| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <vector> |
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| 10 | |
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| 11 | // void push_back(const value_type& x); |
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| 12 | // |
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| 13 | // If no reallocation happens, then references, pointers, and iterators before |
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| 14 | // the insertion point remain valid but those at or after the insertion point, |
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| 15 | // including the past-the-end iterator, are invalidated. |
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| 16 | |
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| 17 | // REQUIRES: has-unix-headers |
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| 18 | // REQUIRES: libcpp-has-abi-bounded-iterators-in-vector |
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| 19 | // UNSUPPORTED: c++03 |
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| 20 | // UNSUPPORTED: libcpp-hardening-mode=none |
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| 21 | // XFAIL: libcpp-hardening-mode=debug && availability-verbose_abort-missing |
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| 22 | |
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| 23 | #include <vector> |
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| 24 | #include <cassert> |
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| 25 | #include <cstddef> |
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| 26 | |
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| 27 | #include "check_assertion.h" |
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| 28 | |
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| 29 | int main(int, char**) { |
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| 30 | std::vector<int> vec; |
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| 31 | vec.reserve(4); |
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| 32 | std::size_t old_capacity = vec.capacity(); |
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| 33 | assert(old_capacity >= 4); |
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| 34 | |
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| 35 | vec.push_back(0); |
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| 36 | vec.push_back(1); |
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| 37 | vec.push_back(2); |
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| 38 | auto it = vec.begin(); |
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| 39 | vec.push_back(3); |
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| 40 | assert(vec.capacity() == old_capacity); |
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| 41 | |
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| 42 | // The capacity did not change, so the iterator remains valid and can reach the new element. |
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| 43 | assert(*it == 0); |
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| 44 | assert(*(it + 1) == 1); |
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| 45 | assert(*(it + 2) == 2); |
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| 46 | assert(*(it + 3) == 3); |
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| 47 | |
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| 48 | while (vec.capacity() == old_capacity) { |
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| 49 | vec.push_back(42); |
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| 50 | } |
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| 51 | TEST_LIBCPP_ASSERT_FAILURE( |
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| 52 | *(it + old_capacity), "__bounded_iter::operator*: Attempt to dereference an iterator at the end" ); |
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| 53 | // Unfortunately, the bounded iterator does not detect that it's been invalidated and will still allow attempts to |
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| 54 | // dereference elements 0 to 3 (even though they refer to memory that's been reallocated). |
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| 55 | |
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| 56 | return 0; |
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| 57 | } |
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| 58 | |
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