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Showing content from https://en.cppreference.com/w/cpp/language/../keyword/../numeric/valarray/deduction_guides.html below:

deduction guides for std::valarray - cppreference.com

#include <iostream>
#include <valarray>
 
int main()
{
    int a[] = {1, 2, 3, 4};
    std::valarray va(a, 3); // uses explicit deduction guide
    for (int x : va)
        std::cout << x << ' ';
    std::cout << '\n';
}

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