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89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
/*
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@copyright Louis Dionne 2015
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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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*/
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#include <boost/hana/assert.hpp>
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#include <boost/hana/config.hpp>
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#include <boost/hana/ext/std/array.hpp>
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#include <boost/hana/ext/std/tuple.hpp>
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#include <boost/hana/foldable.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/logical.hpp>
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#include <boost/hana/range.hpp>
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#include <boost/hana/sequence.hpp>
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#include <boost/hana/tuple.hpp>
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#include <array>
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#include <string>
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#include <tuple>
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using namespace boost::hana;
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int main() {
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{
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//! [make<Tuple>]
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auto xs = make<Tuple>(1, 2, '3', std::string{"456"});
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constexpr auto ys = make<Tuple>(1, '2', 3.456);
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//! [make<Tuple>]
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(void)xs; (void)ys;
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}{
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//! [tuple_t]
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BOOST_HANA_CONSTANT_CHECK(
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to<Tuple>(tuple_t<int, char, void, int(float)>)
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==
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make<Tuple>(type<int>, type<char>, type<void>, type<int(float)>)
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);
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//! [tuple_t]
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}{
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//! [tuple_c]
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BOOST_HANA_CONSTANT_CHECK(
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to<Tuple>(tuple_c<int, 0, 1, 2>)
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==
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make<Tuple>(int_<0>, int_<1>, int_<2>)
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);
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BOOST_HANA_CONSTANT_CHECK(head(tuple_c<int, 0, 1, 2>) == int_<0>);
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//! [tuple_c]
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}{
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//! [Foldable]
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using namespace literals;
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constexpr auto numbers = tuple_c<int, 5, -1, 0, -7, -2, 0, -5, 4>;
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constexpr auto negatives = tuple_c<int, -1, -7, -2, -5>;
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BOOST_HANA_CONSTEXPR_LAMBDA auto keep_negatives = [](auto n, auto acc) {
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return if_(n < 0_c, prepend(acc, n), acc);
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};
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BOOST_HANA_CONSTANT_CHECK(fold.right(numbers, tuple_c<int>, keep_negatives) == negatives);
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//! [Foldable]
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}{
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//! [Tuple_interop]
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BOOST_HANA_CONSTEXPR_CHECK(
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to<Tuple>(std::make_tuple(1, '2', 3.3)) == make<Tuple>(1, '2', 3.3)
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);
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BOOST_HANA_CONSTANT_CHECK(
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to<Tuple>(range(int_<1>, int_<4>)) == make<Tuple>(int_<1>, int_<2>, int_<3>)
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);
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BOOST_HANA_CONSTEXPR_CHECK(
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to<Tuple>(std::array<int, 3>{{1, 2, 3}}) == make<Tuple>(1, 2, 3)
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);
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//! [Tuple_interop]
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}
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} |