std::pmr::polymorphic_allocator::destroy(C++17)

#include <iostream>
#include <memory_resource>

int main()
{
  std::pmr::polymorphic_allocator<int> alloc{};

  //メモリの確保
  int* array = alloc.allocate(4);

  //要素を構築
  for (int i = 0; i < 4; ++i) {
    alloc.construct(array + i, i);
  }

  for (int i = 0; i < 4; ++i) {
    std::cout << array[i] << std::endl;
  }

  //要素を破棄
  for (int i = 0; i < 4; ++i) {
    alloc.destroy(array + i);
  }

  //メモリの解放
  alloc.deallocate(array, 4);
}