///
ParagraphList();
///
+ iterator insert(iterator it, Paragraph * par);
+ ///
void clear();
///
+ void erase(iterator it);
+ ///
iterator begin();
///
iterator begin() const;
///
void set(Paragraph *);
///
+ void push_back(Paragraph *);
+ ///
+ Paragraph const & front() const;
+ ///
+ Paragraph & front();
+ ///
+ Paragraph const & back() const;
+ ///
+ Paragraph & back();
+ ///
int size() const;
///
bool empty() const;