What are use cases for structured bindings?

Question

C++17 standard introduces a new structured bindings feature, which was initially proposed in 2015 and whose syntactic appearance was widely discussed later.

Some use

Answer 1

Initializing multiple variables of different types in an if statement; for instance,

if (auto&& [a, b] = std::pair { std::string { "how" }, 4U }; a.length() < b)
   std::cout << (a += " convenient!") << '\n';