Is there a compact equivalent to Python range() in C++/STL

Question

How can I do the equivalent of the following using C++/STL? I want to fill a std::vector with a range of values [min, max).

# Python
>>>         


        

Answer 1

I ended up writing some utility functions to do this. You can use them as follows:

auto x = range(10); // [0, ..., 9]
auto y = range(2, 20); // [2, ..., 19]
auto z = range(10, 2, -2); // [10, 8, 6, 4]

The code:

#include 
#include 

template 
std::vector range(IntType start, IntType stop, IntType step)
{
  if (step == IntType(0))
  {
    throw std::invalid_argument("step for range must be non-zero");
  }

  std::vector result;
  IntType i = start;
  while ((step > 0) ? (i < stop) : (i > stop))
  {
    result.push_back(i);
    i += step;
  }

  return result;
}

template 
std::vector range(IntType start, IntType stop)
{
  return range(start, stop, IntType(1));
}

template 
std::vector range(IntType stop)
{
  return range(IntType(0), stop, IntType(1));
}