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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-no-concepts
// UNSUPPORTED: libcpp-has-no-incomplete-ranges
// constexpr iterator& operator--();
// constexpr iterator operator--(int);
#include <cassert>
#include <ranges>
#include "test_macros.h"
#include "../types.h"
constexpr bool test() {
int buffer[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};
{
// outer == ranges::end
std::ranges::join_view jv(buffer);
auto iter = std::next(jv.begin(), 16);
for (int i = 16; i != 0; --i) {
assert(*--iter == i);
}
}
{
// outer == ranges::end
std::ranges::join_view jv(buffer);
auto iter = std::next(jv.begin(), 13);
for (int i = 13; i != 0; --i) {
assert(*--iter == i);
}
}
{
// outer != ranges::end
std::ranges::join_view jv(buffer);
auto iter = std::next(jv.begin(), 12);
for (int i = 12; i != 0; --i) {
assert(*--iter == i);
}
}
{
// outer != ranges::end
std::ranges::join_view jv(buffer);
auto iter = std::next(jv.begin());
for (int i = 1; i != 0; --i) {
assert(*--iter == i);
}
}
{
int small[2][1] = {{1}, {2}};
std::ranges::join_view jv(small);
auto iter = std::next(jv.begin(), 2);
for (int i = 2; i != 0; --i) {
assert(*--iter == i);
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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