josuttis | eckstein IT communication ## Back To Basics Concepts ## NICOLAI JOSUTTIS  September 18, 2024 14:00 - 15:00 jpg)  C++20 ## Concepts, Constraints, and Requirements C++ ©2024 by josuttis.com 3 josuttis | eckstein IT communication for declarations (ignoring return types) josuttis | eckstein IT communication Constraints with Concepts C++20 template concept HasPushBack = requires (CollT c, CollT::value_type v)

# GITOPS EXPLAINED: CONCEPTS, BENEFITS & GETTING STARTED  DevOps has changed the way we develop and manage applications

Implementing Math Expressions Calculator A walk through polymorphism, smart pointers, templates, concepts and more Amir Kirsh  Using C++20 concepts! ## Removing the need to explicitly create Numbers! Attempt #3: http://coliru.stacked-crooked require safety nets to avoid abuse or obscure compilation errors (use static_assert and SFINAE or concepts to restrict usage) - Don’t avoid using templates because of longer compilation time, there are

CATEGORIES (CONCEPTS) • input_iterator • output_iterator • forward_iterator • bidirectional_iterator • random_access_iterator • contiguous_iterator ## C++17 iterator categories got a concepts specification different concepts ## I TERATOR CONCEPT QUESTIONS 1. Am I using any standard algorithms? Which concept(s) do they require? • also informs complexity guarantees, maybe different for different concepts 2. Do concept(s) do they require? • also informs complexity guarantees, maybe different for different concepts 2. Do I look at an element after moving past it? 3. Do I return an element after moving past it

divisible_by3); // [6, 3] https://godbolt.org/z/bnchn9jaf ## talk outline • range basics & concepts • range algo details and survey • range views details and survey • adjuncts • observations & interally controlled by algorithm • added projection arguments • return values improved ## range concepts: sized, etc • range - provides a begin iterator and an end sentinel - input_range - specifies algorithms, but better • improved return information compared to STL for some algos • specified with concepts ## cheatsheet c++2x Range Algorithms ** queries : ~find~, ~find_if~, ~find_if_not~ ** queries

Generic Programming” paper, we see that regular types naturally appear as necessary foundational concepts in programming. Why do we need to bother with such taxonomies? Because STL assumes such properties behavior for the caller. This talk will explore the relation between Regular types (plus other concepts) and STL constructs, with examples, common pitfalls and guidance. ## S Advanced Installer ![I talking about this? We shall see that Regular types naturally appear as necessary foundational concepts in programming and try to investigate how these requirements fit in the ever expanding C++ standard

#### Generic code: Boost.Units + Concepts (godbolt.org/z/erfbzr) #include #### Generic code: Boost.Units + Concepts (godbolt.org/z/erfbzr) ### #include > #### Generic code: Boost.Units + Concepts (godbolt.org/z/erfbzr) #include template ### Generic code: Nic Holthaus + Concepts (godbolt.org/z/zen4KE) template concept Length = units::traits::is_length_unit::value;

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3 Basic concepts 23 3.1 Command line tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . chapter for a quick overview of the most important ones. You can continue from the section Basic concepts to know more about the command-line tool, spiders, selectors and other things the tutorial hasn’t 4. Examples 21 Scrapy Documentation, Release 1.3.3 22 Chapter 2. First steps CHAPTER 3 Basic concepts Command line tool New in version 0.10. Scrapy is controlled through the scrapy command-line tool

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3 Basic concepts 23 3.1 Command line tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . chapter for a quick overview of the most important ones. You can continue from the section Basic concepts to know more about the command-line tool, spiders, selectors and other things the tutorial hasn’t 4. Examples 21 Scrapy Documentation, Release 1.2.3 22 Chapter 2. First steps CHAPTER 3 Basic concepts Command line tool New in version 0.10. Scrapy is controlled through the scrapy command-line tool

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3 Basic concepts 21 3.1 Command line tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continue by playing with an example project (see Examples), and then continue with the section Basic concepts. Examples The best way to learn is with examples, and Scrapy is no exception. For this reason, there 4. Examples 19 Scrapy Documentation, Release 1.0.7 20 Chapter 2. First steps CHAPTER 3 Basic concepts Command line tool New in version 0.10. Scrapy is controlled through the scrapy command-line tool