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Which loop form avoids copying elements when iterating a container of large objects?

A for (auto x : container)
B for (const auto& x : container)
C for (int i = 0; i < n; i++)
D for (auto* x : container)

Answer

for (const auto& x : container)

Binding by const reference avoids a copy per element while preventing modification. Plain auto copies each element.

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