37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/first.hpp>
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#include <boost/hana/functional/on.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/less.hpp>
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#include <boost/hana/pair.hpp>
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#include <boost/hana/plus.hpp>
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#include <boost/hana/sort.hpp>
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#include <boost/hana/tuple.hpp>
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#include <boost/hana/type.hpp>
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namespace hana = boost::hana;
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// infix application
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constexpr auto sorted = hana::sort.by(hana::less ^hana::on^ hana::first, hana::make_tuple(
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hana::make_pair(hana::int_c<3>, 'x'),
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hana::make_pair(hana::int_c<1>, hana::type_c<void>),
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hana::make_pair(hana::int_c<2>, 9876)
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));
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static_assert(sorted == hana::make_tuple(
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hana::make_pair(hana::int_c<1>, hana::type_c<void>),
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hana::make_pair(hana::int_c<2>, 9876),
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hana::make_pair(hana::int_c<3>, 'x')
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), "");
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// function call syntax
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constexpr auto x = hana::make_pair(1, 2);
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constexpr auto y = hana::make_pair(10, 20);
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static_assert(hana::on(hana::plus, hana::first)(x, y) == 1 + 10, "");
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int main() { }
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