看了android下的代码,好长时间没看了,有个关于C++的知识点不是很清楚,查了下: 如何使用基类中的赋值运算符? 引述自http://stackoverflow.com/questions/1226634/how-to-use-base-classs-constructors-and-assignment-operator-in-c 参考:<C++ Primer>4ed_CN  p_495 编译器的默认设置: struct base { base() { std::cout <<…

We have discussed assignment operator overloading for dynamically allocated resources here . This is a an extension of the previous post. In the previous post, we discussed that when we don't write our own assignment operator, compiler created assign…

[题目描述] Implement an assignment operator overloading method. Make sure that: The new data can be copied correctly The old data can be deleted / free correctly. We can assign like  A = B = C 实现赋值运算符重载函数,确保: 新的数据可准确地被复制 旧的数据可准确地删除/释放 可进行A = B = C赋值 [题目链…

拷贝构造函数(copy constructor)被用来以一个对象来初始化同类型的另一个对象,拷贝赋值运算符(copy assignment operator)被用来将一个对象中的值拷贝到同类型的另一个对象中: class Widget { public: Widget(); // default constructor Widget(const Widget& rhs); // copy constructor Widget& operator=(const Widget& rhs…

拷贝构造函数(copy constructor)被用来以一个对象来初始化同类型的另一个对象,拷贝赋值运算符(copy assignment operator)被用来将一个对象中的值拷贝到同类型的另一个对象中: class Widget { public: Widget(); // default constructor Widget(const Widget& rhs); // copy constructor Widget& operator=(const Widget& rhs…

The answer is same as Copy Constructor. If a class doesn't contain pointers, then there is no need to write assignment operator and copy constructor. The compiler creates a default copy constructor and assignment operators for every class. The compil…

Difficulty Level: Rookie Consider the following C++ program. 1 #include<iostream> 2 #include<stdio.h> 3 4 using namespace std; 5 6 class Test 7 { 8 public: 9 Test() 10 { 11 } 12 Test(const Test &t) 13 { 14 cout<<"Copy constructo…

eg: num = 10 num += 1 # 等价于 num = num + 1 => 11 print(num) 特殊操作: 1.链式赋值 a = b = num print(a, b, num, id(a), id(b), id(num)) 2.交叉赋值 # 传统交换赋值x = 10 y = 20 temp = xx = yy = tempprint(x, y) Output:20 10 x, y = y, x print(x, y) 3.解压赋值 ls = [3, 1, 2] a, b,…

<Item 9> Never call virtual functions during construction or destruction 1.you shouldn't call virtual functions during construction or destruction, because the calls won't do what you think, and if they did, you'd still be unhappy. If you're a recov…

<Item 5> Know what functions C++ silently writes and calls 1.If you don't declare them yourself, compilers will declare their own versions of a copy constructor, a copy assignment operator, and a destructor. Furthermore, if you declare no constructo…