Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/src/boost/libs/hana/example/slice.cpp b/src/boost/libs/hana/example/slice.cpp
new file mode 100644
index 00000000..95407931
--- /dev/null
+++ b/src/boost/libs/hana/example/slice.cpp
@@ -0,0 +1,43 @@
+// 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/core/to.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/filter.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/length.hpp>
+#include <boost/hana/mod.hpp>
+#include <boost/hana/range.hpp>
+#include <boost/hana/slice.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/type.hpp>
+namespace hana = boost::hana;
+using namespace hana::literals;
+
+
+// Slice a contiguous range
+constexpr auto xs = hana::make_tuple(0, '1', 2.2, 3_c, hana::type_c<float>);
+
+static_assert(
+    hana::slice(xs, hana::tuple_c<std::size_t, 1, 2, 3>) ==
+    hana::make_tuple('1', 2.2, 3_c)
+, "");
+
+
+// A more complex example with a non-contiguous range
+constexpr auto letters = hana::to_tuple(hana::range_c<char, 'a', 'z'>);
+constexpr auto indices = hana::to_tuple(hana::make_range(hana::size_c<0>, hana::length(letters)));
+
+auto even_indices = hana::filter(indices, [](auto n) {
+    return n % hana::size_c<2> == hana::size_c<0>;
+});
+
+BOOST_HANA_CONSTANT_CHECK(
+    hana::slice(letters, even_indices) == hana::tuple_c<char,
+        'a', 'c', 'e', 'g', 'i', 'k', 'm', 'o', 'q', 's', 'u', 'w', 'y'
+    >
+);
+
+int main() { }