generics

问题 I'm trying to make a generic struct that can be initialized to something of type T . It looks like this: pub struct MyStruct<T> { test_field: Option<T>, name: String, age: i32, } impl MyStruct<T> { fn new(new_age: i32, new_name: String) -> MyStruct<T> { MyStruct<T> { test_field: None, age: new_age, name: new_name, } } } This doesn't seem to work. Among other errors, I get: error: chained comparison operators require parentheses --> src/lib.rs:9:17 | 9 | MyStruct<T> { | ^^^^^ | 回答1: I highly

问题 I want to be able to construct an object from inside a generic function. I tried the following: abstract class Interface { Interface.func(int x); } class Test implements Interface { Test.func(int x){} } T make<T extends Interface>(int x) { // the next line doesn't work return T.func(x); } However, this doesn't work. And I get the following error message: The method 'func' isn't defined for the class 'Type' . Note : I cannot use mirrors because I'm using dart with flutter. 回答1: Dart does not

问题 I'm a newbie to Java. I have provided a short snippet from my code for BFS. public int bfs(Person p, Person q) { private HashMap<Person, boolean> marked; private int count; marked = new marked<Person, boolean>(); count = new int; } According to Eclipse, I have an error on each of the last 4 lines. Syntax Error: insert "Dimensions" to complete expression/referencetype. I would appreciate any input/advice! 回答1: Cause of this error -You are trying to pass a primitive object into a generic type

问题 I'm a newbie to Java. I have provided a short snippet from my code for BFS. public int bfs(Person p, Person q) { private HashMap<Person, boolean> marked; private int count; marked = new marked<Person, boolean>(); count = new int; } According to Eclipse, I have an error on each of the last 4 lines. Syntax Error: insert "Dimensions" to complete expression/referencetype. I would appreciate any input/advice! 回答1: Cause of this error -You are trying to pass a primitive object into a generic type

来源： https://stackoverflow.com/questions/64500298/call-method-by-name-inside-generic-function

来源： https://stackoverflow.com/questions/64500298/call-method-by-name-inside-generic-function

来源： https://stackoverflow.com/questions/64500298/call-method-by-name-inside-generic-function

来源： https://stackoverflow.com/questions/64500298/call-method-by-name-inside-generic-function

来源： https://stackoverflow.com/questions/64500298/call-method-by-name-inside-generic-function

来源： https://stackoverflow.com/questions/64627827/change-value-of-generic-property-after-initialization