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vector of objects, deleting

j0nte33 (6)
Hi there! i am messing around with vector and classes, and with this program i wrote, i don't understand what is wrong. You can make a new object by pressing 1. and by pressing 2 you *SHOULD* delete all the objects with the name you enter. But it seems like only half of the objects gets deleted!

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 #include "stdafx.h"
#include <iostream>
#include <string>
#include <vector>
using namespace std;

class monster
{
public:
	monster()
	{
		level = 100;
		name = "santa";
	};
	~monster(){};
	string getName()
	{
		return name;
	}

private:
	int level;
	string name;
};

int main()
{
	vector<monster>v;
	int answer=0;//what to do in menu answer
	while(1)
	{
		cout <<"__________MENU__________"<<endl;
		cout <<"1: create new class" << endl ;
		cout <<"2: delete class #by name" << endl;
		cout <<"_______________________"<< endl;
		cout <<"#######################"<< endl;
		cout << "there are: "<<v.size() << " classes" << endl;
		cout <<"#######################"<< endl;
		cin >>answer;
		system("cls");

		if(answer ==1)
		{
			monster *obj_m;
			obj_m = new monster;
			v.push_back(*obj_m);
			delete obj_m;
			system("cls");
		}
		if(answer==2)
		{
			string tmp_answer;//wich class is going to be deleted?
			int times=0;//counts how many objects has been deleted
			cout <<"name of class/classes to delete: "<< endl;
			cin >> tmp_answer;
			system("cls");
			
			for(unsigned int i=0;i < v.size();i++)
			{
				if(tmp_answer == v[i].getName())
				{
					v.erase(v.begin()+i);
					times++;
				}
			}
			if(times > 0)
			{
				cout <<"============================"<< endl;
				cout <<"amount of objects deleted: " << times << endl;
				cout <<"============================"<< endl;
			}
			else
			{
				cout <<"=============================="<< endl;
				cout <<"there where no objects deleted" << endl;
				cout <<"=============================="<< endl;
			}

		}
		if(answer==-1)
		{
			return 0;
		}	
     }
	return 0;
}
coder777 (8444)
But it seems like only half of the objects gets deleted!
The reason for this is that you must not increase i after you erased an element. The element i+1 becomes the element i
j0nte33 (6)
Oh right! I understand what went wrong now! Thanks :)
Last edited on
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