1 files changed, 38 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/unique.cpp b/src/boost/libs/hana/example/unique.cpp
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+++ b/src/boost/libs/hana/example/unique.cpp
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+// 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/comparing.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/type.hpp>
+#include <boost/hana/unique.hpp>
+
+#include <string>
+namespace hana = boost::hana;
+using namespace std::literals;
+
+
+// unique without a predicate
+constexpr auto types = hana::tuple_t<int, float, float, char, int, int, int, double>;
+BOOST_HANA_CONSTANT_CHECK(
+    hana::unique(types) == hana::tuple_t<int, float, char, int, double>
+);
+
+int main() {
+    // unique with a predicate
+    auto objects = hana::make_tuple(1, 2, "abc"s, 'd', "efg"s, "hij"s, 3.4f);
+    BOOST_HANA_RUNTIME_CHECK(
+        hana::unique(objects, [](auto const& t, auto const& u) {
+            return hana::typeid_(t) == hana::typeid_(u);
+        })
+        == hana::make_tuple(1, "abc"s, 'd', "efg"s, 3.4f)
+    );
+
+    // unique.by is syntactic sugar
+    BOOST_HANA_RUNTIME_CHECK(
+        hana::unique.by(hana::comparing(hana::typeid_), objects) ==
+            hana::make_tuple(1, "abc"s, 'd', "efg"s, 3.4f)
+    );
+}