template< class T >
concept tuple-like = /* see below */;
2) pair-like objects are tuple-like objects with exactly 2 elements.
tuple-like types implement the tuple protocol, i.e., such types can be used with std::get, std::tuple_element and std::tuple_size.
Elements of tuple-like types can be bound with structured binding.
tuple-like and pair-like are used in the following standard library components:
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