C++ 自身函数详解及应用：代码生成与反射

std::vector<int> v;
std::generate(std::back_inserter(v), v.end(), []() { return rand() % 10; }, 10);

int i = 0;
std::cout << typeid(i).name() << std::endl; // 输出 "int"

const type_info& t = typeid(i);
std::cout << t.hash_code() << std::endl; // 输出对象的哈希码

#include <iostream>
#include <typeinfo>

struct ISubject {
  virtual void request() = 0;
};

class RealSubject : public ISubject {
  void request() override { std::cout << "RealSubject request" << std::endl; }
};

struct IProxy : public ISubject {
  ISubject* subject;
  IProxy(ISubject* subject) : subject(subject) {}
  void request() override {
    std::cout << "IProxy request: ";
    subject->request();
  }
};

int main() {
  ISubject* subject = new RealSubject();
  ISubject* proxy = new IProxy(subject);

  proxy->request();

  std::cout << "Type of 'proxy': " << typeid(*proxy).name() << std::endl;

  return 0;
}

IProxy request: RealSubject request
Type of 'proxy': IProxy