copy vector into queue - c++

Question

I have vector
std::vector<OrderInfo *> vec
and a queue
queue<OrderInfo *> *myQueue = new queue<OrderInfo *>;
I want to copy the vector into the queue. I tried using How can I copy an entire vector into a queue? this answer and also this Insert into an STL queue using std::copy
but it's not working, how do I make it work?
this is what I tried:
myQueue = new queue(vec.begin(), vec.end());
i got
error: no matching function for call to
‘std::queue::queue(std::vector::iterator,
std::vector::iterator)’ myQueue = new
queue(vec.begin(), vec.end());
and when I tried this:
std::copy(vec.begin(),vec.end(),std::back_inserter(myQueue));
i got:
required from
‘BacStrategy::BacStrategy(EZXConnectionHandler&, const
string&, bool, const double&, int) [with Event_Type =
EZXOrderEventHandler; std::__cxx11::string =
std::__cxx11::basic_string]’
/home/yaodav/Desktop/git_repo/test/main.cpp:324:51: required from
here /usr/local/include/c++/7.4.0/bits/stl_iterator.h:490:7: error:
‘std::queue*’ is not a class, struct, or union type
operator=(const typename _Container::value_type& __value)

Answer 1

myQueue is a pointer, not a queue, and can’t be passed to std::back_inserter. To fix this, don’t declare it as a pointer.
Furthermore, std::back_inserter can’t be used with a std::queue, as the second link you posted explains.
Instead, simply write
std::queue<OrderInfo*> myQueue{
std::deque<OrderInfo*>(vec.begin(), vec.end())
};
If you really need a pointer, adapt the code as follows:
std::queue<OrderInfo*>* myQueue = new std::queue<OrderInfo*>{
std::deque<OrderInfo*>(vec.begin(), vec.end())
};
Lastly, if you need to fill an already initialised queue, proceed as follows: create a temporary queue using the above and assign it to your pointer:
*myQueue = std::queue<OrderInfo*>{std::deque<OrderInfo*>(vec.begin(), vec.end())};
If this looks too messy you can also create a temporary variable for that queue — but in that case you need to use std::move to ensure that the queue gets move-assigned, not expensively copied:
auto tmp = std::queue<OrderInfo*>{std::deque<OrderInfo*>(vec.begin(), vec.end())};
*myQueue = std::move(tmp);
In the same vein, consider carefully whether you want to store OrderInfos rather than pointers to OrderInfos.