CallFunctionInHigherClass

...
#import "class2.h"
class Class1 {

public:
    void read(){ //for each person...
        Class2* person = new Class2(foo.item(i));
            m_peopleList.push_back(person);}
    static void increaseTotalPeople(){++m_totalppl;}
    static int m_totalppl; //Cumm. total of the people

private:
    vector<Class2*> m_peopleList;

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//Class 2 In a seperate file
class Class2 {

public:
    Class2(QTDomNode *node)
    { ...

        Class1::increaseTotalPeople();
    }
};