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

std::valarray<T>::resize - cppreference.com

Resizes the valarray to contain count elements and assigns value to each element.

This functions invalidates all pointers and references to elements in the array.

[edit] Parameters count - new size of the container value - the value to initialize the new elements with [edit] Return value

(none)

[edit] Example
#include <iostream>
#include <valarray>
 
int main()
{
    std::valarray<int> v{1, 2, 3};
    v.resize(10);
    for (int n : v)
        std::cout << n << ' ';
    std::cout << '\n';
}

Output:

[edit] See also returns the size of valarray
(public member function) [edit]

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