Examples of using Copy constructor in English and their translations into Russian
{-}
-
Official
-
Colloquial
When is it useful to use the copy constructor?
The copy constructor is also called a copy initializer.
The point is that the class lacks a copy constructor.
In the class, the copy constructor must be declared in cases, if necessary.
To fix the class,we need to implement a copy constructor.
That is, using the copy constructor, you can get a copy of an existing object.
Example of returning a class from a function by value using the copy constructor.
As the comment suggests, the copy constructor is needed for synch.
The class declares several constructors, including the copy constructor.
Demonstration of the use of the copy constructor in some program code method.
It is pretty long, but the only thing we are concerned with now is that the class has the assignment operator but lacks a copy constructor.
During the call of this function we will have a call of a copy constructor for the UStringVector class.
It means that a copy constructor will be used to create a new object,'e', of type Exception_Base.
Copying of objects is achieved by the use of a copy constructor and an assignment operator.
A copy constructor has as its first parameter a(possibly const or volatile) reference to its own class type.
A similar trouble will occur when a copy constructor is present but the assignment operator is absent.
A private variable must not have a reference type 2 if the variable is an instance of a class,the class should have a copy constructor defined.
In this topic, the work of the copy constructor is considered using the example of unmanaged( native) classes.
The analyzer has detected a possible error that has to do with a call of an automatically generated copy constructor or assignment operator.
To copy the data, you can use the copy constructor generated by the compiler or write one of your own.
The referenced data should be either copied explicitly, or,(when you're dealing with objects)entrusted to the compiler which uses the copy constructor.
Analyzer could look into the copy constructor and try to figure it all out, of course, but it is generally hopeless.
The analyzer generated 206 V690 warnings about a class containing a copy constructor but missing an assignment operator.
It means that using the copy constructor, a new object will be constructed and part of the exception information will be lost.
Such objects should never be copied using such functions as memcpy orautomatically generated functions copy constructor, assignment operator.
By using a user-defined copy constructor the programmer can define the behavior to be performed when an object is copied. .
The rule of three(also known as the Law of The Big Three or The Big Three) is a rule of thumb in C++(prior to C++11) that claims that if a class defines one(or more)of the following it should probably explicitly define all three: destructor copy constructor copy assignment operator These three functions are special member functions.
The implicit copy constructor of a class calls base copy constructors and copies its members by means appropriate to their type.
However, the object can still be copied using the copy constructor, which the compiler creates by default.
A user-defined copy constructor is generally needed when an object owns pointers or non-shareable references, such as to a file, in which case a destructor and an assignment operator should also be written see Rule of three.