Init

ACMOJ-2059.h

@@ -0,0 +1,86 @@
+#include <iostream>
+#include <map>
+#include <string>
+
+class Student {
+ public:
+  static std::map<int, Student *> id2student;
+  static std::map<std::string, Student *> name2student;
+  enum class Gender { Boy, Girl };
+
+ private:
+  int id;
+  std::string name;
+  int age;
+  Gender gender;
+
+ public:
+  // 从输入流构造
+  // 输入格式与输出格式一致
+  // 输出函数已给出
+  Student(std::istream &is) {
+    std::string tmp_gender;
+    is >> id >> name >> age >> tmp_gender;
+    if (tmp_gender == "boy")
+      gender = Gender::Boy;
+    else
+      gender = Gender::Girl;
+    id2student[id] = this;
+    name2student[name] = this;
+  }
+
+  // 人无法被复制（至少不应该）
+  Student(Student const &rhs) = delete;
+  Student &operator=(Student const &rhs) = delete;
+  // 你需要支持的操作
+  Student(Student &&rhs) {
+    id = rhs.id;
+    name = rhs.name;
+    age = rhs.age;
+    gender = rhs.gender;
+    rhs.id = 0;
+    id2student[id] = this;
+    name2student[name] = this;
+  }
+  Student &operator=(Student &&rhs) {
+    if ((&rhs) != this) {
+      if (id != 0) {
+        id2student.erase(id);
+        name2student.erase(name);
+      }
+      id = rhs.id;
+      name = rhs.name;
+      age = rhs.age;
+      gender = rhs.gender;
+      rhs.id = 0;
+      id2student[id] = this;
+      name2student[name] = this;
+    }
+    return *this;
+  }
+  ~Student() {
+    if (id != 0) {
+      id2student.erase(id);
+      name2student.erase(name);
+    }
+  }
+
+  Student &rename(std::string const &str) & {
+    name2student.erase(name);
+    name = str;
+    name2student[name] = this;
+    return *this;
+  }
+  Student rename(std::string const &str) && {
+    name2student.erase(name);
+    name = str;
+    name2student[name] = this;
+    Student tmp(std::move(*this));
+    return std::move(tmp);
+  }
+
+  friend std::ostream &operator<<(std::ostream &os, Student &stu) {
+    return os << stu.id << ' ' << stu.name << ' ' << stu.age << ' '
+              << (stu.gender == Student::Gender::Boy ? "boy" : "girl");
+  }
+};