vector functions c 2b 2b

1#include <vector>
2std::vector<std::string> x;

1                   /*Member functions*/
2                 Iterators
3 -----------------------------------------
4 begin | Returns an iterator to the beginning
5 end   | Returns an iterator to the end
6  
7                 Capacity
8 -----------------------------------------
9 empty    | Checks whether the container is empty
10 size     | Returns the number of elements
11 reserve  | Reserves storage
12 capacity | Returns the number of elements that can be held in currently allocated storage
13     
14              Element access
15 -----------------------------------------
16 at	     	| Access specified element with bounds checking
17 front  	| Access the first element
18 back   	| Access the last element
19 operator[] | Access specified element
20    
21                 Modifiers
22 -----------------------------------------
23 clear        | Clears the contents
24 insert       | Inserts elements
25 emplace      | Constructs element in-place
26 erase        | Erases elements
27 push_back    | Adds an element to the end
28 emplace_back | Constructs an element in-place at the end  
29 pop_back     | Removes the last element        
30 resize       | Changes the number of elements stored     
31 swap         | Swaps the contents
32  
33  *Notes*
34  - https://en.cppreference.com/w/cpp/container/vector
35  - https://www.geeksforgeeks.org/vector-in-cpp-stl/
36  - https://www.tutorialspoint.com/cpp_standard_library/vector.htm

1vector<int> g1; 
2  
3    for (int i = 1; i <= 5; i++) 
4        g1.push_back(i); 
5  
6    cout << "Output of begin and end: "; 
7    for (auto i = g1.begin(); i != g1.end(); ++i) 
8        cout << *i << " "; 
9  
10    cout << "\nOutput of cbegin and cend: "; 
11    for (auto i = g1.cbegin(); i != g1.cend(); ++i) 
12        cout << *i << " "; 
13  
14    cout << "\nOutput of rbegin and rend: "; 
15    for (auto ir = g1.rbegin(); ir != g1.rend(); ++ir) 
16        cout << *ir << " "; 
17  

1template < class T, class Alloc = allocator<T> > class vector;
2

1#include <iostream>
2#include <vector>
3
4class Object
5{
6	public:
7		Object()
8		{}
9		~Object()
10		{}
11		void AddInt(int num)
12		{
13			m_VectorOfInts.push_back(num);
14		}
15		std::vector<int> GetCopyOfVector()
16		{
17			return m_VectorOfInts;
18		}
19		void DisplayVectorContents()
20		{
21			for( unsigned int i = 0; i < m_VectorOfInts.size(); i++ )
22			{
23				std::cout << "Element[" << i << "] = " << m_VectorOfInts[i] << std::endl;
24			}
25			std::cout << std::endl;
26		}
27
28	private:
29		std::vector<int> m_VectorOfInts;
30};
31
32int main()
33{
34	// Create our class an add a few ints
35	Object obj;
36	obj.AddInt(32);
37	obj.AddInt(56);
38	obj.AddInt(21);
39
40	// Display the vector contents so far
41	obj.DisplayVectorContents();
42
43	// Creates a copy of the classes container you can only really view whats in 
44	// the classes vector container. What ever changes you make here wont effect the class.
45	std::vector<int> container1 = obj.GetCopyOfVector();
46	// These elements wont be added as it's a copy of the container
47	container1.push_back(342);
48	container1.push_back(64);
49	container1.push_back(123);
50
51
52	// Display the classes container to see show nothing was added.
53	obj.DisplayVectorContents();
54
55	return 0;
56}