std::valarray<T>::apply

Returns a new valarray of the same size with values which are acquired by applying function func to the previous values of the elements.

# Declarations

valarray<T> apply( T func(T) ) const;

valarray<T> apply( T func(const T&) ) const;

# Parameters

# Return value

The resulting valarray with values acquired by applying function func.

# Notes

The function can be implemented with the return type different from std::valarray. In this case, the replacement type has the following properties:

# Example

#include <cmath>
#include <iostream>
#include <valarray>
 
int main()
{
    std::valarray<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    v = v.apply([](int n) -> int
                {
                    return std::round(std::tgamma(n + 1));
                });
    for (auto n : v)
        std::cout << n << ' ';
    std::cout << '\n';
}

# See also