$//$ inserts "value" before "pos" $--$ returns iterator pointing to newly inserted element

$//[4]$

iterator

insert $($iterator pos, const value$\_$type& value$)$

$\{$

$//$TO FIX

$//$ Hint: create a new Node and "hook" it in place

$//$ someNode$->$hook$($newNode$)$;

$\}$

$//$ inserts an element at the end of the list

$//[2]$

void

push$\_$back $($const value$\_$type& value$)$

$\{$

$//$TO FIX

$//$ Hint: could be one$-$line call to insert$()$

$\}$

$//$ inserts an element at the front of the list

$//[2]$

void

push$\_$front $($const value$\_$type& value$)$

$\{$

$//$TO FIX

$//$ Hint: could be one$-$line call to insert$()$

$\}$

$//$ erase element pointed to by "pos" $--$ returns iterator to next element

$//[4]$

iterator

erase $($iterator pos$)$

$\{$

$//$TO FIX

$//$ Hint: call unhook on the correct ListNode and delete it

$\}$

Please help me with this, and do NOT use ListNode$*$ node $=$ as that does not work.