anonymous

问题 Why is the type of this function (a -> a) -> a? Prelude> let y f = f (y f) Prelude> :t y y :: (t -> t) -> t Shouldn't it be an infinite/recursive type? I was going to try and put into words what I think it's type should be, but I just can't do it for some reason. y :: (t -> t) -> ?WTFIsGoingOnOnTheRHS? I don't get how f (y f) resolves to a value. The following makes a little more sense to me: Prelude> let y f x = f (y f) x Prelude> :t y y :: ((a -> b) -> a -> b) -> a -> b But it's still

问题 Does the C++ standard say that std::initializer_list<T> is a reference to a local anonymous array? If it says, then we should never return such an object. Any section in the standard say so? Another question, are the underlying objects of a std::initializer_list<T> mutable? I tried to modify it: #include <initializer_list> int main() { auto a1={1,2,3}; auto a2=a1;//copy or reference? for(auto& e:a1) ++e;//error for(auto& e:a2) cout<<e; return 0; } But compiled with error : error: increment of

问题 I use multiple API coded in c# that works well. I want to use one receiving an anonymous object (I don't want to create a Class). I have a problem when I try to deserialize the object. I have an API following this scheme, it works well when it's called from python using the json_dumps function. But when I try with JSON.stringify (from an a or even POSTMAN, I have a 400 bad request. Here is my code, I have tried a lot of things : [WebInvoke(Method = "POST", UriTemplate = "myUrl")]

问题 For my homework assignment in ML I have to use the fold function and an anonymous function to turn a list of integers into the alternating sum. If the list is empty, the result is 0. This is what I have so far. I think what I have is correct, but my biggest problem is I cannot figure out how to write what I have as an anonymous function. Any help would be greatly appreciated. fun foldl f y nil = y | foldl f y (x::xr) = foldl f(f(x,y))xr; val sum = foldl (op -) ~6[1,2,3,4,5,6]; val sum = foldl

问题 Is there any way that Vala supports Self Invoking? Either with a class, or with a method? Javascript supports self invoking like below. Which is what im looking for. (function(){ // some code… })(); I'm attempting to load a class into a hashmap for dynamically loading. 回答1: using Gee; [CCode (has_target = false)] delegate void MyDelegate(); int main() { var map = new HashMap<string, MyDelegate>(); map["one"] = () => { stdout.printf("1\n"); }; map["two"] = () => { stdout.printf("2\n"); };

问题 I need to implement a user authentication system that supports anonymous users, like how this site works. Can it be done with the default asp.net membership provider? if not, what are some of the things I need to do? 回答1: Yes, it can be done. There's even a special event to migrate anonymous user details once the user logs in: http://msdn.microsoft.com/en-us/library/system.web.profile.profilemodule.migrateanonymous.aspx 来源： https://stackoverflow.com/questions/647038/how-can-i-support

问题 I'm aware of 3 different ways to do callback type functionality in Java, but I don't fully understand the pros/cons of each. Java APIs are rich with methods similar in nature to this: Button b = new Button(); b.setClickListener(<implements ClickListener>); I'm using "button" as a generic example, not to refer to any specific API. 1.) One way to use it is to have your class implement the interface and pass it as the argument. To handle multiple "buttons" you'd have to use whatever information

问题 Just notice Google Place API has this update, the problem is all of the names are changed to A Google user and it looks like including people is not posted by anonymous: author_name the name of the user who submitted the review. Anonymous reviews are attributed to "A Google user". https://developers.google.com/places/web-service/details#PlaceDetailsResults I am using a simple JS plugin to display reviews on a website, right now all of the Review author names are changed to A Google user :

问题 Is there any way to create dynamically an extended anonymous instance given another one? Would be something like this, and I think it would be great. File myFile = new File("notes.txt"); new FileWrapper extends myFile(){ //instance!!! @Override public boolean equals(File in){ return false;} }; This is like copying the object instance and rewritting the logic inside a particular method If not whats the best way of achieving it? Note: I know that the example is valid if myFile is a class´s name

问题 Visual Studio 2008 | Silverlight 3 | SQL Server 2005 | Domain Services Class | Entity Data Model I have a database table "Students" with columns FirstName, LastName, Semester, ProgramOfStudy, Column etc....... The goal is to return a Total (number of students grouped by first letter of lastname), based on the first letter of the lastname of all students in a given Semester and Programofstudy . Here is the SQL which works: SELECT DISTINCT TOP (100) PERCENT LEFT(lastName, 1) AS