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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.

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

## `pair` class in STL `utility` header 
The `pair` container is a simple container defined in the header. It consists of two data elements or objects. The first element is referenced as ‘first’ and the second element as ‘second.’ The `Pair` class is used to combine two values of different types.

A `pair` container provides a way to store two heterogeneous objects as a single unit. When dealing with data that has a key-value relationship, a `pair` can be useful if the key is also required. It can be used to make new data structures that use the key-value feature. It can also be used to instantiate the points to formulate a shape. A shape is a collection of points. For a shape, a point would be a pair of coordinates.


# `pair` class in STL `utility` header 
The `pair` container is a simple container defined in the header. It consists of two data elements or objects. The first element is referenced as ‘first’ and the second element as ‘second.’ The `Pair` class is used to combine two values of different types.

A `pair` container provides a way to store two heterogeneous objects as a single unit. When dealing with data that has a key-value relationship, a `pair` can be useful if the key is also required. It can be used to make new data structures that use the key-value feature. It can also be used to instantiate the points to formulate a shape. A shape is a collection of points. For a shape, a point would be a pair of coordinates.


Try to implement the KeyPair class using the trailing <requires> clause.

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

Challenge: Implement a Pair Class Using Requires Clause

`pair` class in STL `utility` header