221 lines
7.9 KiB
C++
221 lines
7.9 KiB
C++
/*
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* Copyright (C) 2018 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define BOOST_TEST_MODULE meta
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#include <boost/test/unit_test.hpp>
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#include <seastar/util/log.hh>
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#include "utils/meta.hh"
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namespace internal {
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template<typename T>
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struct check_constexpr {
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template<T N>
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struct check {
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enum : T {
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value = N,
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};
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};
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};
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template<typename T>
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struct first_argument { };
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template<typename R, typename T, typename... Ts>
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struct first_argument<R(T, Ts...)> {
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using type = T;
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};
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}
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#define INTERNAL_STATIC_CHECK_EQUAL(expected, actual, actual_str) \
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BOOST_CHECK_MESSAGE(internal::check_constexpr<std::decay_t<decltype(actual)>>::check<(actual)>::value == (expected), \
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actual_str " expected to be equal " #expected " [actual: " << (actual) << ", expected: " << (expected) << "]")
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#define INTERNAL_STATIC_CHECK_SAME(expr, expected, actual, actual_str) \
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BOOST_CHECK_MESSAGE(expr, actual_str " expected to be the same as " #expected \
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" [actual: " << seastar::pretty_type_name(typeid(typename internal::first_argument<void(actual)>::type)) << ", expected: " \
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<< seastar::pretty_type_name(typeid(internal::first_argument<void(expected)>::type)) << "]")
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#define STATIC_CHECK_EQUAL(expected, ...) \
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INTERNAL_STATIC_CHECK_EQUAL(expected, (__VA_ARGS__), #__VA_ARGS__)
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#define STATIC_CHECK_SAME(expected, ...) \
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INTERNAL_STATIC_CHECK_SAME((std::is_same<__VA_ARGS__, typename internal::first_argument<void(expected)>::type>::value), expected, (__VA_ARGS__), #__VA_ARGS__)
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class A { };
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class B { };
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class C { };
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class D { };
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BOOST_AUTO_TEST_CASE(find) {
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STATIC_CHECK_EQUAL(0, meta::find<A, A, B, C, D>);
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STATIC_CHECK_EQUAL(1, meta::find<B, A, B, C, D>);
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STATIC_CHECK_EQUAL(2, meta::find<C, A, B, C, D>);
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STATIC_CHECK_EQUAL(3, meta::find<D, A, B, C, D>);
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STATIC_CHECK_EQUAL(0, meta::find<A, A>);
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STATIC_CHECK_EQUAL(0, meta::find<A, A, A>);
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STATIC_CHECK_EQUAL(1, meta::find<A, B, A, A>);
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STATIC_CHECK_EQUAL(0, meta::find<A, meta::list<A, B, C, D>>);
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STATIC_CHECK_EQUAL(1, meta::find<B, meta::list<A, B, C, D>>);
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STATIC_CHECK_EQUAL(2, meta::find<C, meta::list<A, B, C, D>>);
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STATIC_CHECK_EQUAL(3, meta::find<D, meta::list<A, B, C, D>>);
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STATIC_CHECK_EQUAL(0, meta::find<A, meta::list<A>>);
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STATIC_CHECK_EQUAL(0, meta::find<A, meta::list<A, A>>);
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STATIC_CHECK_EQUAL(1, meta::find<A, meta::list<B, A, A>>);
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STATIC_CHECK_EQUAL(1, meta::find<meta::list<A>, meta::list<B>, meta::list<A>>);
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STATIC_CHECK_EQUAL(1, meta::find<meta::list<A>, meta::list<meta::list<B>, meta::list<A>>>);
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}
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BOOST_AUTO_TEST_CASE(get) {
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STATIC_CHECK_SAME(A, meta::get<0, A, B, C, D>);
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STATIC_CHECK_SAME(B, meta::get<1, A, B, C, D>);
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STATIC_CHECK_SAME(C, meta::get<2, A, B, C, D>);
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STATIC_CHECK_SAME(D, meta::get<3, A, B, C, D>);
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STATIC_CHECK_SAME(A, meta::get<0, meta::list<A, B, C, D>>);
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STATIC_CHECK_SAME(B, meta::get<1, meta::list<A, B, C, D>>);
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STATIC_CHECK_SAME(C, meta::get<2, meta::list<A, B, C, D>>);
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STATIC_CHECK_SAME(D, meta::get<3, meta::list<A, B, C, D>>);
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STATIC_CHECK_SAME(A, meta::get<0, meta::list<A>>);
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STATIC_CHECK_SAME(meta::list<A>, meta::get<0, meta::list<meta::list<A>>>);
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}
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BOOST_AUTO_TEST_CASE(take) {
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STATIC_CHECK_SAME(meta::list<A>, meta::take<1, A, B, C, D>);
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STATIC_CHECK_SAME((meta::list<A, B>), meta::take<2, A, B, C, D>);
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STATIC_CHECK_SAME((meta::list<A, B, C>), meta::take<3, A, B, C, D>);
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STATIC_CHECK_SAME((meta::list<A, B, C, D>), meta::take<4, A, B, C, D>);
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STATIC_CHECK_SAME(meta::list<A>, meta::take<1, meta::list<A, B, C, D>>);
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STATIC_CHECK_SAME((meta::list<A, B>), meta::take<2, meta::list<A, B, C, D>>);
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STATIC_CHECK_SAME((meta::list<A, B, C>), meta::take<3, meta::list<A, B, C, D>>);
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STATIC_CHECK_SAME((meta::list<A, B, C, D>), meta::take<4, meta::list<A, B, C, D>>);
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STATIC_CHECK_SAME(meta::list<A>, meta::take<1, meta::list<A>>);
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STATIC_CHECK_SAME(meta::list<meta::list<A>>, meta::take<1, meta::list<meta::list<A>>>);
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STATIC_CHECK_SAME((meta::list<meta::list<A, B>>), meta::take<1, meta::list<meta::list<A, B>>>);
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}
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BOOST_AUTO_TEST_CASE(size) {
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STATIC_CHECK_EQUAL(0, meta::size<>);
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STATIC_CHECK_EQUAL(1, meta::size<A>);
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STATIC_CHECK_EQUAL(2, meta::size<A, B>);
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STATIC_CHECK_EQUAL(3, meta::size<A, B, C>);
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STATIC_CHECK_EQUAL(4, meta::size<A, B, C, D>);
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STATIC_CHECK_EQUAL(0, meta::size<meta::list<>>);
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STATIC_CHECK_EQUAL(1, meta::size<meta::list<A>>);
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STATIC_CHECK_EQUAL(2, meta::size<meta::list<A, B>>);
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STATIC_CHECK_EQUAL(3, meta::size<meta::list<A, B, C>>);
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STATIC_CHECK_EQUAL(4, meta::size<meta::list<A, B, C, D>>);
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STATIC_CHECK_EQUAL(1, meta::size<meta::list<meta::list<A, B>>>);
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STATIC_CHECK_EQUAL(3, meta::size<meta::list<A, B>, C, D>);
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STATIC_CHECK_EQUAL(3, meta::size<meta::list<meta::list<A, B>, C, D>>);
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}
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class constexpr_count_all_fn {
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size_t _n = 0;
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public:
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constexpr constexpr_count_all_fn() = default;
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template<typename T>
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constexpr void operator()(T) { _n++; }
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constexpr size_t get() { return _n; }
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};
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template<typename... Ts>
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constexpr size_t constexpr_count_all()
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{
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constexpr_count_all_fn constexpr_fn;
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meta::for_each<Ts...>(constexpr_fn);
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return constexpr_fn.get();
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}
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BOOST_AUTO_TEST_CASE(for_each) {
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STATIC_CHECK_EQUAL(0, constexpr_count_all<>());
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STATIC_CHECK_EQUAL(4, constexpr_count_all<A, B, C, D>());
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size_t n = 0;
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meta::for_each<A, B, C, D>([&] (auto&& ptr) {
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using type = std::remove_pointer_t<std::decay_t<decltype(ptr)>>;
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switch (n) {
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case 0: STATIC_CHECK_SAME(A, type); break;
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case 1: STATIC_CHECK_SAME(B, type); break;
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case 2: STATIC_CHECK_SAME(C, type); break;
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case 3: STATIC_CHECK_SAME(D, type); break;
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default: BOOST_FAIL("should not reach"); break;
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}
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n++;
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});
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BOOST_CHECK_EQUAL(4, n);
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STATIC_CHECK_EQUAL(0, constexpr_count_all<meta::list<>>());
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STATIC_CHECK_EQUAL(4, constexpr_count_all<meta::list<A, B, C, D>>());
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n = 0;
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meta::for_each<meta::list<A, B, C, D>>([&] (auto ptr) {
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using type = std::remove_pointer_t<decltype(ptr)>;
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switch (n) {
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case 0: STATIC_CHECK_SAME(A, type); break;
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case 1: STATIC_CHECK_SAME(B, type); break;
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case 2: STATIC_CHECK_SAME(C, type); break;
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case 3: STATIC_CHECK_SAME(D, type); break;
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default: BOOST_FAIL("should not reach"); break;
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}
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n++;
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});
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BOOST_CHECK_EQUAL(4, n);
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n = 0;
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meta::for_each<meta::take<2, A, B, C, D>>([&] (auto ptr) {
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using type = std::remove_pointer_t<decltype(ptr)>;
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switch (n) {
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case 0: STATIC_CHECK_SAME(A, type); break;
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case 1: STATIC_CHECK_SAME(B, type); break;
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default: BOOST_FAIL("should not reach"); break;
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}
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n++;
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});
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BOOST_CHECK_EQUAL(2, n);
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n = 0;
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using list = meta::list<A, B, C, D>;
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meta::for_each<meta::take<meta::size<list> - 1, list>>([&] (auto ptr) {
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using type = std::remove_pointer_t<decltype(ptr)>;
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switch (n) {
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case 0: STATIC_CHECK_SAME(A, type); break;
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case 1: STATIC_CHECK_SAME(B, type); break;
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case 2: STATIC_CHECK_SAME(C, type); break;
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default: BOOST_FAIL("should not reach"); break;
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}
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n++;
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});
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BOOST_CHECK_EQUAL(3, n);
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}
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