libcxx/test/std/containers/sequences/vector/vector.modifiers/destroy_elements.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // Ensure that all the elements in the vector are destroyed, especially when reallocating the internal buffer
  10
  11 // UNSUPPORTED: c++03
  12
  13 #include <algorithm>
  14 #include <array>
  15 #include <cassert>
  16 #include <cstddef>
  17 #include <vector>
  18
  19 #include "test_macros.h"
  20
  21 struct DestroyTracker {
  22   TEST_CONSTEXPR_CXX20 DestroyTracker(std::vector<bool>& vec) : vec_(&vec), index_(vec.size()) { vec.push_back(false); }
  23
  24   TEST_CONSTEXPR_CXX20 DestroyTracker(const DestroyTracker& other) : vec_(other.vec_), index_(vec_->size()) {
  25     vec_->push_back(false);
  26   }
  27
  28   TEST_CONSTEXPR_CXX20 DestroyTracker& operator=(const DestroyTracker&) { return *this; }
  29   TEST_CONSTEXPR_CXX20 ~DestroyTracker() { (*vec_)[index_] = true; }
  30
  31   std::vector<bool>* vec_;
  32   size_t index_;
  33 };
  34
  35 template <class Operation>
  36 TEST_CONSTEXPR_CXX20 void test(Operation operation) {
  37   std::vector<bool> all_destroyed;
  38
  39   {
  40     std::vector<DestroyTracker> v;
  41     for (size_t i = 0; i != 100; ++i)
  42       operation(v, all_destroyed);
  43   }
  44
  45   assert(std::all_of(all_destroyed.begin(), all_destroyed.end(), [](bool b) { return b; }));
  46 }
  47
  48 TEST_CONSTEXPR_CXX20 bool test() {
  49   test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.emplace_back(tracker); });
  50   test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.push_back(tracker); });
  51   test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.emplace(vec.begin(), tracker); });
  52   test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.insert(vec.begin(), tracker); });
  53   test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) { vec.resize(vec.size() + 1, tracker); });
  54 #if TEST_STD_VER >= 23
  55   test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) {
  56     vec.insert_range(vec.begin(), std::array<DestroyTracker, 2>{tracker, tracker});
  57   });
  58
  59   test([](std::vector<DestroyTracker>& vec, std::vector<bool>& tracker) {
  60     vec.append_range(std::array<DestroyTracker, 2>{tracker, tracker});
  61   });
  62 #endif
  63
  64   return true;
  65 }
  66
  67 int main() {
  68   test();
  69 #if TEST_STD_VER >= 20
  70   static_assert(test());
  71 #endif
  72 }