Thread: classes and members

im going to explain this to you all as clear as possible, forgive me if it looks like garbage.English is not my native langauge.

ok, i have a class called Client. Now client has many data members (like Computer serial,color) etc. Now i want 1 client to be able to book in more than one computer (unlimited would be nice) Anyway how do i get a client to have unlimited computers booked in?? If you dont understand please just ask me.

Thanks in advance.


in other words to declare data memebers in a single object dinamically

Code:

class bookings
{
//you fill this out
};

class client
{
public:
   // your funcs
   // funcs to deal with the vector of bookings
private:
   std::vector<bookings> _mybookings;
   // rest of your members
};

You mean something like that?

I'll google vectors to see what i can come up with, i dont know about vectors, maybe im in too deep

You need a container that can dynamically grow and shrink. While Arrays ( even if dynamically allocated ) always have a static size, linked lists are the first example class that will hold a variable and varying number of entries.

The standard library has some classes to handle this. vector and list come to mind.

I'll google vectors to see what i can come up with, i dont know about vectors, maybe im in too deep

You can use vectors just like arrays--except they have no fixed size. The basics are very easy to learn. Here's some of the basics using ints as the elements of the vector:

Code:

#include <iostream>
#include <vector> /***/

using namespace std;

int main()
{
	vector<int> numbers(3); //declare a vector of ints with size 3
	numbers[0] = 10;
	numbers[1] = 20;
	
	cout<<numbers.size()<<endl; //3
	
        numbers[2] = 30;

	for(int i = 0; i<3; i++)
	{
		cout<<numbers[i]<<endl;
	}
	
	numbers.push_back(40); //used to expand the size of the vector
	cout<<numbers[3]<<endl;

	cout<<numbers.size()<<endl; //4
	cout<<numbers.capacity()<<endl; //6

	return 0;
}

push_back() :
Adds the argument to the end of the vector, expands the vector if necessary.

size() :
If you declare the size of a vector, size() will return that number--even if there are fewer elements. Otherwise, size() will return the actual number of elements in the vector.

capacity():
Internally, it is inefficient to expand a vector's size by just 1 every time, so a vector automatically expands its size to something bigger. capacity() gives you the room available before the vector will have to be resized again.

I don't think you'll need anything more than that to write your program.