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C++ 11 range-based for loop
- 1. Mohammed Sikander Tech Lead CRANES SOFTWARE mohammed.sikander@cranessoftware.com
- 2. Applying Range Based For loop – • Fixed Size Arrays • Vector and List • Array 2 C++11: Range Based For Loop
- 3. Executes a for loop over a range Used as a more readable equivalent to the traditional for loop operating over a range of values, such as all elements in a container. C++11: Range Based For Loop 3 Syntax : for ( for-range-declaration : expression ) { statement }
- 4. 4 C++11: Range Based For Loop
- 5. 5 C++11: Range Based For Loop
- 6. C++11: Range Based For Loop 6
- 7. 7 C++11: Range Based For Loop
- 8. Can modify the elements of container. Does not make copy of elements. Is faster. C++11: Range Based For Loop 8
- 9. C++11: Range Based For Loop 9
- 10. 10 C++11: Range Based For Loop
- 11. C++11: Range Based For Loop 11
- 12. Cannot traverse a part of list. Cannot traverse in reverse order. Cannot be applied to pointers. C++11: Range Based For Loop 12
- 13. C++11: Range Based For Loop 13
- 14. Range based for loop can be applied on containers to simply the programs. It can be applied on sequence and associative containers. • It can be applied for all containers for which we can apply begin and end algorithm or contains begin and end members functions Cannot be used to traverse part of list. Cannot be applied on pointers. C++11: Range Based For Loop 14
Editor's Notes
- #include <iostream> using namespace std; int main() { int arr[5] = {5 , 10 , 12, 20 , 40}; for(int i : arr) cout << i << endl; return 0; }
- #include <iostream> using namespace std; int main() { double arr[5] = {5.2 , 10.5 , 1.2, 2.3 , 4.5}; for(double i : arr) cout << i << endl; return 0; }
- #include <iostream> using namespace std; int main() { int arr[5] = {5 , 10 , 12, 20 , 40}; for(int ele : arr) ele = ele + 2; for(int ele : arr) cout << ele << endl; return 0; }
- #include <iostream> using namespace std; int main() { int arr[5] = {5 , 10 , 12, 20 , 40}; for(int &ele : arr) ele = ele + 2; for(int ele : arr) cout << ele << endl; return 0; }
- int main() { int arr[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; for(int &ele : arr ) { ele = ele + x; } for( const int &ele : arr ) { cout << ele << " "; } return 0; }
- #include <iostream> using namespace std; int main() { int iarr[5] = { 1, 2, 3, 4, 5}; double darr[5] = {5.2 , 10.5 , 1.2, 2.3 , 4.5}; for(const auto &ele : iarr ) { cout << ele << " "; } cout << endl; for(const auto &ele : darr ) { cout << ele << " "; } return 0; }
- #include <iostream> #include <vector> #include <list> using namespace std; int main() { std::vector<int> v = {0, 7, 2, 3, 4, 5}; for (const auto &ele : v) std::cout << ele << ' '; cout << endl; std::list<int> lst = {8, 6, 4, 2, 1}; for (const auto &ele : lst) std::cout << ele << ' '; }
- #include <iostream> #include <set> #include <map> using namespace std; int main(){ set <int> s; s.insert(10); s.insert(1); s.insert(34); s.insert(23); s.insert(87); for(auto ele : s) cout << ele <<" "; cout << endl; map <int,string> m; m.insert(pair<int,string>(1,"sikander")); m.insert(pair<int,string>(4,"bangalore")); m.insert(pair<int,string>(3,"chennai")); m.insert(pair<int,string>(2,"cranes")); m.insert(pair<int,string>(6,"karnataka")); m.insert(pair<int,string>(5,"tamilnadu")); for(auto ele : m) cout << ele.first <<" " << ele.second << endl; return 0; }
- #include <iostream> #include <vector> #include <map> using namespace std; class Base { public : Base() { } Base(const Base &b) { cout <<"Base Copy Constructor \n"; } virtual void display() { cout <<"Base Display \n"; } }; class Derived : public Base { public : Derived(){} Derived(const Derived &b) : Base(b) { cout <<"Derived Copy Constructor \n"; } virtual void display() { cout <<"Derived Display \n"; } }; int main() { vector < Base *> v; v.push_back((new Base())); v.push_back((new Base())); v.push_back((new Derived())); v.push_back((new Derived())); for(Base *ele : v) ele->display(); }