C++聚合关系类的构造函数的调用顺序详解

#pragma once
class Engine
{
public:
  Engine();
  ~Engine();
};
Engine.h

#include <iostream>
#include "Engine.h"
using namespace std;

Engine::Engine()
{
  cout << "调用构造函数:Engine()" << endl;
}

Engine::~Engine()
{
  cout << "调用析构函数:~Engine()" << endl;
}
Engine.cpp

#pragma once
#include "Engine.h"

class Car
{
public:
  Car();
  ~Car();
private:
  Engine m_eCar;
};
Car.h

#include <iostream>
#include "Car.h"
using namespace std;

Car::Car()
{
  cout << "调用构造函数:Car()" << endl;
}

Car::~Car()
{
  cout << "调用析构函数:~Car()" << endl;
}
Car.cpp