definition of deque

#include <iostream>
#include "WaterEntityManager.h"
#include "Bucket.h"
#include "WaterFall.h"

int main()
{
    Bucket* rubbishbucket1=new Bucket();

    Bucket* bucket2 = new Bucket(NULL,"bucket2", 500, 0.61, 30, 20, 10, 5, Bucket::HolePosition::bottom);
    WaterFall* fall1=new WaterFall(bucket2,"fall1", 20,0.1,9.81);
    Bucket* bucket1=new Bucket(fall1,"bucket1",500,0.61,30,20,10,5,Bucket::HolePosition::bottom);
    Bucket* bucket3 = new Bucket(bucket1, "bucket3", 500, 0.61, 30, 20, 10, 5, Bucket::HolePosition::side);
    Bucket* bucket4 = new Bucket(bucket1, "bucket4", 500, 0.61, 30, 20, 10, 5, Bucket::HolePosition::side);
    std::vector<WaterEntity*> firstvector;
    firstvector.push_back(bucket2);
    firstvector.push_back(fall1);
    firstvector.push_back(bucket1);
    firstvector.push_back(bucket3);
    firstvector.push_back(bucket4);
    WaterEntityManager* manager1=new WaterEntityManager(&firstvector,0.02,9.81);

    getchar();
    getchar();
    return 1;
};

then in WaterEntityManager()-----------------------------
WaterEntityManager::dec_waterentities.push_back(std::deque<std::unique_ptr<WaterEntity>>());
    for(auto& firstiterator : *arg_ptr_vec_waterentities)
    {
        WaterEntityManager::dec_waterentities[0].push_back(std::unique_ptr<WaterEntity>(firstiterator));
    }