C++: What is structured binding in C++17?

1#include <tuple>
2#include <map>
3
4// Array
5int arr[] = {1, 2, 3};
6auto [a, b, c] = arr;
7
8// Pair/Tuple
9std::pair<int, std::string> p = {1, "hello"};
10auto [id, name] = p;
11
12// Struct
13struct Point { int x; int y; };
14Point pt = {10, 20};
15auto [x, y] = pt;
16
17// Map iteration
18std::map<std::string, int> scores = {{"Alice", 95}, {"Bob", 87}};
19for (const auto& [name, score] : scores) {
20    std::cout << name << ": " << score << "\n";
21}
22
23// In if statements
24if (auto [it, inserted] = scores.insert({"Charlie", 90}); inserted) {
25    std::cout << "Inserted\n";
26}