From 19fcec84d8d7d21e796c7624e521b60d28ee21ed Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:45:59 +0200
Subject: Adding upstream version 16.2.11+ds.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/boost/libs/hana/example/extend.cpp | 35 ++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 src/boost/libs/hana/example/extend.cpp

(limited to 'src/boost/libs/hana/example/extend.cpp')

diff --git a/src/boost/libs/hana/example/extend.cpp b/src/boost/libs/hana/example/extend.cpp
new file mode 100644
index 000000000..9d5351b19
--- /dev/null
+++ b/src/boost/libs/hana/example/extend.cpp
@@ -0,0 +1,35 @@
+// 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/eval.hpp>
+#include <boost/hana/extend.hpp>
+#include <boost/hana/extract.hpp>
+#include <boost/hana/lazy.hpp>
+
+#include <functional>
+#include <istream>
+#include <sstream>
+namespace hana = boost::hana;
+
+
+template <typename T>
+T read_one(std::istream& s) {
+    T value;
+    s >> value;
+    return value;
+}
+
+int main() {
+    std::stringstream s;
+    s << "1 2 3";
+
+    auto from_stream = hana::extend(hana::make_lazy(read_one<int>)(std::ref(s)), [](auto i) {
+        return hana::eval(i) + 1;
+    });
+
+    BOOST_HANA_RUNTIME_CHECK(hana::extract(from_stream) == 2);
+    BOOST_HANA_RUNTIME_CHECK(hana::extract(from_stream) == 3);
+    BOOST_HANA_RUNTIME_CHECK(hana::extract(from_stream) == 4);
+}
-- 
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