c<x2>)
+        ));
+        BOOST_HANA_CONSTANT_CHECK(hana::equal(
+            hana::fold_left(hana::tuple_t<x0, x1, x2, x3>, f),
+            f(f(f(hana::type_c<x0>, hana::type_c<x1>), hana::type_c<x2>), hana::type_c<x3>)
+        ));
+    }
+}