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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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

In the `<iterator>` header, we’ll find concepts that can be very useful in dealing with algorithms.  The functions in `<iterator>` do not operate directly on containers but through `iterators`.

# `std::indirect_unary_predicate<F, I>`

Some concepts are related to callables. For those, we can specify that we accept only unary predicates.

A **predicate** is a callable that returns either a `bool` value or a value that can be converted to a `bool`. A **unary predicate** is a predicate that takes one parameter as its input.

The following example is just for demonstration. It will generate an error when compiled. Let’s look at the code below to get an idea of how unary predicates work.





Get an overview of the concepts in the <iterator> header that are shipped with the C++ standard library. 

Concepts in the <iterator> Header

Get an overview of the concepts in the <iterator> header that are shipped with 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

Concepts in the <iterator> Header

`std::indirect_unary_predicate<F, I>`