reference

问题 From what I understand by now, I can say that a reference in C# is a kind of pointer to an object which has reference count and knows about the type compatibility. My question is not about how a value type is different than a reference type, but more about how a reference is implemented. I have read this post about what differences are between references and pointers, but that does not cover that much about what a reference is but it it's describing more it's properties compared with a

问题 From what I understand by now, I can say that a reference in C# is a kind of pointer to an object which has reference count and knows about the type compatibility. My question is not about how a value type is different than a reference type, but more about how a reference is implemented. I have read this post about what differences are between references and pointers, but that does not cover that much about what a reference is but it it's describing more it's properties compared with a

问题 From what I understand by now, I can say that a reference in C# is a kind of pointer to an object which has reference count and knows about the type compatibility. My question is not about how a value type is different than a reference type, but more about how a reference is implemented. I have read this post about what differences are between references and pointers, but that does not cover that much about what a reference is but it it's describing more it's properties compared with a

问题 This is not a duplicated question. I've already searched on SO but I need a different thing. Is today a way to access an internal class from Razor View, I know that the assembly must be visible and is it yet. No properties nor methods declared in an "internal" class are accessible from Views by default. I need a way to override this. Thanks. 回答1: In most cases you can change the class from internal to public. You can use the InternalsVisibleTo when that isn't desirable. In the case of

问题 It occurred to me that in C++ it is possible to use the type std::optional<std::reference_wrapper<T>> . An object of this type is essentially a reference to an object of type T or a null value, i.e., pretty much a pointer. My questions: Is there any conceptual difference between std::optional<std::reference_wrapper<T>> and T* ? Is there any practical difference? Are there situations where it might be advisable to choose std::optional<std::reference_wrapper<T>> over T* ? 回答1: Is there any

问题 It occurred to me that in C++ it is possible to use the type std::optional<std::reference_wrapper<T>> . An object of this type is essentially a reference to an object of type T or a null value, i.e., pretty much a pointer. My questions: Is there any conceptual difference between std::optional<std::reference_wrapper<T>> and T* ? Is there any practical difference? Are there situations where it might be advisable to choose std::optional<std::reference_wrapper<T>> over T* ? 回答1: Is there any

问题 I am faced with a problem that gives me this error: A circular reference has been detected when serializing the object of class "App\Entity\User" (configured limit: 1) I have an Enterprise entity that has mission orders, vehicles, and users. An orders entity that has a relationship with a User, Company, and Vehicle. And a User entity that has a relationship with orders and company. So I have this: Entreprise.php class Entreprise { /** * @ORM\Id() * @ORM\GeneratedValue() * @ORM\Column(type=

问题 This question already has answers here : What is the difference between a variable, object, and reference? [duplicate] (5 answers) Closed 5 years ago . What happens if I do: Object obj = new Object(); obj = null; Does it remove the object from memory, or clear just the reference? More formally, consider the code: Object obj = new Object(); Object temp = obj; obj = null; Why is temp still not null ? Shouldn't it have been removed from memory? 回答1: In your first example: obj -------> |OBJECT|

问题 This question already has answers here : What is the difference between a variable, object, and reference? [duplicate] (5 answers) Closed 5 years ago . What happens if I do: Object obj = new Object(); obj = null; Does it remove the object from memory, or clear just the reference? More formally, consider the code: Object obj = new Object(); Object temp = obj; obj = null; Why is temp still not null ? Shouldn't it have been removed from memory? 回答1: In your first example: obj -------> |OBJECT|

问题 This question already has answers here : What is the difference between a variable, object, and reference? [duplicate] (5 answers) Closed 5 years ago . What happens if I do: Object obj = new Object(); obj = null; Does it remove the object from memory, or clear just the reference? More formally, consider the code: Object obj = new Object(); Object temp = obj; obj = null; Why is temp still not null ? Shouldn't it have been removed from memory? 回答1: In your first example: obj -------> |OBJECT|