stl iterator

1#include <iostream>
2#include <vector>
3using namespace std;
4
5vector<int> myvector;
6
7for (vector<int>::iterator it = myvector.begin();
8     it != myvector.end();
9     ++it)
10   cout << ' ' << *it;
11cout << '\n';
12

1// EXAMPLE
2vector<string> vData;
3vData.push_back("zeroth");
4vData.push_back("first");
5vData.push_back("second");
6vData.push_back("third");
7
8std::vector<string>::iterator itData;
9
10for (itData = vData.begin(); itData != vData.end() ; itData++)
11{
12  auto ElementIndex = itData-vData.begin();
13  auto ElementValue = vData[ElementIndex]; // vData[ElementIndex] = *itData
14  cout << "[ElementIndex:" << ElementIndex << "][ElementValue:" << ElementValue << "]\n";
15}
16
17/* HEADER(S)
18#include <vector>
19#include <iostream>
20using namespace std;
21*/

1#include <iostream>
2#include <algorithm>
3 
4template<long FROM, long TO>
5class Range {
6public:
7    // member typedefs provided through inheriting from std::iterator
8    class iterator: public std::iterator<
9                        std::input_iterator_tag,   // iterator_category
10                        long,                      // value_type
11                        long,                      // difference_type
12                        const long*,               // pointer
13                        long                       // reference
14                                      >{
15        long num = FROM;
16    public:
17        explicit iterator(long _num = 0) : num(_num) {}
18        iterator& operator++() {num = TO >= FROM ? num + 1: num - 1; return *this;}
19        iterator operator++(int) {iterator retval = *this; ++(*this); return retval;}
20        bool operator==(iterator other) const {return num == other.num;}
21        bool operator!=(iterator other) const {return !(*this == other);}
22        reference operator*() const {return num;}
23    };
24    iterator begin() {return iterator(FROM);}
25    iterator end() {return iterator(TO >= FROM? TO+1 : TO-1);}
26};
27 
28int main() {
29    // std::find requires an input iterator
30    auto range = Range<15, 25>();
31    auto itr = std::find(range.begin(), range.end(), 18);
32    std::cout << *itr << '\n'; // 18
33 
34    // Range::iterator also satisfies range-based for requirements
35    for(long l : Range<3, 5>()) {
36        std::cout << l << ' '; // 3 4 5
37    }
38    std::cout << '\n';
39}

1vector<int>::iterator ptr;