What is a Friend? A friend declaration appears within a class and grants a function or another class access to the private and protected members of the class that declares the friend (https://en.cppreference.com/w/cpp/language/friend.html). Points to note: Friend declarations are made within the class, but their specific location is not restricted and is not subject to … Read more
In embedded projects, some resources are inherently unique: watchdog timers, RTCs, system clocks, debug serial ports, loggers, system configuration managers, CRC modules… If these modules are carelessly piled up with global variables, issues such as initialization order chaos, difficult-to-trace write access, and ISR/task concurrency collisions will inevitably arise. The goal of the singleton pattern is … Read more
Follow our official account to keep receiving embedded knowledge without interruption! 1. Singleton Pattern The Singleton Pattern ensures that a class has only one instance and provides a global access point to that instance. The core structure diagram of the Singleton Pattern: [Image][Image][Image][Image][Image][Image] The structure typically includes: a private static instance (…
The singleton pattern in C++11 is one of the best practices we are familiar with. It utilizes the characteristics of static variables to safely implement lazy initialization, thread safety, and automatic memory management with very concise code. The implementation of the lazy singleton pattern in C++11 is roughly as follows: #include <iostream> class Singleton { … Read more
The static keyword has existed in C since it indicates static storage characteristics, affecting the lifespan, scope, and linkage of variables and functions. In C++, static is extended to class design, enabling class-level data sharing and method invocation, becoming the core mechanism for implementing class-level variables and static member functions. Let’s take a look at … Read more
In programming, we sometimes use the singleton pattern:It aims to ensure that a class has only one instance and provides a global access point to that instance. This pattern involves a single class that is responsible for creating its own objects while ensuring that only a single object is created.Common applications of the singleton pattern … Read more
Background Have you heard of the Singleton Pattern in Python? I encountered it while reading someone else’s code and didn’t understand what that piece of code meant. Later, when I searched for information, I learned that the purpose of that code is to create a single instance. It was from that moment that I became … Read more
Fundamental Differences Between Member Functions and C Functions From an assembly perspective, the essential difference between member functions and ordinary C functions lies in the implicit <span>this</span> pointer passing: ; Ordinary C function call push param2 ; Parameter 2 push param1 ; Parameter 1 call CFunction ; Direct call add rsp, 10h ; Clean up … Read more
1. Singleton Pattern The Singleton Pattern ensures that a class has only one instance and provides a global access point. Core structure diagram of the Singleton Pattern: The structure typically includes: A private static instance (pointer to itself) A private constructor (to prevent external instantiation) A public static method (to get the unique instance) In … Read more
Design and Implementation of Singleton Pattern in C Language The Singleton Pattern is a commonly used software design pattern that ensures a class has only one instance and provides a global access point to that instance. Implementing the Singleton Pattern in C is relatively complex because C is a procedural programming language and does not … Read more