[SOLVED] Passing class to itself (CPP)

brazilnut · 05-18-2010, 05:22 AM

Hi,

I'm struggling with the issue of passing a vector of a class to itself, here's what state its in now... (tried many variations, but without direction).

Code:

#include <iostream>
#include <string>
#include <vector>

//	g++ classes.cpp -o run

using namespace std;

class node {
	public:
		string name;
		node()	{	name = "test";	}
		int check(vector <node*> *n)
		{
			int tot = n->size();
			for(int i=0;i<tot;i++) {
				cout << "name: " << n[i]->name << endl;
			}
		}
};

int main(int argc, char* argv[])
{
	std::vector <node*> e;
	
	node *n = new node();
	
	e.push_back(n);
	e.push_back(new node());
	e.push_back(new node());
	
	int ret e[0]->check(&e);
	return 0;

}

I'm guessing it will be possible, but... Any help or direction greatly appreciated, so would a college (uni) course... Bang bang...

posixculprit · 05-18-2010, 05:43 AM

Code:

int check(vector <node*> *n)

`n` is a pointer to a std::vector<node*>. Because of this, you can't access its elements as n[i], you have to dereference it first: (*n)[i]. However, why use a pointer in the first place? I'm guessing it is because you wish to not copy the whole vector. A better way (IMO) would be:

Code:

int check(const vector<node *> &n)

Also, even though you've declared `check` to return int, the function returns no value. Also, why is `check` a member of class `node` in the first place? You're also missing an equals sign on the line:

Code:

int ret e[0]->check(&e);

brazilnut · 05-18-2010, 05:53 AM

Thanks, i'll have a read up on dereferencing and pointers in general.

The obvious errors are because I quickly made this example to demonstrate my issue, err...

Once again, many thanks!