C++聚合关系类的构造函数的调用顺序详解

#pragma onceclass 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