In C++ 11, you cannot use a range-based for loop to modify the contents of an array unless you declare the range variable as a reference.

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In C++ 11, modifying the contents of an array using a range-based for loop requires declaring the range variable as a reference. Without the reference, the loop operates on a copy of the array elements, and any changes made in the loop do not affect the original array.

In C++ 11, You Cannot Use a Range-Based for Loop