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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 18:24:20 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 18:24:20 +0000 |
commit | 483eb2f56657e8e7f419ab1a4fab8dce9ade8609 (patch) | |
tree | e5d88d25d870d5dedacb6bbdbe2a966086a0a5cf /src/boost/libs/hana/example/while.cpp | |
parent | Initial commit. (diff) | |
download | ceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.tar.xz ceph-483eb2f56657e8e7f419ab1a4fab8dce9ade8609.zip |
Adding upstream version 14.2.21.upstream/14.2.21upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/boost/libs/hana/example/while.cpp')
-rw-r--r-- | src/boost/libs/hana/example/while.cpp | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/while.cpp b/src/boost/libs/hana/example/while.cpp new file mode 100644 index 00000000..73dc27f9 --- /dev/null +++ b/src/boost/libs/hana/example/while.cpp @@ -0,0 +1,45 @@ +// 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/equal.hpp> +#include <boost/hana/integral_constant.hpp> +#include <boost/hana/less.hpp> +#include <boost/hana/plus.hpp> +#include <boost/hana/while.hpp> + +#include <vector> +namespace hana = boost::hana; +using namespace hana::literals; + + +int main() { + // while_ with a Constant condition (loop is unrolled at compile-time) + { + std::vector<int> ints; + auto final_state = hana::while_(hana::less.than(10_c), 0_c, [&](auto i) { + ints.push_back(i); + return i + 1_c; + }); + + // The state is known at compile-time + BOOST_HANA_CONSTANT_CHECK(final_state == 10_c); + + BOOST_HANA_RUNTIME_CHECK(ints == std::vector<int>{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}); + } + + // while_ with a constexpr or runtime condition (loop is not unrolled) + { + std::vector<int> ints; + int final_state = hana::while_(hana::less.than(10), 0, [&](int i) { + ints.push_back(i); + return i + 1; + }); + + // The state is known only at runtime, or at compile-time if constexpr + BOOST_HANA_RUNTIME_CHECK(final_state == 10); + + BOOST_HANA_RUNTIME_CHECK(ints == std::vector<int>{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}); + } +} |