diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:45:59 +0000 |
commit | 19fcec84d8d7d21e796c7624e521b60d28ee21ed (patch) | |
tree | 42d26aa27d1e3f7c0b8bd3fd14e7d7082f5008dc /src/boost/libs/hana/example/extend.cpp | |
parent | Initial commit. (diff) | |
download | ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.tar.xz ceph-19fcec84d8d7d21e796c7624e521b60d28ee21ed.zip |
Adding upstream version 16.2.11+ds.upstream/16.2.11+dsupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/boost/libs/hana/example/extend.cpp')
-rw-r--r-- | src/boost/libs/hana/example/extend.cpp | 35 |
1 files changed, 35 insertions, 0 deletions
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); +} |