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// { dg-options "-std=gnu++23" }
// { dg-do run { target c++23 } }
#include <ranges>
#include <algorithm>
#include <utility>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
namespace ranges = std::ranges;
namespace views = std::views;
constexpr bool
test01()
{
static_assert(ranges::empty(views::zip_transform([] { return 0; })));
auto z1 = views::zip_transform(std::identity{},
std::array{1, 2, 3});
VERIFY( ranges::equal(z1, (int[]){1, 2, 3}) );
const auto i0 = z1.begin(), i1 = z1.begin() + 1;
VERIFY( i0 + 1 - 1 == i0 );
VERIFY( i0 < i1 );
VERIFY( i1 < z1.end() );
VERIFY( i1 - i0 == 1 );
VERIFY( i0 - i1 == -1 );
VERIFY( z1.end() - i1 == 2 );
VERIFY( i1 - z1.end() == -2 );
ranges::iter_swap(i0, i1);
VERIFY( ranges::equal(std::move(z1), (int[]){2, 1, 3}) );
auto z2 = views::zip_transform(std::multiplies{},
std::array{-1, 2},
std::array{3, 4, 5});
auto i2 = z2.begin();
i2 += 1;
i2 -= -1;
VERIFY( i2 == z2.end() );
VERIFY( ranges::size(z2) == 2 );
VERIFY( ranges::size(std::as_const(z2)) == 2 );
VERIFY( ranges::equal(z2, (int[]){-3, 8}) );
auto z3 = views::zip_transform([] (auto... xs) { return ranges::max({xs...}); },
std::array{1, 6, 7, 0, 0},
std::array{2, 5, 9},
std::array{3, 4, 8, 0});
VERIFY( ranges::size(z3) == 3 );
VERIFY( ranges::equal(z3, (int[]){3, 6, 9}) );
return true;
}
constexpr bool
test02()
{
using __gnu_test::test_input_range;
using __gnu_test::test_forward_range;
using __gnu_test::test_random_access_range;
using ty1 = ranges::zip_transform_view<std::plus<>,
views::all_t<test_forward_range<int>>,
views::all_t<test_random_access_range<int>>>;
static_assert(ranges::forward_range<ty1>);
static_assert(!ranges::random_access_range<ty1>);
static_assert(!ranges::sized_range<ty1>);
using ty2 = ranges::zip_transform_view<decltype([](int, int, int) { return 0; }),
views::all_t<test_forward_range<int>>,
views::all_t<test_input_range<int>>,
views::all_t<test_forward_range<int>>>;
static_assert(ranges::input_range<ty2>);
static_assert(!ranges::forward_range<ty2>);
static_assert(!ranges::sized_range<ty2>);
return true;
}
constexpr bool
test03()
{
int u[] = {1, 2, 3, 4}, v[] = {4, 5, 6};
auto z = views::zip_transform(std::plus{},
u | views::filter([](auto) { return true; }),
v);
using ty = decltype(z);
static_assert(ranges::forward_range<ty>);
static_assert(!ranges::common_range<ty>);
static_assert(!ranges::sized_range<ty>);
VERIFY( z.begin() == z.begin() );
VERIFY( z.begin() != z.end() );
VERIFY( ranges::next(z.begin(), 3) == z.end() );
auto it = z.begin();
++it;
it++;
it--;
--it;
VERIFY( it == z.begin() );
return true;
}
int
main()
{
static_assert(test01());
static_assert(test02());
static_assert(test03());
}
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