Gain insights into C++20 Concepts to enhance type safety. Delve into creating compiler-checked criteria for templates and improving error clarity for seamless generic code development.

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c++20

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This course will walk you through the newest version of C++ 20, C++ Concepts.

You will go through one of the most significant new features in C++20, which is Concepts. Concepts allow you to create compiler-checked criteria for template parameters, revolutionizing the way you think about and develop generic code. You can use them to provide both syntactic and semantic requirements. They also allow you to explicitly express your goal in the type system. If something goes wrong, you'll get a clear error message from the compiler.

While useful, Concepts can be difficult to apply and even confusing sometimes. This course provides you with the knowledge you need to overcome these obstacles and move on to more complex topics.

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C++ Concepts: Improve Type Safety with C++ 20

# Solution

The most famous solution to  the GCD problem is Euclid’s algorithm. Euclid's algorithm is an efficient algorithm that computes the GCD of two given integers. . On **line 6**, we create a concept `Number` and on **line 9** it is required by the function for both the template parameters. Because the same concept is required for both template parameters, only integer numbers can be passed to the function.

The function  `gcd()` is based on the following observation: if `d` divides `a` and `d` divides `b`, `d` divides `a - b` as well. The GCD of `a` and `b` is the same as the GCD of `a - b` and `b`.

- Stop if `a == b`. The GCD of `a` and `b`, of course, is `a`. If not, go to the next step.
- If `a > b`, replace `a` with `a-b`, then go to the first step.
- If `b > a`, replace `b` with `b-a`, then go to the first step.

Get an overview of how to find the GCD of two integers by using the <requires> clause.


Solution: GCD of Two Integers Using the <requires> Clause

Get an overview of how to find the GCD of two integers by using the <requires> clause.

Introduction

The Concept Behind C++ Concepts

Four Ways to use Concepts in Functions

C++ Concepts with Classes

Concepts Shipped with the C++ Standard Library

How to Write Your Own C++ Concepts

How to Use C++ Concepts in Real Life

Summary

Solution: GCD of Two Integers Using the <requires> Clause

Solution