Nullable Values, std::optional and Monadic Operations

A comprehensive guide to using std::optional to represent values that may or may not be present.

Ryan McCombe
Updated
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Questions & Answers

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When should I use std::optional in C++?
In what situations is it appropriate to use std::optional instead of just regular values or pointers?
std::optional vs pointers in C++
When should I use std::optional instead of a pointer in C++? What are the differences?
Accessing the value in a std::optional
What is the best way to access the value stored in a std::optional? When should I use value() vs operator*?
Using std::optional for class members
How can I use std::optional for members in my C++ classes? Can you provide an example?
Checking if a std::optional has a value
What are the different ways to check if a std::optional contains a value?
Monadic operations with std::optional
Can you explain and provide examples of the monadic operations available for std::optional in C++23?
Using std::optional as a return type
When is it appropriate to use std::optional as a return type for a function?
Performance considerations with std::optional
Are there any performance considerations to keep in mind when using std::optional?
Using std::optional with pointers
Can std::optional be used with pointers? If so, how?