c++ vector iterator
#include <iostream>
#include <vector>
using namespace std;
vector<int> myvector;
for (vector<int>::iterator it = myvector.begin();
it != myvector.end();
++it)
cout << ' ' << *it;
cout << '\n';c++ vector iterator
#include <iostream>
#include <vector>
using namespace std;
vector<int> myvector;
for (vector<int>::iterator it = myvector.begin();
it != myvector.end();
++it)
cout << ' ' << *it;
cout << '\n';c++ vector iterator
// EXAMPLE
vector<string> vData;
vData.push_back("zeroth");
vData.push_back("first");
vData.push_back("second");
vData.push_back("third");
std::vector<string>::iterator itData;
for (itData = vData.begin(); itData != vData.end() ; itData++)
{
auto ElementIndex = itData-vData.begin();
auto ElementValue = vData[ElementIndex]; // vData[ElementIndex] = *itData
cout << "[ElementIndex:" << ElementIndex << "][ElementValue:" << ElementValue << "]\n";
}
/* HEADER(S)
#include <vector>
#include <iostream>
using namespace std;
*/stl iterator
#include <iostream>
#include <algorithm>
template<long FROM, long TO>
class Range {
public:
// member typedefs provided through inheriting from std::iterator
class iterator: public std::iterator<
std::input_iterator_tag, // iterator_category
long, // value_type
long, // difference_type
const long*, // pointer
long // reference
>{
long num = FROM;
public:
explicit iterator(long _num = 0) : num(_num) {}
iterator& operator++() {num = TO >= FROM ? num + 1: num - 1; return *this;}
iterator operator++(int) {iterator retval = *this; ++(*this); return retval;}
bool operator==(iterator other) const {return num == other.num;}
bool operator!=(iterator other) const {return !(*this == other);}
reference operator*() const {return num;}
};
iterator begin() {return iterator(FROM);}
iterator end() {return iterator(TO >= FROM? TO+1 : TO-1);}
};
int main() {
// std::find requires an input iterator
auto range = Range<15, 25>();
auto itr = std::find(range.begin(), range.end(), 18);
std::cout << *itr << '\n'; // 18
// Range::iterator also satisfies range-based for requirements
for(long l : Range<3, 5>()) {
std::cout << l << ' '; // 3 4 5
}
std::cout << '\n';
}Copyright © 2021 Codeinu
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