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
32 lines
1.3 KiB
C++
32 lines
1.3 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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#include <boost/hana/index_if.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <cstddef>
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#include <support/counter.hpp>
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namespace hana = boost::hana;
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int main() {
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// Tests hana::index_if on an infinite iterable
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constexpr Counter<> c{};
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auto pred = [](auto i) {
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return [=](auto x) {
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return hana::bool_c<decltype(x)::value == decltype(i)::value>;
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};
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};
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static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<0>)).value()){}) == 0, "");
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static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<1>)).value()){}) == 1, "");
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static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<2>)).value()){}) == 2, "");
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static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<3>)).value()){}) == 3, "");
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static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<4>)).value()){}) == 4, "");
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static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<5>)).value()){}) == 5, "");
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static_assert(hana::value(decltype(hana::index_if(c, pred(hana::size_c<6>)).value()){}) == 6, "");
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}
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