Example

class CClass
{
public:
    CClass( int* _piValue ) :
        m_piValue( _piValue )
    {}

    void SetValue( int* _piValue )
    {
        this->m_piValue = _piValue;
    }

private:
    int*    m_piValue;
}

int main()
{
    int iValueA = 5;
    int iValueB = 6;

    CClass cls{ &iValueA };
    cls.SetValue( &iValueB );

    return ( 0 );
}