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.

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

## Solution

Let’s check the solution below:








#include <iostream>
#include <concepts>
using namespace std;

template<typename T, typename Base>
concept ExerciseConcept = std::copyable<T>
  && std::constructible_from<T, int, float>
  && std::derived_from<Base, T>;

int main()
{
    //no need to write anything here
}

Each reused concept models a requirement, and their names are quite explanatory. Yet, there is room for simplification. If we look up the definition of [copyable](https://en.cppreference.com/w/cpp/concepts/copyable), we can see that it already makes sure that the accepted types are also movable. 

# Solution

Let’s check the solution below:








Get an overview of how to create a custom concept using concepts from the C++ standard library.

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: A Custom Concept Using Concepts from the C++ STL

Solution