小编pid*_*gun的帖子

push_back, begin, end are described as concurrent safe in https://docs.microsoft.com/en-us/cpp/parallel/concrt/reference/concurrent-vector-class?view=vs-2019#push_back

However the below code is asserting. Probably because element is added but not initialized yet.

struct MyData
   {
   explicit MyData()
      {
      memset(arr, 0xA5, sizeof arr);
      }
   std::uint8_t arr[1024];
   };

struct MyVec
   {
   concurrency::concurrent_vector<MyData> v;
   };

auto vector_pushback(MyVec &vec) -> void
   {
   vec.v.push_back(MyData{});
   }

auto vector_loop(MyVec &vec) -> void
   {
   MyData myData;
   for (auto it = vec.v.begin(); it != vec.v.end(); ++it)
      {
      auto res = memcmp(&(it->arr), &(myData.arr), sizeof myData.arr); …