C++ Lambda Expression Passed to a Function

#include <iostream>
#include <vector>

// Put the change<F>() template definition here...

int main() {/*w  ww. j a v a  2s .  c  om*/
  auto cube = [](double value) -> double { return value*value*value; };
  auto average = [](const std::vector<double>& v) -> double
                 {
                   double sum{};
                   for (auto x : v)
                     sum += x;
                   return sum / v.size();
                 };

  std::vector<double> data {1.5, 2.5, 3.5, 4.5, 5.5};

  std::cout << "Average of values in data is " << average(data) << std::endl;

  change(data, [](double x){ return (x + 1.0)*(x + 2.0); });           // Direct lambda argument

  std::cout << "Average of changed values in data is " << average(data) << std::endl;

  std::cout << "Average of cubes of values in data is " << average(change(data, cube)) << std::endl;
}