Can you explain what std::optional is in C++14?
Sure! std::optional is a feature in C++14 that allows you to represent optional values, meaning a value that may or may not be present.
How do I use std::optional in my code?
You can use std::optional by including the header <optional> and then declaring an optional variable like this: std::optional<int> opt; You can assign a value or leave it empty.
What are the benefits of using std::optional?
The main benefits are improved code clarity and safety. It helps avoid using sentinel values and makes it clear when a value might be absent.
Can you give me an example of std::optional in a function?
Certainly! Here's a simple example:
std::optional<int> findValue(int key) {
if (keyExists(key)) {
return getValue(key);
}
return std::nullopt;
}
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