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C++17 in Detail: A Deep Dive

Modifiers & Limitations

To further specify the nature of our structured bindings, we can use modifier types.

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Several modifiers can be ​used with structured bindings.

const modifiers:

C++
const auto [a, b, c, ...] = expression;

References:

C++
auto& [a, b, c, ...] = expression;
auto&& [a, b, c, ...] = expression;

For example:

C++ 17
#include <iostream>
using namespace std;
int main() {
  std::pair a(0, 1.0f);
  auto& [x, y] = a;
  x = 10; // write access
  std::cout << a.first;// a.first is now 10
}

In the example, x binds to the element in the generated object, that is a reference to a.

Now it’s also quite easy to get a reference to a tuple member: ...