#include "Observer.h"
#include "Subject.h"

void Subject::Attach(Observer* obv) {
 _obvs.push_front(obv);
}

void Subject::Detach(Observer* obv) {
 if (obv != nullptr) {
 _obvs.remove(obv);
 }
}

void Subject::Notify() {
 for (auto obv : _obvs) {
 obv->Update(this);
 }
}

Subject::~Subject() { }

Subject::Subject() { 
 //_obvs.clear();
}

string ConcreteSubject::GetState() {
 return _st;
}

void ConcreteSubject::SetState(const string& st) {
 _st = st;
}