string iterator in c++
// string::begin/end
#include <iostream>
#include <string>
int main ()
{
std::string str ("Test string");
for ( std::string::iterator it=str.begin(); it!=str.end(); ++it)
std::cout << *it << endl;
std::cout << '\n';
return 0;
}Iterator in c++
//Iterator Pointer like Structore in c++ of STL
#include <bits/stdc++.h>
using namespace std;
int main(){
vector<int> v = {1,2,3,4,5};
for(int i = 0; i<v.size(); i++){
cout<<v[i]<<" ";
}
cout<<endl;
vector<int> :: iterator it;
// it = v.begin();
// cout<<(*it+1)<<endl;
for(it = v.begin(); it !=v.end(); ++it){
cout<<(*it)<<endl;
}
cout<<endl;
vector<pair<int, int>> v_p = {{1,2},{3,4},{5,6}};
vector<pair<int ,int>> :: iterator iter;
for(iter = v_p.begin(); iter !=v_p.end(); ++iter){
cout<<(*iter).first<<" "<<(*iter).second<<endl;
}
cout<<endl;
for(iter = v_p.begin(); iter !=v_p.end(); ++iter){
cout<<(iter->first)<<" "<<(iter->second)<<endl;
}
return 0;
}iterator on std::tuple
#include <tuple>
#include <iostream>
#include <boost/hana.hpp>
#include <boost/hana/ext/std/tuple.hpp>
struct Foo1 {
int foo() const { return 42; }
};
struct Foo2 {
int bar = 0;
int foo() { bar = 24; return bar; }
};
int main() {
using namespace std;
using boost::hana::for_each;
Foo1 foo1;
Foo2 foo2;
for_each(tie(foo1, foo2), [](auto &foo) {
cout << foo.foo() << endl;
});
cout << "foo2.bar after mutation: " << foo2.bar << endl;
}Copyright © 2021 Codeinu
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