©2024 by josuttis.com 1 C++ Nicolai M. Josuttis josuttis.com @NicoJosuttis C++ Concepts September 18, 2024 14:00 - 15:00 MDT ©2024 by josuttis.com 2 C++ Nicolai M. Josuttis • Independent consultant Architect – Technical Manager – SOA – X and OSF/Motif Nico Josuttis C++ Concepts @cppcon 2024-09-18 1©2024 by josuttis.com 3 C++ Concepts, Constraints, and Requirements C++20 ©2024 by josuttis.com 4 C++ add(coll1, 42); // OK add(coll2, 42); // ERROR: no push_back() C++98 Nico Josuttis C++ Concepts @cppcon 2024-09-18 2©2024 by josuttis.com 5 C++ Overloading Function Templates template

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GITOPS EXPLAINED: CONCEPTS, BENEFITS & GETTING STARTED DevOps has changed the way we develop and manage applications, resulting in faster, more consistent, more collaborative development cycles. It has

in a class - Interfaces - Pimpl idiom - Wrapper classes as a view, wrapping the original - C++20 Concepts (?) 56 Hiding your Implementation Details, Amir Kirsh @ CppCon, 2024 Passing args, exposing only Implementation Details, Amir Kirsh @ CppCon, 2024 A Meander: ConceptsWhat’s a Concept? 60 A Meander: Concepts ● A constraint on template arguments ● Evaluated to a boolean value, at compile time ● May be overload resolution A much more elegant and simple substitute for SFINAEFirst Example 61 A Meander: Concepts We want to overload two generic functions: // for types that we can iterate over template

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sion.hpp> CppCon 2020 | A Physical Units Library For the Next C++ Generic code: Boost.Units + Concepts (godbolt.org/z/erfbzr) 24#include template; CppCon 2020 | A Physical Units Library For the Next C++ Generic code: Boost.Units + Concepts (godbolt.org/z/erfbzr) 24#include templateConcepts (godbolt.org/z/erfbzr) 24template concept Length = units::traits::is_length_unit::value;

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.2023 Victor Ciura | @ciura_victor 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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

}Outline - Background (Ranges, Parallelism, Distributed Data Structures) - Distributed Ranges (Concepts) - Implementation (Algorithms and views) - Complex Data Structures (Dense and sparse learnedOutline - Background (Ranges, Parallelism, Distributed Data Structures) - Distributed Ranges (Concepts) - Implementation (Algorithms and views) - Complex Data Structures (Dense and sparse T(0), std::plus()); }Standard C++ Parallelism - All depends on ranges library, iteration concepts - Extensible: execution policies allow parallel execution using namespace std; using namespace

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3 Basic concepts 25 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 Examples 23 Scrapy Documentation, Release 1.8.4 24 Chapter 2. First steps CHAPTER THREE BASIC CONCEPTS 3.1 Command line tool New in version 0.10. Scrapy is controlled through the scrapy command-line

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 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 Learn more by playing with a pre-made Scrapy project. 22 Chapter 2. First steps CHAPTER 3 Basic concepts 3.1 Command line tool New in version 0.10. Scrapy is controlled through the scrapy command-line

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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