Thread: trying to pass a array of a class

Code:

#include <iostream>
#include <vector>

std::vector<monster> monsters;

void AddMonster(int hps) {
	monster m;
	m.m_hps = hps;

	monsters.push_back(m);
}

void DisplayAll() {
	std::vector<monster>::iterator itr;

	for (itr = monsters.begin(); itr != monsters.end(); ++itr )
		std::cout "This monster's health is: " << itr.m_hps << std::endl;
}
int main() {
	AddMonster(10);
	AddMonster(43);
	AddMonster(25);
	AddMonster(12);

	DisplayAll();

	return 0;
}

Code:

void displayAllMonsterHealth(monster *mon, size_t size){
  for( int i = 0; i < size; ++i)
    cout << mon[i].m_hps << endl;
}

Pass your mon variable for mon, and 4 for size.

And don't listen to nicoqwertyu. No need for global variables here.

And I agree with vectors over passing pointer + size.
A vector will basically be your array. Then all your functions can take the vector by reference and it'll all work out a you want.

Originally Posted by morngrym

thanks for your help, i will go and learn to pass my array into my function as a vector, i will look for a tutorial on this but if you have any suggestions of where some "good" tutorials on this are that would be great too.

thanks again

Online tutorial are insufficient for learning C++. You really need a book.

The suggestion is not to pass your array as a vector, but to use a vector in place of your array. Nicoqwertyu's code does correctly show how vectors are used. _Mike explains how to declare a function that takes a vector as a reference, so you do not have to use a global.

If you want to use an array, use my code. Note that I fixed an error in it. Principally it's more versatile, since you can pass a vector as a pointer, but not an array as a vector. But vectors are more important to learn than arrays.