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In this guide, we will identify several possible causes that can lead to errors. The part number c2530 needs to be initialized and then I’ll show you various ways you can try to fix this.
It is mandatory to initialize the link when it is requested if it has not already been declared:
With a specific external keyword.
As a member of a class, structure, or union (and the following is initialized in the constructor).
as a parameter in a function declaration or as a definition.
Corresponding function as return type.
// C2530.cppint main () integer i = 0; int? // C2530 integer & k means i; // OK
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First of all,
A :: s_ is an absolute reference to
std :: string ; it means that it indicates something that must definitely exist somewhere.
Due to its reference format and the fact that reviews and recommendations must be initialized at build time, you must initialize
A :: s_ by typing ALL
A – Constructors (as pointed out by other users):
Class AGeneral: A (string & s)! ! ! SS) cout << "A :: ctor" << endl; A (const A & rhs) :: s_ (rhs.s_) // <- here too !! cout << "A :: copy" << endl; ~ One () cout << "A :: dtor" << endl; Operator A & = (const A & rhs) cout << "A :: copyassign" << endl;Private: The string & s_;;
Now let's get back to the first the error I mentioned;
A :: s_ should refer to something that exists, so there are a few things you should know, take a look at the following code:
int main () // New instance of A: A a ("Hello everyone"); Return 0;
When creating this instance of
A we add the value
const char  , with this key fact value the temporary value
std :: string specially is created and passed to each
A :: A (string & s) constructor. Where can I refer to
A :: s_ after the constructor completes? What's going on with the temporarily generated
std :: string ? Will its lifespan increase or will it die as if the
A constructor had ended? Are you sure the link is what you want?
std :: string s ("Hello everyone");int main () // New instance of A: A a (s); Returns 0;
In the main code above, the new
A event calls the constructor
A :: A (string & s) unchanged, but with the string presumably contained in the global array so that it is not destroyed, and furthermore,
A :: s_ circumstances
a will refer to a string, de Valid for most of its lifespan, but a real possibility in the copy constructor:
std :: string s ("Hello everyone");int main () A a (s); // a.s_ resources of the global s. A b (a); // b.s_ refers to a.s_, which refers to the global s. Returns 0;
The cost of copied objects refers to the
std :: string of these given objects! Is this what buyers want?
The trick in C ++ is an alias for a data instance. Whether something is distant and close to a reference is usually a constant pointer. However, there are significant quantitative differences between the evidence and the evidence that it would be a mistake to view the other direction as a constant tip. However, desert as a reference is a constant type that must refer to a data instance before it can be used.
int x means 10;int? refx = x;
int y1 means 10;integer y2 = 11;int & refy = y1> y2! ! ! y1: y2;
structure only one A (int & x): mbRef (x) // there should be an initialization list here int? // must be initial ized in the constructor;
Finally, to learn more about link initiation, please tell the country which of the following statements is completely incorrect:
How to assign an object to an uninitialized reference?
You can do this by placing it above the initialization list: the error is definitely trying to assign via your uninitialized reference: the C ++ reference cannot be assigned - it will be assigned the object it references again - and so if it is part it should be initialized in the initialization list (as the compiler says).
Error C2530 Las Referencias Deben Inicializarse
Ошибка C2530 Ссылки должны быть инициализированы
I Riferimenti Di Errore C2530 Devono Essere Inizializzati
Fehler C2530 Referenzen Müssen Initialisiert Werden
Erro C2530 Referências Devem Ser Inicializadas
Erreur C2530 Les Références Doivent être Initialisées
Fel C2530-referenser Måste Initieras
Fout C2530 Referenties Moeten Worden Geïnitialiseerd
오류 C2530 참조를 초기화해야 합니다.
Błąd C2530 Referencje Muszą Zostać Zainicjowane