Creating New Futures

Explore how to create and manage futures in C++20 using std::make_ready_future, std::make_exceptional_future, and future composition functions std::when_all and std::when_any. Understand how these features enable efficient handling of concurrent tasks and simplify asynchronous programming.

We'll cover the following...

- - std::make_ready_future and std::make_exceptional_future
- - std::when_any and std::when_all
- - std::when_all
- - std::when_any

C++20 gets four new functions for creating special futures: std::make_ready_future, std::make_execptional_future, std::when_all, and std::when_any. First, let’s look at the functions std::make_ready_future, and std::make_exceptional_future.

`std::make_ready_future` and `std::make_exceptional_future`

Both functions create a future that is immediately ready. In the first case, the future has a value; in the second case, an exception. Therefore, what seems to be strange at first actually makes a ...

1.Introduction

2.A Quick Overview

3.Memory Model: The Contract

4.Memory Model: Atomics

5.Memory Model: Synchronization and Ordering Constraints

6.Memory Model: Fences

7.Multithreading: Threads

8.Multithreading: Shared Data

9.Multithreading: Local Data

10.Multithreading: Condition Variables

11.Multithreading: Tasks

12.Case Study: Calculate Sum of a Vector

13.Case Study: Thread-Safe Initialization of a Singleton

14.Case Study: Ongoing Optimization with CppMem

15.Parallel Algorithms of the Standard Template Library

16.The Future: C++20

17.Coding Examples

18.Best Practices

19.The Time Library

20.Glossary

21.About the Author

Creating New Futures

`std::make_ready_future` and `std::make_exceptional_future`

Creating New Futures

std::make_ready_future and std::make_exceptional_future

`std::make_ready_future` and `std::make_exceptional_future`