valarray::apply


public member function
valarray<T> apply (T func(T)) const;
valarray<T> apply (T func(const T&)) const;

Apply function

Returns a valarray with each of its elements initialized to the result of applying func to its corresponding element in *this.

The valarray returned has the same length as *this.

Parameters

func
Pointer to a function taking an argument of type T (or a constant reference) and returning T.
T is the template type of valarray (the elements' type).


Return value

A valarray object with the results of applying func to all the elements of *this.

Example

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// valarray::apply example
#include <iostream>
#include <valarray>
using namespace std;

int increment (int x) {return ++x;}

int main ()
{
  int init[]={10,20,30,40,50};
  valarray<int> foo (init,5);

  valarray<int> bar = foo.apply(increment);

  for (size_t n=0; n<bar.size(); n++)
	  cout << bar[n] << ' ';
  cout << endl;

  return 0;
}


Output:

11 21 31 41 51


See also

valarray::operator= Assign content (public member function)
valarray operators Valarray operators (functions)