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

# Create a template alias 
To show that a concept can be used to make sure that an alias template specialization names a type, let’s create a template alias, `ValueTypeOf`:

```c++
template<typename T> using ValueTypeOf = T::value_type;
```

Let's use it in the concept `TypeRequirement`:
```c++
template<typename T>
concept TypeRequirement = requires {
    typename ValueTypeOf<T>;
};
```
# Use the defined constraints
Let’s declare two variables with the constraint that we just defined, a vector of `int` values and an `int`.


Get an overview of how an alias template specialization should name a type.

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

An Alias Template Specialization

Create a template alias