c assignment operator

To solve the problem above, we should write a special value assignment operator function to deal with such problems. When you need to assign values to two objects in the same class, you can overload the operator function. This method can solve the problem of class assignment and pointer release. In the following progra

none;text-autospace:none">Bjarne stroustrup, a C ++ designer, has made great efforts to make user-defined types work in the same way as fixed types. This is why you can overload operators, write type conversion function, control value assignment and copy constructor. none;text-autospace:none">When you overload the value assignment operator for the class type, pay

Example: Class mystring { Public: Mystring (const char * value) { If (value! = NULL) { Data = new char [strlen (value) + 1]; Strcpy (data, value ); } Else { Data = new char [1]; * Data = '\ 0 '; } } ~ String () { Delete [] data; } PRIVATE: Char * data; }; In this case, the value assignment operator and copy constructor are not declared in the mystring class, wh

6.5.16 assignment operatorGrammar1,assignment-expression:conditional-expressionunary-expression assignment-operator assignment-expressionAssignment-operator: one of the following= *=/=%= + = = Constraints2, an

In the course of reading Objective C ++, I have been sighing for countless times. This is a good fucking write. Therefore, I decided to write the content of this book into five blogs based on my own understanding. I think whether or not you understand these terms is worth writing down. The following indexes correspond to the chapters in the book.11: if the class is dynamically configured with memory, declare a copy constructor and an assignment

One, bitwise operatorsIn general applications, we basically use an operator that is not in place. Although, it is based on the underlying, performance and speed will be very good, and that is because the lower level, the use of the difficulty is also very large, the underlying operation is converted to binary operation.There are seven bitwise operators, namely, bit non-not (~), Bit and and (), bit or OR (|), bitwise XOR (^), left Shift (var // -26 var

Once a C + + expert said: see a C + + programmer is hard enough, let him write an assignment overload function can be seen! In my opinion, this is not an exaggeration. Because it really needs a solid foundation to write the operator= function well, there are a lot of pitfalls. Trap one: Don't know how to avoid self-copying Look at the code firststring string::

The basic assignment operator is "". At first, we may think it is "equal", but it is not. It actually means assigning the value of the right expression to the number of operations on the left. The value of the value assignment expression is the value assigned. That is to say, the value of "$ a3" is 3. In this way, you can do some tips: the basic

First, the C + + assignment operator is intended as "reference to return the left value" (left value: The variable to the left of the assignment number, not its value) Cases: int A, b = 3, c = 2;(A = b) = C;cout For a = B (when A,b is an object), a temporary object is generated if the reference to the left value is not returned, and the value of the last objec

1. Potential self-assignment A[i] = A[j]; *PX = *py; When two objects come from the same inheritance system, they may not even need to be declared as the same type to create aliases. The question now is: If you point to the same object, when one of the objects is deleted and the other is deleted, this can result in unwanted results. What should I do? Like what: widget Widget:: operator+ (const widget RHS) {

Item 11-handling "self-assignment" (Handle assignment to the operator =) in operator ="Self-assignment" occurs when an object is assigned to itself:EX1:Class widget{...}; Widget w;...w=w; Assign to yourselfEx2: Create a class to hold a pointer to a dynamically allocated b

This document is the official manual of Mariadb: The translation of the assignment operator (: =).Original:https://mariadb.com/kb/en/assignment-operator/I submit it to MARIADB official manual:https://mariadb.com/kb/zh-cn/assignment-opera