Using std::apply on std::expected in C++23

Denis Bélanger 💎⚡✨
6 min readSep 30, 2024

Streamlining Error Handling in C++23

Effectively handling mistakes and managing return values is essential in today’s C++ development. The typical method of working with functions that return {std::expected} types includes a lot of checks and error handling code, which can complicate the logic and make the code more difficult to maintain.

This paper investigates the use of a more sophisticated and general method to simplify error management. In order to reduce boilerplate code and improve readability, we’ll investigate constructing a `magic_apply` method that aggregates the results of many {std::expected} values and passes them to another function.

Effective Error Management Using Variable Templates

The std::expected type is used in the scripts to ease error handling in C++23. The main goal is to develop a generic function called magic_apply that can transmit the output of several std::expected values to another function. By doing this, the tedious error-checking that is usually necessary when working with many std::expected values is reduced. magic_apply is quite…

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Denis Bélanger 💎⚡✨

Written by Denis Bélanger 💎⚡✨

A lifeless programming SuperHero. Passionate coder & email aficionado. Always exploring tech, unraveling SMTP mysteries, and crafting efficient solutions.

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