reference

问题 I'd implementing a simple linked list. This is the (working) code I had so far: pub struct LinkedList<T> { start: Option<Box<Link<T>>>, } impl<T> LinkedList<T> { pub fn new() -> LinkedList<T> { return LinkedList { start: None }; } } struct Link<T> { value: Box<T>, next: Option<Box<Link<T>>>, } impl<T> Link<T> { fn new_end(value: T) -> Link<T> { return Link::new(value, None); } fn new(value: T, next: Option<Box<Link<T>>>) -> Link<T> { return Link { value: Box::new(value), next, }; } } Next on

问题 As you can see I am using soft/logical deletion on my system: My entities: @Where(clause = "deleted='false'") public class Person { //... } My services: @Override public ServiceResponse DeletePerson (Person entity) { ServiceResponse sr = new ServiceResponse<>(); try { sr = ValidateDeletePerson(entity); //Business logic treatment if (sr.hasError()) return sr; Person dbEntity = GetPerson(entity.getPersonID()); dbEntity.setDeleted(true); _repository.save(dbEntity); } catch (Exception ex) { sr

问题 As you can see I am using soft/logical deletion on my system: My entities: @Where(clause = "deleted='false'") public class Person { //... } My services: @Override public ServiceResponse DeletePerson (Person entity) { ServiceResponse sr = new ServiceResponse<>(); try { sr = ValidateDeletePerson(entity); //Business logic treatment if (sr.hasError()) return sr; Person dbEntity = GetPerson(entity.getPersonID()); dbEntity.setDeleted(true); _repository.save(dbEntity); } catch (Exception ex) { sr

问题 In SSRS, is it possible to reference a report variable from a report function? Below is my report function. Instead of declaring and setting the MaxRFWIDRange in the function, I'd rather reference a report variable with the same name. Function ValidateRFWIDRange(FromRFW As Integer, ToRFW As Integer) As Boolean Dim DiffRFW As Integer Dim MaxRFWIDRange As Integer MaxRFWIDRange = 10000 DiffRFW = ToRFW - FromRFW If DiffRFW > MaxRFWIDRange Then Return False Else Return True End if End Function 回答1

问题 I'm writing a simple container class in C++ similar to a map that stores objects indexed by a key. I'd like to provide an accessor function such as: V& getValue(const K &key); where I return a reference to the value. But I also wanted to handle the case where the key/value is not present and be able to return some status to the user (there could be some reasons why it is not there that I want to communicate back to the caller via some Status type). I suppose I could do the following but

问题 I am confused with the two. I am aware of the C++ references which are inherently constant and once set they cannot be changed to refer to something else. 回答1: const int& means reference to const int . (Similarly, int& means reference to non-const int .) int& const literally means const reference (to non-const int ), which is invalid in C++, because reference itself can't be const-qualified. $8.3.2/1 References [dcl.ref] Cv-qualified references are ill-formed except when the cv-qualifiers are

问题 I am confused with the two. I am aware of the C++ references which are inherently constant and once set they cannot be changed to refer to something else. 回答1: const int& means reference to const int . (Similarly, int& means reference to non-const int .) int& const literally means const reference (to non-const int ), which is invalid in C++, because reference itself can't be const-qualified. $8.3.2/1 References [dcl.ref] Cv-qualified references are ill-formed except when the cv-qualifiers are

问题 When overloading assignment operator of a class in C++, must its parameter be reference? For example, class MyClass { public: ... MyClass & operator=(const MyClass &rhs); ... } Can it be class MyClass { public: ... MyClass & operator=(const MyClass rhs); ... } ? Thanks! 回答1: The parameter of an overloaded assignment operator can be any type and it can be passed by reference or by value (well, if the type is not copy constructible, then it can't be passed by value, obviously). So, for example,

问题 I have a dll which is based on .net 3.5 -- it uses internally for example Linq, but the exposed API is straightforward, no fancy stuff. Since C# generics are resolved at compile time I assume that for calling party all it counts is API (all public parts). However when I try to use this dll from net2.0 project I get info, that the dll cannot be referenced because the dll or one of its dependencies requires a later version of .net framework. I can install any .net version I want on target

问题 I have a dll which is based on .net 3.5 -- it uses internally for example Linq, but the exposed API is straightforward, no fancy stuff. Since C# generics are resolved at compile time I assume that for calling party all it counts is API (all public parts). However when I try to use this dll from net2.0 project I get info, that the dll cannot be referenced because the dll or one of its dependencies requires a later version of .net framework. I can install any .net version I want on target