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Programming in C/C++

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  • Macro in C language – Linux Hint

    A macro in C language is a piece of code which has been assigned a name. When the name is used anywhere in the program, the macro value is replaced before the program’s compilation. In this article, we will see in detail how to write a macro in C language.

  • Exception Handling in C++ – Linux Hint

    There are three types of software errors that exist. These are Syntax Errors, Logic Errors, and Runtime Errors.

  • C++ Qualifiers and Storage Class Specifiers – Linux Hint

    CV stands for Constant-Volatile. The declaration of an object that is not preceded by const and/or volatile is a cv-unqualified type. On the other hand, the declaration of an object that is preceded by const and/or volatile is a cv-qualified type. If an object is declared const, the value in its location cannot be changed. A volatile variable is a variable whose value is under the influence of the programmer, and hence cannot be changed by the compiler.Storage Class Specifiers refer to the life, place, and way in which a type exists. Storage class specifiers are static, mutable, thread_local, and extern.

    This article explains C++ Qualifiers and Storage Class Specifiers. Thus, some preliminary knowledge in C++ comes in handy to really appreciate the article.

  • Overloading in C++ – Linux Hint

    C++ does not allow a function that adds two integers and return an integer, to add two floats and return a float. Imagine that there is a function to add two integers and return an integer. Would it not be nice to have another function with the same name, that adds but two or even more floats to return a float? Doing so is said to be, overloading the first function.
    Arithmetic operators are typically used for arithmetic operations. Is it not nice to have the +, join two strings? Enabling that is said to be overloading the arithmetic addition operator, for strings.

    The increment operator, ++ adds 1 to an int or a float. When dealing with pointers, it does not add 1 to the pointer. It makes the pointer point to the next consecutive object in memory. An iterator points to the next object in a linked-list, but the linked-list objects are in different places in memory (not in consecutive regions). Would it not be nice to overload the increment operator for an iterator, to increment but point to the following element, in the linked-list?

    This article explains overloading in C++. It is divided into two parts: function overloading and operator overloading. Having already basic knowledge in C++ is necessary to understand the rest of the article.

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Dilution and Misuse of the "Linux" Brand

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today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.