QT flush display

ui.uiname->repaint();

Creating thread with their id's

for(i=0;i < numthereads;i++)
workers.push_back(thread(&ThreadPool::thread_loop,this,i));

Place new object to specific location

To fill i th element of the array :
new (groups+i) Group();

Two small console debug tools

#define step() toc=tic;tic=GetTickCount();printf("Elapsed: %d\n",tic-toc);
#define pause() system("pause");