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.

Let's get started.

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

# How to write constrained template parameters

Constrained template parameters are a bit terser than the ones we’ve discussed so far. They also have some limitations.

```c++
template <Number T>
auto add(T a, T b) {
  return a+b;
}
```

As we can see, we don’t need any `requires` clause here. We can simply define a requirement on our template parameters right where we declare them. We use a concept name instead of the keyword `typename`. We’ll achieve the very same result as with the previous two methods.

Let’s check it out in the example below.

Learn how to use the constrained template parameter to write concepts.

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

The Constrained Template Parameter

How to write constrained template parameters