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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <type_traits>
#include <utility>
#include <dune/common/indices.hh>
#include <dune/common/integersequence.hh>
template <int I>
using IsEven = std::bool_constant<(I % 2 == 0)>;
int main()
{
using namespace Dune;
using namespace Dune::Indices;
auto seq0 = std::integer_sequence<int>{};
static_assert(size(seq0) == 0);
static_assert(empty(seq0) == true);
auto seq1 = std::integer_sequence<int,0>{};
static_assert(size(seq1) == 1);
static_assert(empty(seq1) == false);
static_assert(head(seq1) == std::integral_constant<int,0>{});
static_assert(front(seq1) == head(seq1));
static_assert(back(seq1) == head(seq1));
static_assert(contains(seq1, std::integral_constant<int,0>{}) == true);
static_assert(contains(seq1, std::integral_constant<int,1>{}) == false);
auto seq2 = std::integer_sequence<int,0,1>{};
auto seq2a = std::integer_sequence<int,1,0>{};
static_assert(size(seq2) == 2);
static_assert(empty(seq2) == false);
static_assert(head(seq2) == std::integral_constant<int,0>{});
static_assert(front(seq2) == head(seq2));
static_assert(back(seq2) == head(tail(seq2)));
static_assert(get<1>(seq2) == 1);
static_assert(get(seq2,1) == 1);
static_assert(contains(seq2, std::integral_constant<int,0>{}) == true);
static_assert(contains(seq2, std::integral_constant<int,1>{}) == true);
static_assert(contains(seq2, std::integral_constant<int,2>{}) == false);
static_assert(equal(seq2, sorted(seq2a)));
static_assert(equal(difference<4>(seq2),std::integer_sequence<int,2,3>{}));
auto seq3 = std::integer_sequence<int,2,7,14>{};
auto seq3a = std::integer_sequence<int,7,2,14>{};
auto seq3b = std::integer_sequence<int,14,7,2>{};
static_assert(size(seq3) == 3);
static_assert(not equal(seq3, seq3a));
static_assert(not equal(seq3, seq2));
static_assert(equal(seq3, sorted(seq3a)));
static_assert(equal(seq3b, sorted(seq3a,std::greater<>{})));
static_assert(equal(push_front<2>(tail(seq3)), seq3));
static_assert(equal(push_back<14>(std::integer_sequence<int,get<0>(seq3),get<1>(seq3)>{}), seq3));
static_assert(empty(difference(seq3,seq3a)));
static_assert(empty(difference(seq3a,seq3)));
auto seq3even = std::integer_sequence<int, 2,14>{};
static_assert(equal(filter<IsEven>(seq3), seq3even));
static_assert(equal(filter([](auto i) { return i % 2 == 0; }, seq3), seq3even));
return 0;
}
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