Разработать класс

#include <cstddef>
#include <cstdio>
#include <vector>
 
using std::vector;
 
class Record {
 public:
  int a_;
  double b_;
  Record() : a_(0), b_(0) {}
  Record(int a, double b) : a_(a), b_(b) {}
};
 
class TreeBranch {
 public:
  TreeBranch(char *name) : name_(name) {}
  char *name() const { return name_; }
  vector<TreeBranch> branches;
  vector<Record> leafs;
 private:
  char *name_;
};
 
void display_spaces(int number_of_spaces, int tab) {
  for (int i = 0; i < number_of_spaces/tab; ++i) {
    printf("|");
    for (int j = 0; j < tab-1; ++j)
      printf(" ");
  }
}
 
void display_tree(const TreeBranch& tree, int number_of_spaces = 0, int tab = 2) {
  printf("+%s\n", tree.name());
  for (size_t i = 0; i < tree.branches.size(); ++i) {
    display_spaces(number_of_spaces+tab, tab);
    display_tree(tree.branches[i], number_of_spaces+tab);
  }
  for (size_t i = 0; i < tree.leafs.size(); ++i) {
    display_spaces(number_of_spaces+tab, tab);
    printf("- leaf [%d, %f]\n", tree.leafs[i].a_, tree.leafs[i].b_);
  }
}
 
int main(int argc, char *argv[]) {
  TreeBranch tree("/");
  tree.branches.push_back(TreeBranch("etc"));
  tree.branches.push_back(TreeBranch("bin"));
  tree.branches[1].leafs.push_back(Record(0, 0.1));
  tree.branches[1].leafs.push_back(Record(2, 0.2));
  tree.branches[1].leafs.push_back(Record(4, 0.3));
  tree.branches.push_back(TreeBranch("var"));
  tree.branches.push_back(TreeBranch("usr"));
  tree.branches[3].branches.push_back(TreeBranch("home"));
  tree.branches[3].branches[0].leafs.push_back(Record(1, 1.4));
  tree.branches[3].branches[0].leafs.push_back(Record(1, 1.2));
  tree.branches[3].branches[0].leafs.push_back(Record(1, 1.3));
  tree.branches[3].leafs.push_back(Record(3, 1.0));
  tree.branches[3].leafs.push_back(Record(1, 1.0));
  tree.branches[3].leafs.push_back(Record(3, 1.1));
  tree.leafs.push_back(Record(1, 0.5));
 
  display_tree(tree);
 
  int key;
  scanf("%d", &key);
  return 0;
}