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// { dg-do run { target c++26 } }
// { dg-add-options no_pch }
#include <ranges>
#if __cpp_lib_ranges_concat != 202403L
# error "Feature-test macro __cpp_lib_ranges_concat has wrong value in <ranges>"
#endif
#include <algorithm>
#include <vector>
#include <array>
#include <sstream>
#include <utility>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
namespace ranges = std::ranges;
namespace views = std::views;
constexpr bool
test01()
{
std::vector<int> v1{1, 2, 3}, v2{4, 5}, v3{};
std::array a{6, 7, 8};
auto s = views::single(9);
auto v = views::concat(v1, v2, v3, a, s);
VERIFY( ranges::size(v) == 9 );
VERIFY( ranges::size(std::as_const(v)) == 9 );
VERIFY( ranges::equal(v, views::iota(1, 10)) );
VERIFY( ranges::equal(v | views::reverse,
views::iota(1, 10) | views::reverse) );
auto it0 = v.begin();
auto cit = std::as_const(v).begin();
VERIFY( it0 == it0 );
VERIFY( cit == cit );
VERIFY( it0 == cit );
for (int i = 0; i < 10; i++)
{
VERIFY( it0 + i - it0 == i );
VERIFY( it0 + i - (it0 + 1) == i - 1 );
VERIFY( it0 + i - (it0 + 3) == i - 3 );
VERIFY( it0 + i - (it0 + 5) == i - 5 );
VERIFY( it0 + i - i + i == it0 + i );
VERIFY( it0 + i - (it0 + i) == 0 );
}
VERIFY( std::default_sentinel - it0 == 9 );
VERIFY( it0 + 9 == std::default_sentinel );
auto it5 = it0+5;
ranges::iter_swap(it0, it5);
VERIFY( *it0 == 6 && *it5 == 1 );
ranges::iter_swap(it0, it5);
*it0 = ranges::iter_move(it0);
return true;
}
void
test02()
{
int x[] = {1, 2, 3, 4, 5};
__gnu_test::test_input_range rx(x);
auto v = views::concat(views::single(0), rx, views::empty<int>);
static_assert(!ranges::forward_range<decltype(v)>);
VERIFY( ranges::equal(v | views::drop(1), x) );
}
void
test03()
{
// LWG 4166 - concat_view::end() should be more constrained in order to
// support noncopyable iterators
auto range_copyable_it = std::vector<int>{1, 2, 3};
std::stringstream ss{"4 5 6"};
auto range_noncopyable_it = views::istream<int>(ss);
ranges::range auto view1 = views::concat(range_copyable_it, range_noncopyable_it);
VERIFY( ranges::equal(view1, std::vector{1, 2, 3, 4, 5, 6}) );
ss = std::stringstream{"4 5 6"};
range_noncopyable_it = views::istream<int>(ss);
ranges::range auto view2 = views::concat(range_noncopyable_it, range_copyable_it);
VERIFY( ranges::equal(view2, std::vector{4, 5, 6, 1, 2, 3}) );
}
void
test04()
{
// PR libstdc++/115215 - views::concat rejects non-movable reference
int x[] = {1,2,3};
struct nomove {
nomove() = default;
nomove(const nomove&) = delete;
};
auto v = x | views::transform([](int) { return nomove{}; });
using type = decltype(views::concat(v));
using type = decltype(v);
}
int
main()
{
static_assert(test01());
test01();
test02();
test03();
test04();
}
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