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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
//
//===----------------------------------------------------------------------===//
// <deque>
// void pop_back()
// Erasing items from the beginning or the end of a deque shall not invalidate iterators
// to items that were not erased.
#include <deque>
#include <cassert>
#include "test_macros.h"
template <typename C>
void test(C c)
{
typename C::iterator it1 = c.begin();
typename C::iterator it2 = c.end() - 2;
c.pop_back();
typename C::iterator it3 = c.begin();
typename C::iterator it4 = c.end() - 1;
assert( it1 == it3);
assert( *it1 == *it3);
assert(&*it1 == &*it3);
assert( it2 == it4);
assert( *it2 == *it4);
assert(&*it2 == &*it4);
}
int main(int, char**)
{
std::deque<int> queue;
for (int i = 0; i < 20; ++i)
queue.push_back(i);
while (queue.size() > 1)
{
test(queue);
queue.pop_back();
}
return 0;
}
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