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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clang-gcc.tar.gz

c++20

clang

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.

Let's get started.

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

## Solution 

On **line 8**, we create a simple concept `Number` that is applied to the typename `T` and `U`, so `T` and `U` can pass numeric values only. In the main function, the `KeyPair` class is tested on `int` and `double`. We can test on `float` as well. We can uncomment **line 31** and compile the code to see the error message for a `string` type.   

# Solution 

On **line 8**, we create a simple concept `Number` that is applied to the typename `T` and `U`, so `T` and `U` can pass numeric values only. In the main function, the `KeyPair` class is tested on `int` and `double`. We can test on `float` as well. We can uncomment **line 31** and compile the code to see the error message for a `string` type.   

Get an overview of how to  implement the KeyPair class 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: Implement KeyPair Class Using <requires> Clause

Solution