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What does structured binding in C++17 allow?

A Decomposing a pair, tuple or struct into named variables in one declaration
B Binding a reference to a temporary
C Linking against multiple libraries
D Binding a lambda to a thread

Answer

Decomposing a pair, tuple or struct into named variables in one declaration

Writing auto [key, value] = pair is far clearer than accessing .first and .second, especially when iterating a map.

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