PythonStudy——赋值运算符 Assignment operator

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PythonStudy——赋值运算符 Assignment operator

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,…

Lintcode208 Assignment Operator Overloading (C++ Only) solution 题解

[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…

Effective C++ 第0章 copy constructor和copy assignment operator

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…

copy constructor和copy assignment operator的区别

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…

Java基础-赋值运算符Assignment Operators与条件运算符Condition Operators

Java基础-赋值运算符Assignment Operators与条件运算符Condition Operators 作者:尹正杰版权声明:原创作品,谢绝转载!否则将追究法律责任. 一.赋值运算符表达式的数据类型要与左边变量的类型兼容 1>.常规赋值 /* @author :yinzhengjie Blog:http://www.cnblogs.com/yinzhengjie/tag/Java%E5%9F%BA%E7%A1%80/ EMAIL:y1053419035@qq.com */ pub…

Default Assignment Operator and References

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…

When should we write our own assignment operator in C++?

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…