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Showing content from https://cplusplus.com/reference/valarray/exp/ below:

function template

std::exp

template<class T> valarray<T> exp (const valarray<T>& x);

Compute exponential of valarray elements

Returns a valarray object containing the exponential function values of all the elements of x, in the same order.

The function calls exp (unqualified) once for each element.

This function overloads cmath's exp.

Parameters

x: valarray containing elements of a type for which the unary function exp is defined.

Return value A valarray object with the exponential function values of the elements of x.

Example

// exp valarray example
#include <iostream>     // std::cout
#include <cstddef>      // std::size_t
#include <cmath>        // std::exp(double)
#include <valarray>     // std::valarray, std::exp(valarray)

int main ()
{
  double val[] = {1.1, 2.2, 4.4, 8.8};
  std::valarray<double> foo (val,4);

  std::valarray<double> bar = exp (foo);

  std::cout << "foo:";
  for (std::size_t i=0; i<foo.size(); ++i)
    std::cout << ' ' << foo[i];
  std::cout << '\n';

  std::cout << "bar:";
  for (std::size_t i=0; i<bar.size(); ++i)
    std::cout << ' ' << bar[i];
  std::cout << '\n';

  return 0;
}

Output:

foo: 1.1 2.2 4.4 8.8
bar: 3.00417 9.02501 81.4509 6634.24