forked from OSchip/llvm-project
70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <deque>
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// iterator erase(const_iterator f)
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// Erasing items from the beginning or the end of a deque shall not invalidate iterators
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// to items that were not erased.
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#include <deque>
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#include <cassert>
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template <typename C>
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void del_at_start(C c)
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{
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typename C::iterator first = c.begin();
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typename C::iterator it1 = first + 1;
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typename C::iterator it2 = c.end() - 1;
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c.erase (first);
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typename C::iterator it3 = c.begin();
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typename C::iterator it4 = c.end() - 1;
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assert( it1 == it3);
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assert( *it1 == *it3);
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assert(&*it1 == &*it3);
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assert( it2 == it4);
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assert( *it2 == *it4);
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assert(&*it2 == &*it4);
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}
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template <typename C>
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void del_at_end(C c)
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{
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typename C::iterator first = c.end() - 1;
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typename C::iterator it1 = c.begin();
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typename C::iterator it2 = first - 1;
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c.erase (first);
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typename C::iterator it3 = c.begin();
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typename C::iterator it4 = c.end() - 1;
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assert( it1 == it3);
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assert( *it1 == *it3);
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assert(&*it1 == &*it3);
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assert( it2 == it4);
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assert( *it2 == *it4);
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assert(&*it2 == &*it4);
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}
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int main()
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{
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std::deque<int> queue;
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for (int i = 0; i < 20; ++i)
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queue.push_back(i);
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while (queue.size() > 1)
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{
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del_at_start(queue);
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del_at_end(queue);
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queue.pop_back();
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}
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}
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