c-array-iterate.cc

#include <iterator>
#include <iostream>


void
int_squares(int c[5])
{
    // won't work because the size of the array is not available
    // when passed to a function because it is treated as a pointer
    std::cerr << "auto it : ..." << '\n';
    int acc = 0;
    for (auto it : c) {
        acc += it;
        std::cerr << it << ' ' << acc << '\n';
    }
}

int
main()
{
    int c_array[] = {1,3,5,7,9};
    int acc = 0;

    std::cerr << "auto it :  with range..." << '\n';
    for (auto it : c_array) {
        acc += it;
        std::cerr << it << ' ' << acc << '\n';
    }

    std::cerr << "auto it = std::begin  ..." << '\n';
    acc = 0;
    for (auto it = std::begin(c_array); it != std::end(c_array); it++) {
        acc += *it;
        std::cerr << *it << ' ' << acc << '\n';
    }

    std::cerr << "old school ..." << '\n';
    acc = 0;
    for (int* it = &c_array[0]; it != &c_array[sizeof c_array / sizeof(int)]; it++) {
        acc += *it;
        std::cerr << *it << ' ' << acc << '\n';
    }
}