1 files changed, 32 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/count_if.cpp b/src/boost/libs/hana/example/count_if.cpp
new file mode 100644
index 000000000..da7a42eba
--- /dev/null
+++ b/src/boost/libs/hana/example/count_if.cpp
@@ -0,0 +1,32 @@
+// 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/count_if.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/ext/std/integral_constant.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/mod.hpp>
+#include <boost/hana/not_equal.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/type.hpp>
+
+#include <type_traits>
+namespace hana = boost::hana;
+using namespace hana::literals;
+
+
+auto is_odd = [](auto x) {
+    return x % 2_c != 0_c;
+};
+
+int main() {
+    constexpr auto ints = hana::tuple_c<int, 1, 2, 3>;
+    BOOST_HANA_CONSTANT_CHECK(hana::count_if(ints, is_odd) == hana::size_c<2>);
+
+    constexpr auto types = hana::tuple_t<int, char, long, short, char, double>;
+    BOOST_HANA_CONSTANT_CHECK(hana::count_if(types, hana::trait<std::is_floating_point>) == hana::size_c<1>);
+    BOOST_HANA_CONSTANT_CHECK(hana::count_if(types, hana::equal.to(hana::type_c<char>)) == hana::size_c<2>);
+    BOOST_HANA_CONSTANT_CHECK(hana::count_if(types, hana::equal.to(hana::type_c<void>)) == hana::size_c<0>);
+}