fill_indices.cpp

#include <vector>
#include <algorithm>
#include <iterator>
#include <iostream>

int main(int argc, char* argv[]) {
    std::vector<int> indices(1e6);
    /*
    std::transform(indices.begin(),indices.end(), indices.begin(), [&indices](int& v) -> int {
            return std::distance(indices.data(),&v);
            });
    */
    /*
    std::for_each(indices.begin(),indices.end(), [&indices](int& v) {
            v = std::distance(indices.data(),&v);
            });
    */
    std::iota(indices.begin(),indices.end(),0);
    for(auto&& v: indices) {
        std::cout << v << " ";
    }
    std::cout << std::endl;
    return 0;
}