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# Include Using namespace STD;Class cdemo {Public:Cdemo (): STR (null ){}~ Cdemo () {If (STR) Delete [] STR ;}Char * STR;}; Int main (){Cdemo D1;D1.str = new char [32];Strcpy (d1.str, "Trend Micro "); Vector A1-> push_back (D1 ); Delete A1; Return 0;} AboveCodeAn error occurred while running.A1-> push_back (D1); inserts a cdemo Object D at the end of the vector indicated by a1. The value of D is equal to that of D1 (the default copy construc

Before we get to the formal topic, let's take a look at the next deep copy and the first copy concept: Shallow copy: Creates a new object that has an exact copy of the original object's attribute value, and if the attribute is a basic type, the copy is of the base type, an

Python Copy:In the Python language, there are two forms of shallow copy and deep copy, which is shadow copy in the Official document. When copying simple objects (object), there is no difference between the two, as shown in the following code:1 #shallow copy and deep copy co

ConceptThere are two ways to copy objects: Shallow copy and deep copy. As the name implies, shallow copy, not copy the object itself, just copy the pointer to the object; Deep copy copi

1. Basic concepts: First, we should know what deep copy and shallow copy are ). A. Shallow copy Shadow Clone: only copies the basic type of the object. The object type still belongs to the original reference.B. Deep copy (deep copy): Copies the basic class of the object, and

ConceptThere are two ways to copy objects: Shallow copy and deep copy. As the name implies, shallow copy, not copy the object itself, just copy the pointer to the object; Deep copy copi

Clone is copied as its name implies, and in the Java language, the Clone method is called by the object, so the object is copied. The so-called Replication object, the first to allocate a source object and the same size of space, in this space to create a new object. So in the Java language, there are several ways to create objects?1. Create an object using the new operator2. Copy an object using the Clone methodSo what are the similarities and differ

Today in the writing code encountered a wonderful problem, the problem is described as follows:The code declares a list, passes the list as a parameter into function1 (), and Del () in function1 () deletes an element.Function2 () also used the list as a parameter, after the call to Function1 () and then call function2 () there is a problem, the list value has been changed, there is a bug.Directly on the code:List = [0, 1, 2, 3, 4, 5]def function1 (list): del list[1] Print(list)def func

Title:python deep copy and shallow copyTags:python,copy,deepcopyGrammar_cjkruby:true---Python deep copy and shallow copy The assignment of a Python variable is a referenceAssign a variable to a variable, not copy the object, but

Deep copy and shallow copy requires compliance with Nscopying, nsmutablecopying 2 protocolsWhat is the literal meaning of copycopy is "copy", "Copy", is a copy of the process common replication is: File copy function: The use of a

First, what is it?Shallow copy : Copy the value of a member variable of a value type , copy only the reference to a member variable of the reference type, and do not copy the referenced object deep copy: a copy of a value for

One, Assignment (Assignment)>>> a = [1, 2, 3]>>> B = a>>> print (ID (a), id (b), sep= ' \ n ') 139701469405552139701469405552　　In Python, assigning a variable to another variable is actually adding a "label" to the object currently in memory.As in the example above, by using the built-in function ID (), you can see that a and B point to the same object in memory. a is bwill return True.Second, shallow copy (shallow

1. Deep copy and shallow copyA copy is usually referred to as copy or Clone (clone), and the copy of the object is a new object that duplicates an "exact" one from an existing object. Although they are all copied objects, different methods of replication, the new objects are not exactly the same, there are some differe

Like many languages, Python is divided into "copy" Ways of simple assignments, shallow copies, and deep copies. In the learning process, the initial understanding of the shallow copy is very vague. But after a series of experiments, I found a better understanding of the three concepts. One, assign the value Assignment is the most common of these three operations, and we analyze the assignment operation b

Recently read some books, deep copy and shallow copy of the words, always appear in front of the eyes, and then organized a bit, about the principle and implementation of the depth of Java.1. What is a deep/shallow copy?Shallow copy: Copy of the base data type value of the t