How do i alter an element in the set for example how do i edit the 'm_a' member variable of a element in my set?

class CPerson
    int m_a;

    CPerson(int _a)
        m_a = _a;

set<CPerson*> myPersonSet;
set<CPerson*>::iterator it = myPersonSet.find( CPerson(20) );

// How do i change the value of the object i found in my list once i found it and it's referenced by my iterator?

You aren't showing enough code. What is the element that defines the set member? Is that being changed?

(*it)->m_a = 10;

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