From 55c236be1905c3b237f49399c6fe39c7b108fa08 Mon Sep 17 00:00:00 2001
From: Muh Yusuf <yusufmuhyusuh@gmail.com>
Date: Thu, 11 Sep 2025 08:08:40 +0700
Subject: [PATCH] feat: menambahkan variant iterator

---
 iterator/variant_iterator.cpp | 53 +++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 iterator/variant_iterator.cpp

diff --git a/iterator/variant_iterator.cpp b/iterator/variant_iterator.cpp
new file mode 100644
index 0000000..5aab72f
--- /dev/null
+++ b/iterator/variant_iterator.cpp
@@ -0,0 +1,53 @@
+#include <iostream>
+#include <iterator>
+#include <vector>
+#include <forward_list>
+#include <list>
+void _input_iterator(){ // dipakai untuk input
+    std::cout << "masukkan 3 angka: ";
+    std::istream_iterator<int> input_it(std::cin); //baca dari cin
+    std::istream_iterator<int>end; //penanda akhir
+
+    std::vector<int>data;   
+    while(input_it != end && data.size() < 3){
+        data.push_back(*input_it); //push back deferencing iterator
+        ++input_it;
+    }
+    std::cout << "data yang dibaca" << std::endl;
+    for(auto x: data){
+        std::cout << x << " ";
+    }
+}  
+void _output_iterator(){ //dipakai untuk menulis data
+    std::vector<int>numbers {1,2,3,4,5};
+    std::ostream_iterator<int> output_it(std::cout," ");
+    for(auto x: numbers){
+        *output_it = x;
+    }
+} 
+void _forward_iterator(){ //bisa maju berkali2 namun tidak bisa mundur
+    //singly linked list container
+    std::forward_list<int> fl = {1,2,3,4,5};
+    std::forward_list<int>::iterator it = fl.begin();
+    while(it != fl.end()){
+        std::cout << *it << std::endl;
+    }
+    //output 1 2 3 4 5
+}
+void _bidirectional_iterator(){ //bisa maju bisa mundur
+    std::list<int>ls = {1,2,3,4,5};
+    std::list<int>::iterator it = ls.begin();
+    ++it; //it menunjuk alamat memory 20 skrg
+    std::cout << "ini it: " << *it << std::endl;
+    --it; //it menunjuk alamat memory 1 sekarang
+    std::cout << "ini it: " << *it << std::endl;
+}
+void _random_acces_iterator(){ //bisa maju mundur dan lompat
+    std::vector<int>v = {1,2,3,4,5};
+    std::vector<int>::iterator it = v.begin();
+    std::cout << *(it + 3); //output adlah 4
+}
+int main(){
+    _bidirectional_iterator();
+    return 0;
+}
\ No newline at end of file