在目标函数中使用迭代器的STL算法

Question

I want to use an function that requires the parameter to be an Iterator, is possible to apply it with an STL algoritm like std::for_each ?

std::vector<int> v({0,1,2,3,4});
std::for_each(v.begin(), v.end(), [](std::vector<int>::iterator it)
{
   // Do something that require using the iterator
   // .....
});

Answer 1

You could easily make your own "implementation" that passes an iterator to the function.

namespace custom {
template<class InputIterator, class Function>
  Function for_each(InputIterator first, InputIterator last, Function fn)
{
  while (first!=last) {
    fn (first);
    ++first;
  }
  return fn; 
}
}

std::vector<int> v({0,1,2,3,4});
custom::for_each(v.begin(), v.end(),
    [](std::vector<int>::iterator it)
    {
        std::cout << *it << std::endl;
    });

I don't see the advantage of this over a simple loop:

for (auto it = v.begin(); it != v.end(); ++it)