string parsing for C++

string parsing for C++

I have a text file that has #'s in it...It looks something like this.
#Stuff
1
2
3
#MoreStuff
a
b
c
I am trying to use std::string::find() function to get the positions of
the # and then go from there, but I'm not sure how to actually code this.
This is my attempt:
int pos1=0;
while(i<string.size()){
int next=string.find('#', pos1);
i++;}