What are use cases for structured bindings?

Can you provide some other, possibly less obvious use cases for structured bindings? How else can they improve readability or even performance of C++ code?

More in general, you can use it to (let me say) unpack a structure and fill a set of variables out of it:

struct S { int x = 0; int y = 1; };

int main() {
    S s{};
    auto [ x, y ] = s;
    (void)x, void(y);
}

The other way around would have been:

struct S { int x = 0; int y = 1; };

int main() {
    S s{};
    auto x = s.x;
    auto y = s.y;
    (void)x, void(y);
}

The same is possible with arrays:

int main() {
    const int a[2] = { 0, 1 };
    auto [ x, y ] = a;
    (void)x, void(y);
}

Anyway, for it works also when you return the structure or the array from a function, probably you can argue that these examples belong to the same set of cases you already mentioned.

---

Another good example mentioned in the comments to the answer by @TobiasRibizel is the possibility to iterate through containers and unpack easily the contents.
As an example based on std::map:

#include <map>
#include <iostream>

int main() {
    std::map<int, int> m = {{ 0, 1 }, { 2, 3 }};
    for(auto &[key, value]: m) {
        std::cout << key << ": " << value << std::endl;
    }
}