1 files changed, 63 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/struct.mcd.tag_dispatching.cpp b/src/boost/libs/hana/example/struct.mcd.tag_dispatching.cpp
new file mode 100644
index 000000000..9788e8305
--- /dev/null
+++ b/src/boost/libs/hana/example/struct.mcd.tag_dispatching.cpp
@@ -0,0 +1,63 @@
+// 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/core/to.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/find.hpp>
+#include <boost/hana/functional/id.hpp>
+#include <boost/hana/fwd/accessors.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/not_equal.hpp>
+#include <boost/hana/pair.hpp>
+#include <boost/hana/string.hpp>
+#include <boost/hana/tuple.hpp>
+
+#include <string>
+#include <utility>
+namespace hana = boost::hana;
+
+
+//! [main]
+struct Person {
+    std::string name;
+    int age;
+};
+
+// The keys can be anything as long as they are compile-time comparable.
+constexpr auto name = hana::integral_c<std::string Person::*, &Person::name>;
+constexpr auto age = hana::string_c<'a', 'g', 'e'>;
+
+namespace boost { namespace hana {
+    template <>
+    struct accessors_impl<Person> {
+        static BOOST_HANA_CONSTEXPR_LAMBDA auto apply() {
+            return make_tuple(
+                make_pair(name, [](auto&& p) -> decltype(auto) {
+                    return id(std::forward<decltype(p)>(p).name);
+                }),
+                make_pair(age, [](auto&& p) -> decltype(auto) {
+                    return id(std::forward<decltype(p)>(p).age);
+                })
+            );
+        }
+    };
+}}
+//! [main]
+
+int main() {
+    Person john{"John", 30}, bob{"Bob", 40};
+    BOOST_HANA_RUNTIME_CHECK(hana::equal(john, john));
+    BOOST_HANA_RUNTIME_CHECK(hana::not_equal(john, bob));
+
+    BOOST_HANA_RUNTIME_CHECK(hana::find(john, name) == hana::just("John"));
+    BOOST_HANA_RUNTIME_CHECK(hana::find(john, age) == hana::just(30));
+    BOOST_HANA_CONSTANT_CHECK(hana::find(john, BOOST_HANA_STRING("foo")) == hana::nothing);
+
+    BOOST_HANA_RUNTIME_CHECK(hana::to_tuple(john) == hana::make_tuple(
+        hana::make_pair(name, "John"),
+        hana::make_pair(age, 30)
+    ));
+}