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

`requires std::floating_point<T> || std::unsigned_integral <T>`

`requires (std::floating_point<T> || !std::unsigned_integral <T>)`

`requires std::floating_point<T> || !std::unsigned_integral <T>`

**(Select all that apply)** Which `requires` clause compiles in the following context?

```c++
#include <concepts>
#include <type_traits>

template <typename T>
/*requires clause comes here*/
T add(T a, T b) {
return a+b;
}
```

(Select all that apply) Which <code>requires</code> clause compiles in the following context?
<pre><code class="language-c++">#include &lt;concepts&gt;
#include &lt;type_traits&gt;

template &lt;typename T&gt;
/*requires clause comes here*/
T add(T a, T b) {
return a+b;
}
</code></pre>

**(Select all that apply)** Which function signatures satisfy the concept below?
```c++
template <typename T>
concept HasSquare = requires (T t) {
 {t.square()} -> std::convertible_to<int>;
}
```

(Select all that apply) Which function signatures satisfy the concept below?
<pre><code class="language-c++">template &lt;typename T&gt;
concept HasSquare = requires (T t) {
 {t.square()} -&gt; std::convertible_to&lt;int&gt;;
}
</code></pre>

In what context can we use type requirements?

In what context can we use type requirements?

Specifying additional constraints in a concept without introducing another named concept.

Specifying additional concepts that would be used only once.


What can we avoid by using nesting requirements?




What can we avoid by using nesting requirements?

Choose the best answer.

Choose the best answer.

Test your understanding of writing C++ 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

Quiz: Write Our Own C++ Concepts