C++ 11 range-based for loop

Sep 15, 2016Download as pptx, pdf1 like1,099 views

mohamed sikander

C++ 11 has provided Range based for Loop which makes programming easy. This document discusses about those loops

Mohammed Sikander
Tech Lead
CRANES SOFTWARE
mohammed.sikander@cranessoftware.com

Applying Range Based For loop –
• Fixed Size Arrays
• Vector and List
• Array
2
C++11: Range Based For Loop

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
}

Can modify the elements of container.
Does not make copy of elements.
Is faster.
C++11: Range Based For Loop
8

Cannot traverse a part of list.
Cannot traverse in reverse order.
Cannot be applied to pointers.
C++11: Range Based For Loop
12

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
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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

#5: #include <iostream> using namespace std; int main() { int arr[5] = {5 , 10 , 12, 20 , 40}; for(int i : arr) cout << i << endl; return 0; }
#6: #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; }
#7: #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; }
#8: #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; }
#9: 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; }
#10: #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; }
#11: #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 << ' '; }
#12: #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; }
#14: #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(); }

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Editor's Notes