c++ - How to know if a std::list has been modified -

possible duplicate:
create std::list of value instead of std::list of pointers in recursive function

i have class:

class c { public: c* parent; std::list<c> children; }; 

i can use class in way example:

c root; c child; root.children.push_back(child); // or other method of std::list (es: push_front, insert, ...) // here child.parent root // how can set parent of child? 

i want work internally class without losing functionality of std::list, possible?

if understanding question correctly, want this:

class c { public: c* parent; std::list<c *> children; explicit c(c *p = 0) : parent(p) { if (p) p->children.push_back(this); } }; c root; c child(&root); 

note changed children list take pointers. fine long c not expected manage memory nodes, refer them.

the title of question was: how know if std::list has been modified. comments, seems want proxy:

class listproxy { std::list<c *> children; public: // replicate list traits // ... void push_back (c *c) { children.push_back(c); //... } void erase (iterator i) { children.erase(i); //... } //... }; 

the proxy delegates list functionality list, augments behavior methods change list.

class c { public: c* parent; listproxy children; explicit c(c *p = 0) : parent(p) { if (p) p->children.push_back(this); } };