73ef4ff3
 Hu Chunming
提交三方库
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// Copyright Louis Dionne 2013-2022
// 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/duplicate.hpp>
#include <boost/hana/extract.hpp>
#include <boost/hana/lazy.hpp>
namespace hana = boost::hana;
int main() {
constexpr auto very_lazy = hana::duplicate(hana::make_lazy(3));
static_assert(hana::extract(hana::extract(very_lazy)) == 3, "");
}
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