48 lines
1.9 KiB
C++
48 lines
1.9 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/detail/first_unsatisfied_index.hpp>
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#include <boost/hana/not_equal.hpp>
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#include <laws/base.hpp>
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#include <type_traits>
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namespace hana = boost::hana;
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using hana::test::ct_eq;
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struct poison {
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poison() = default;
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poison(poison const&) = delete;
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};
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int main() {
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auto predicate = [](auto x) {
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static_assert(!std::is_same<poison, decltype(x)>::value, "");
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return hana::not_equal(x, ct_eq<9>{});
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};
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using Find = hana::detail::first_unsatisfied_index<decltype(predicate)>;
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static_assert(decltype(Find{}())::value == 0, "");
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static_assert(decltype(Find{}(ct_eq<9>{}))::value == 0, "");
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static_assert(decltype(Find{}(ct_eq<0>{}))::value == 1, "");
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static_assert(decltype(Find{}(ct_eq<9>{}, poison{}))::value == 0, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}))::value == 1, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}))::value == 2, "");
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static_assert(decltype(Find{}(ct_eq<9>{}, poison{}, poison{}))::value == 0, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}, poison{}))::value == 1, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<9>{}))::value == 2, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}))::value == 3, "");
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static_assert(decltype(Find{}(ct_eq<9>{}, poison{}, poison{}, poison{}))::value == 0, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<9>{}, poison{}, poison{}))::value == 1, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<9>{}, poison{}))::value == 2, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<9>{}))::value == 3, "");
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static_assert(decltype(Find{}(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}))::value == 4, "");
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}
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