How to use std::expected?
To use the std::expected class template, follow the given steps:
- Create an instance of std::expected with the expected value type (T) and the error type (E).
- In case of an error, return an instance of std::expected with the error type (E).
- When an operation succeeds, return an instance of std::expected with the expected value (T).
- Utilize methods like has_value() and value() to access the value or error() to obtain the error, as needed.
C++23 – Header
C++23, the next major version of the C++ programming language, brings several exciting features and enhancements. One of the significant additions in C++23 is the <expected> header, which aims to improve error handling and make code more robust and readable. In this article, we will explore the feature of <expected> header, its purpose, and how it simplifies error handling in C++.
Problem with Error Handling
Error handling in C++ has historically been a complex and error-prone task. C++ has exceptions and error codes, but choosing the right approach and implementing error handling consistently across a codebase can be challenging. Additionally, exceptions can introduce performance overhead in certain scenarios.