OOP programming intro.
Dive into the world of OOP programming with a focus on encapsulation. Explore concepts like inheritance, polymorphism, and data abstraction through practical examples in C++. Understand how to implement encapsulation effectively for clean and maintainable code.
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Button.cpp Implementation #include "Button.hpp" Button::Button(int buttonPin, long int debounce) { pin = buttonPin; prevState = HIGH; prevTime = 0; counter = 0; debounceDelay = debounce; pinMode(pin, INPUT_PULLUP); } Button.hpp #ifndef BUTTON_HPP #define BUTTON_HPP #include <Arduino.h> void Button::update(long int currentTime) { bool currentState = digitalRead(pin); class Button { private: if (currentState != prevState && currentTime - prevTime > debounceDelay) { if (currentState == LOW) { counter++; } prevTime = currentTime; } int pin; bool prevState; long int prevTime; int counter; long int debounceDelay; prevState = currentState; } public: Button(int buttonPin, long int debounce = 50); bool Button::isPressed() { return prevState == LOW; } void update(long int currentTime); bool isPressed(); int Button::getCounter() { return counter; } int getCounter(); void resetCounter(); long int timeSinceLastPress(long int currentTime); void Button::resetCounter() { counter = 0; } }; #endif long int Button::timeSinceLastPress(long int currentTime) { return currentTime - prevTime; }
INO #include "Button.hpp" Button button(2); void setup() { Serial.begin(9600); } void loop() { long int currentTime = millis(); button.update(currentTime); if (button.isPressed()) { Serial.print("Button pressed, count: "); Serial.println(button.getCounter()); } // Do other non-blocking tasks here }
Polymorphism Interface** implementation (Abstract class) **Interfaces are not a concept in the OOP of C++. They can be simulated by abstract classes
How to refer to a Class/Object method ., -> , :: Symbol . . -> pointer Foo *foo = new Foo(); foo->member_var = 10; foo->member_func(); . instance Foo foo; foo.member_var = 10; foo.member_func(); :: namspace int some_val = Foo::static_var; Foo::static_method(); int max_int = std::numeric_limits<int>::max();
this The keyword this identifies a special type of pointer. Suppose that you create an object named x of class A, and class A has a non-static member function f(). If you call the function x.f(), the keyword this in the body of f() stores the address of x. Advanced links *this vs this
