Code execution at the bar opening

t is often necessary to execute code only at new bar opening. It may be useful for sending e-mails or showing alerts, when it has to be done once for every bar. There are surely a lot of use cases. I present you the code of a function returning true if this is the first tick of a new bar:

bool isNewBar() {
 static int prevTime;
 bool newBar=false; 

 if(Time[0]!=prevTime) {
  newBar=true;
  prevTime=Time[0];
 }

 return(newBar);
}

Then you only need to check the value of isNewBar:

if(isNewBar()) {
 // code to execute in a new bar
}