1 files changed, 58 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/tutorial/mpl_cheatsheet.cpp b/src/boost/libs/hana/example/tutorial/mpl_cheatsheet.cpp
new file mode 100644
index 000000000..d9e87345a
--- /dev/null
+++ b/src/boost/libs/hana/example/tutorial/mpl_cheatsheet.cpp
@@ -0,0 +1,58 @@
+// 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/config.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/ext/boost/mpl/vector.hpp>
+#include <boost/hana/ext/std/integral_constant.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/plus.hpp>
+#include <boost/hana/tuple.hpp>
+
+#include <boost/mpl/fold.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/next.hpp>
+#include <boost/mpl/placeholders.hpp>
+#include <boost/mpl/vector.hpp>
+
+#include <type_traits>
+namespace hana = boost::hana;
+namespace mpl = boost::mpl;
+
+
+namespace with_mpl {
+//! [mpl]
+using types = mpl::vector<long, float, short, float, long, long double>;
+using number_of_floats = mpl::fold<
+    types,
+    mpl::int_<0>,
+    mpl::if_<std::is_floating_point<mpl::_2>,
+        mpl::next<mpl::_1>,
+        mpl::_1
+    >
+>::type;
+static_assert(number_of_floats::value == 3, "");
+//! [mpl]
+}
+
+namespace with_hana {
+//! [hana]
+constexpr auto types = hana::tuple_t<long, float, short, float, long, long double>;
+BOOST_HANA_CONSTEXPR_LAMBDA auto number_of_floats = hana::fold_left(
+    types,
+    hana::int_c<0>,
+    [](auto count, auto t) {
+        return hana::if_(hana::trait<std::is_floating_point>(t),
+            count + hana::int_c<1>,
+            count
+        );
+    }
+);
+BOOST_HANA_CONSTANT_CHECK(number_of_floats == hana::int_c<3>);
+//! [hana]
+}
+
+int main() { }