>>107147609 (OP)
The code you provided is a C++ program that uses a range-based for loop with a type variable to iterate over an std::array<int, 3> object named arr. Let's break down the code and understand its functionality:
cpp
std::array<int, 3> arr = {4, 2, 0};
This line declares and initializes an std::array named arr with 3 elements. The elements are initialized with the values 4, 2, and 0.
cpp
for (using elem_t = decltype(arr)::value_type; elem_t i : arr) {
This is a range-based for loop that iterates over the elements of arr.
decltype(arr)::value_type is used to deduce the type of each element in the array. In this case, it will be int because arr is an std::array<int, 3>.
elem_t is a type variable that is used as the type for the loop variable i.
i is the loop variable that will be used to access each element of arr in each iteration.
cpp
std::cout << i << endl;
This line prints the value of each element i in the range-based for loop.
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}
This line marks the end of the range-based for loop.
When you run this code, it will output:
text
4
2
0
The range-based for loop iterates over each element of arr and prints its value using the loop variable i.
In summary, the code declares an std::array with three elements and then iterates over each element using a range-based for loop, printing each element on a separate line.
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