xml.h

#pragma once

#include <istream>
#include <sstream>
#include <vector>
#include <string>
#include <string_view>
#include <unordered_map>
using namespace std;

class Node {
public:
  Node(string name, unordered_map<string, string> attrs);

  const vector<Node>& Children() const;
  void AddChild(Node node);
  string_view Name() const;

  template <typename T>
  T AttributeValue(const string& name) const;

private:
  string name;
  vector<Node> children;
  unordered_map<string, string> attrs;
};

class Document {
public:
  explicit Document(Node root);

  const Node& GetRoot() const;

private:
  Node root;
};

Document Load(istream& input);




template <typename T>
inline T Node::AttributeValue(const string& name) const {
  istringstream attr_input(attrs.at(name));
  T result;
  attr_input >> result;
  return result;
}