What are some examples of structured bindings in C++17?

What are some examples of structured bindings in C++17?

Structured bindings in C++17 allow you to unpack tuple-like objects into individual variables. For example, you can use it with std::pair.

Can you show me a code example?

Sure! Here's a simple example:

#include <iostream>
#include <tuple>

std::tuple<int, double, std::string> getData() {
    return {1, 3.14, "Hello"};
}

int main() {
    auto [id, value, message] = getData();
    std::cout << id << " " << value << " " << message << std::endl;
}

This unpacks the tuple into three variables.

What if I want to use it with arrays?

You can use structured bindings with arrays as well. For example:

int arr[3] = {1, 2, 3};
auto [a, b, c] = arr;
std::cout << a << " " << b << " " << c << std::endl;

This will unpack the array into three variables.

Are there any limitations to structured bindings?

Yes, structured bindings can only be used with types that have a defined tuple-like interface, such as tuples, pairs, and arrays. They cannot be used with just any type.