6d086796a3
- Adds index_if
- Rewrites detail::index_if to use recursive alias stuff
optimized for tuple and basic_tuple
- find_if now uses index_if for Iterables
- at_key now uses index_if for Sequence
- Removes duplicate code and unnecessary special case implementations
- detail::advance_until
- at_key::advance_until
- tuple_tag implementation of find_if
- Uses Foldable instead of Sequence for cases where length is known.
(find_if had a specialization when Iterable and not Sequence)
- Adds test.*.auto.index_if for Sequences
- Adds test support/counter for testing infinite iterables
82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Copyright Jason Rice 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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#ifndef BOOST_HANA_TEST_AUTO_INDEX_IF_HPP
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#define BOOST_HANA_TEST_AUTO_INDEX_IF_HPP
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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/index_if.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/optional.hpp>
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#include "test_case.hpp"
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#include <laws/base.hpp>
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#include <support/tracked.hpp>
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namespace _test_index_if_detail { template <int> struct invalid { }; }
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TestCase test_index_if{[]{
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namespace hana = boost::hana;
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using hana::test::ct_eq;
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using _test_index_if_detail::invalid;
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::index_if(MAKE_TUPLE(), hana::equal.to(ct_eq<0>{})),
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hana::nothing
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::index_if(MAKE_TUPLE(ct_eq<0>{}), hana::equal.to(ct_eq<0>{})),
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hana::just(hana::size_c<0>)
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::index_if(MAKE_TUPLE(ct_eq<0>{}), hana::equal.to(ct_eq<42>{})),
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hana::nothing
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::index_if(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), hana::equal.to(ct_eq<0>{})),
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hana::just(hana::size_c<0>)
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::index_if(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), hana::equal.to(ct_eq<1>{})),
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hana::just(hana::size_c<1>)
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::index_if(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), hana::equal.to(ct_eq<2>{})),
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hana::just(hana::size_c<2>)
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));
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BOOST_HANA_CONSTANT_CHECK(hana::equal(
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hana::index_if(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), hana::equal.to(ct_eq<42>{})),
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hana::nothing
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));
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#ifndef MAKE_TUPLE_NO_CONSTEXPR
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auto type_equal = [](auto type) { return [=](auto&& value) {
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return hana::equal(hana::typeid_(value), type);
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};};
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static_assert(decltype(hana::equal(
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hana::index_if(MAKE_TUPLE(1, '2', 3.3), type_equal(hana::type_c<int>)),
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hana::just(hana::size_c<0>)
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)){}, "");
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static_assert(decltype(hana::equal(
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hana::index_if(MAKE_TUPLE(1, '2', 3.3), type_equal(hana::type_c<char>)),
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hana::just(hana::size_c<1>)
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)){}, "");
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static_assert(decltype(hana::equal(
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hana::index_if(MAKE_TUPLE(1, '2', 3.3), type_equal(hana::type_c<double>)),
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hana::just(hana::size_c<2>)
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)){}, "");
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static_assert(decltype(hana::equal(
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hana::index_if(MAKE_TUPLE(1, '2', 3.3), type_equal(hana::type_c<invalid<42>>)),
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hana::nothing
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)){}, "");
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#endif
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}};
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#endif // !BOOST_HANA_TEST_AUTO_INDEX_IF_HPP
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