README.md

@@ -1,6 +0,0 @@
-Паттерн "Наблюдатель" определяет отношение "один-ко-многим" между объектами таким образом, что при изменении состояния одного объекта происходит автоматическое оповещение и обновление всех зависимых объектов.
-
-При использовании паттерна возможен как запрос, так и активная доставка данных от субъекта (запрос считается более "правильным").
-
-*Принцип:*
-- Слабосвязанные структуры более гибки и лучше выдерживают изменения.

lesson_2/CurrentConditionsDisplay.hpp

@@ -1,38 +0,0 @@
-/*
- * CurrentConditionsDisplay.hpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#pragma once
-
-#include "Observer.hpp"
-#include "DisplayElement.hpp"
-#include "WeatherData.hpp"
-
-class CurrentConditionsDisplay: public Observer, public DisplayElement
-{
-private:
-    float temperature;
-    float humidity;
-    WeatherData &weatherData;
-public:
-    CurrentConditionsDisplay(WeatherData &weatherData) :
-        temperature(0.0), humidity(0.0), weatherData(weatherData)
-    {
-        weatherData.registerObserver(*this);
-    }
-
-    void update(float temperature, float humidity, float pressure) override
-    {
-        this->temperature = temperature;
-        this->humidity = humidity;
-        display();
-    }
-
-    void display() const override
-    {
-        std::cout << "Current conditions: " << temperature << "F degrees and " << humidity << "% humidity" << std::endl;
-    }
-};

lesson_2/DisplayElement.hpp

@@ -1,16 +0,0 @@
-/*
- * DisplayElement.hpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#pragma once
-
-class DisplayElement
-{
-public:
-    virtual void display() const = 0;
-
-    virtual ~DisplayElement() {}
-};

lesson_2/ForecastDisplay.hpp

@@ -1,47 +0,0 @@
-/*
- * ForecastDisplay.hpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#pragma once
-
-#include "Observer.hpp"
-#include "DisplayElement.hpp"
-#include "WeatherData.hpp"
-
-class ForecastDisplay: public Observer, public DisplayElement
-{
-private:
-    float currentPressure;
-    float lastPressure;
-    WeatherData &weatherData;
-public:
-    ForecastDisplay(WeatherData &weatherData) :
-        currentPressure(29.92), lastPressure(0.0), weatherData(weatherData)
-    {
-        weatherData.registerObserver(*this);
-    }
-
-    void update(float temperature, float humidity, float pressure) override
-    {
-        this->lastPressure = this->currentPressure;
-        this->currentPressure = pressure;
-
-        display();
-    }
-
-    void display() const override
-    {
-        std::cout << "Forecast: ";
-        if (currentPressure > lastPressure) {
-            std::cout << "Improving weather on the way!";
-        } else if (currentPressure == lastPressure) {
-            std::cout << "More of the same";
-        } else if (currentPressure < lastPressure) {
-            std::cout << "Watch out for cooler, rainy weather";
-        }
-        std::cout << std::endl;
-    }
-};

lesson_2/HeatIndexDisplay.hpp

@@ -1,46 +0,0 @@
-/*
- * HeatIndexDisplay.hpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#pragma once
-
-#include "Observer.hpp"
-#include "DisplayElement.hpp"
-#include "WeatherData.hpp"
-
-class HeatIndexDisplay: public Observer, public DisplayElement
-{
-private:
-    float heatIndex;
-    WeatherData &weatherData;
-
-    float computeHeatIndex(float t, float rh)
-    {
-        float index = (float) ((16.923 + (0.185212 * t) + (5.37941 * rh) - (0.100254 * t * rh) + (0.00941695 * (t * t)) + (0.00728898 * (rh * rh))
-                + (0.000345372 * (t * t * rh)) - (0.000814971 * (t * rh * rh)) + (0.0000102102 * (t * t * rh * rh)) - (0.000038646 * (t * t * t))
-                + (0.0000291583 * (rh * rh * rh)) + (0.00000142721 * (t * t * t * rh)) + (0.000000197483 * (t * rh * rh * rh))
-                - (0.0000000218429 * (t * t * t * rh * rh)) + 0.000000000843296 * (t * t * rh * rh * rh))
-                - (0.0000000000481975 * (t * t * t * rh * rh * rh)));
-        return index;
-    }
-public:
-    HeatIndexDisplay(WeatherData &weatherData) : heatIndex(0.0), weatherData(weatherData)
-    {
-        weatherData.registerObserver(*this);
-    }
-
-    void update(float temperature, float humidity, float pressure) override
-    {
-        heatIndex = computeHeatIndex(temperature, humidity);
-
-        display();
-    }
-
-    void display() const override
-    {
-        std::cout << "Heat index is " << heatIndex << std::endl;
-    }
-};

lesson_2/Observer.hpp

@@ -1,16 +0,0 @@
-/*
- * Observer.hpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#pragma once
-
-class Observer
-{
-public:
-    virtual void update(float temp, float humidity, float pressure) = 0;
-
-    virtual ~Observer() {}
-};

lesson_2/StaticDisplay.hpp

@@ -1,48 +0,0 @@
-/*
- * StaticDisplay.hpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#include "Observer.hpp"
-#include "DisplayElement.hpp"
-#include "WeatherData.hpp"
-
-class StaticDisplay: public Observer, public DisplayElement
-{
-private:
-    float maxTemp;
-    float minTemp;
-    float tempSum;
-    int numReadings;
-    WeatherData &weatherData;
-public:
-    StaticDisplay(WeatherData &weatherData) :
-        maxTemp(0.0), minTemp(200.0), tempSum(0.0), numReadings(0), weatherData(weatherData)
-    {
-        weatherData.registerObserver(*this);
-    }
-
-    void update(float temperature, float humidity, float pressure) override
-    {
-        this->tempSum += temperature;
-        this->numReadings++;
-
-        if (temperature > this->maxTemp) {
-            this->maxTemp = temperature;
-        }
-
-        if (temperature < this->minTemp) {
-            this->minTemp = temperature;
-        }
-
-        display();
-    }
-
-    void display() const override
-    {
-        std::cout << "Avg/Max/Min temperature = " << (tempSum / numReadings)
-            << "/" << maxTemp << "/" << minTemp << std::endl;
-    }
-};

lesson_2/Subject.hpp

@@ -1,20 +0,0 @@
-/*
- * Subject.hpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#pragma once
-
-#include "Observer.hpp"
-
-class Subject
-{
-public:
-    virtual void registerObserver(Observer &o) = 0;
-    virtual void removeObserver(Observer &o) = 0;
-    virtual void notifyObservers() = 0;
-
-    virtual ~Subject() {}
-};

lesson_2/WeatherData.hpp

@@ -1,72 +0,0 @@
-/*
- * WeatherData.hpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#pragma once
-
-#include "Subject.hpp"
-#include <list>
-#include <functional>
-#include <iostream>
-
-class WeatherData: public Subject
-{
-private:
-    std::list<std::reference_wrapper<Observer>> observers;
-    float temperature;
-    float humidity;
-    float pressure;
-public:
-    void registerObserver(Observer &o) override
-    {
-        observers.push_back(o);
-    }
-
-    void removeObserver(Observer &o) override
-    {
-        observers.erase(std::find_if(observers.cbegin(), observers.cend(), [&](const std::reference_wrapper<Observer> &item)
-        {
-            return &item.get() == &o;
-        }));
-        std::cout << "Осталось в листе: " << observers.size() << " элементов" << std::endl;
-    }
-
-    void notifyObservers() override
-    {
-        for (Observer &observer : observers)
-        {
-            observer.update(temperature, humidity, pressure);
-        }
-    }
-
-    void measurementsChanged()
-    {
-        notifyObservers();
-    }
-
-    void setMeasurements(float temperature, float humidity, float pressure)
-    {
-        this->temperature = temperature;
-        this->humidity = humidity;
-        this->pressure = pressure;
-        measurementsChanged();
-    }
-
-    float getTemperature()
-    {
-        return temperature;
-    }
-
-    float getHumidity()
-    {
-        return humidity;
-    }
-
-    float getPressure()
-    {
-        return pressure;
-    }
-};

lesson_2/main.cpp

@@ -1,28 +0,0 @@
-/*
- * main.cpp
- *
- *  Created on: 31 окт. 2021 г.
- *      Author: alexander
- */
-
-#include "WeatherData.hpp"
-#include "CurrentConditionsDisplay.hpp"
-#include "StaticDisplay.hpp"
-#include "ForecastDisplay.hpp"
-#include "HeatIndexDisplay.hpp"
-
-int main()
-{
-    WeatherData weatherData;
-    CurrentConditionsDisplay currentDisplay(weatherData);
-    StaticDisplay staticDisplay(weatherData);
-    ForecastDisplay forecastDisplay(weatherData);
-    HeatIndexDisplay heatIndexDisplay(weatherData);
-
-    weatherData.setMeasurements(80, 65, 30.4f);
-    weatherData.setMeasurements(82, 70, 29.2f);
-    weatherData.setMeasurements(78, 90, 29.2f);
-
-    return 0;
-}
-

lesson_2/scheme

@@ -1,29 +0,0 @@
-// interface
-
-class Subject
-{
-public:
-    virtual void registerObserver() = 0;
-    virtual void removeObserver() = 0;
-    virtual void notifyObserver() = 0;
-};
-
-class Observer
-{
-public:
-    virtual void update() = 0;
-};
-
-// classes
-
-class ConcreteSubject : public Subject
-{
-public:
-    void getState();
-    void setState();
-};
-
-class ConcreteObserver : public Observer
-{
-public:
-};