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https://github.com/boostorg/hana.git
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2c86ba2390
- Rename fold{l,r,l1,r1} to fold.{right,left} with overloads.
- Rename foldlM/foldrM to monadic_fold.{left,right}
- Add no-state variants of the monadic folds
- Improve the fold's documentation
- Deprecate the previous folds; they'll be removed soon
Fixes #18.
60 lines
1.4 KiB
C++
60 lines
1.4 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/pair.hpp>
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using namespace boost::hana;
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int main() {
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{
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//! [make<Pair>]
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BOOST_HANA_CONSTEXPR_CHECK(first(make<Pair>(1, 'x')) == 1);
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BOOST_HANA_CONSTEXPR_CHECK(second(make<Pair>(1, 'x')) == 'x');
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//! [make<Pair>]
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}{
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//! [make_pair]
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BOOST_HANA_CONSTEXPR_CHECK(make_pair(1, 'x') == make<Pair>(1, 'x'));
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//! [make_pair]
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}{
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//! [comparable]
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BOOST_HANA_CONSTEXPR_CHECK(make<Pair>(1, 'x') == make<Pair>(1, 'x'));
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BOOST_HANA_CONSTEXPR_CHECK(make<Pair>(2, 'x') != make<Pair>(1, 'x'));
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BOOST_HANA_CONSTEXPR_CHECK(make<Pair>(1, 'y') != make<Pair>(1, 'x'));
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//! [comparable]
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}{
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//! [orderable]
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BOOST_HANA_CONSTEXPR_CHECK(make<Pair>(1, 'x') < make<Pair>(1, 'y'));
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BOOST_HANA_CONSTEXPR_CHECK(make<Pair>(1, 'x') < make<Pair>(10, 'x'));
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BOOST_HANA_CONSTEXPR_CHECK(make<Pair>(1, 'y') < make<Pair>(10, 'x'));
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//! [orderable]
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}{
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//! [foldable]
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BOOST_HANA_CONSTEXPR_CHECK(fold.left(make<Pair>(1, 3), 0, plus) == 4);
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BOOST_HANA_CONSTEXPR_CHECK(fold.right(make<Pair>(1, 3), 0, minus) == -2);
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//! [foldable]
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}{
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//! [product]
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BOOST_HANA_CONSTEXPR_CHECK(first(make<Pair>(1, 'x')) == 1);
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BOOST_HANA_CONSTEXPR_CHECK(second(make<Pair>(1, 'x')) == 'x');
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//! [product]
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}
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}
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