Problem example

child.h

#pragma once
#include "parent.h"

struct child
{
	void live(parent* p) { p->money -= 100; }
};

parent.h

#pragma once
#include <vector>

#include "child.h"


struct parent
{
	int money = 200000;
	std::vector<child> children;

	void life() { for (int i = 0; i < children.size(); i++) children[i].live(this); }



};

Source.cpp

#include "parent.h"
#include <iostream>

int main()
{
	parent Eric;
	Eric.children.push_back(child());
	Eric.children.push_back(child());
	Eric.children.push_back(child());
	Eric.children.push_back(child());


	std::cout << Eric.money << std::endl;
	Eric.life();
	std::cout << Eric.money << std::endl;

	system("PAUSE");



}