45 lines
1.3 KiB
C++
45 lines
1.3 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/assert.hpp>
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#include <boost/hana/equal.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/span.hpp>
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#include <boost/hana/tuple.hpp>
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namespace hana = boost::hana;
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constexpr auto xs = hana::make_tuple(hana::int_c<1>, hana::int_c<2>, hana::int_c<3>, hana::int_c<4>);
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BOOST_HANA_CONSTANT_CHECK(
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hana::span(xs, hana::less.than(hana::int_c<3>))
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==
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hana::make_pair(hana::make_tuple(hana::int_c<1>, hana::int_c<2>),
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hana::make_tuple(hana::int_c<3>, hana::int_c<4>))
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);
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BOOST_HANA_CONSTANT_CHECK(
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hana::span(xs, hana::less.than(hana::int_c<0>))
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==
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hana::make_pair(hana::make_tuple(), xs)
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);
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BOOST_HANA_CONSTANT_CHECK(
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hana::span(xs, hana::less.than(hana::int_c<5>))
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==
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hana::make_pair(xs, hana::make_tuple())
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);
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// span.by is syntactic sugar
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BOOST_HANA_CONSTANT_CHECK(
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hana::span.by(hana::less.than(hana::int_c<3>), xs)
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==
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hana::make_pair(hana::make_tuple(hana::int_c<1>, hana::int_c<2>),
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hana::make_tuple(hana::int_c<3>, hana::int_c<4>))
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);
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int main() { }
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