set

问题 I am trying to create a dictionary that has values as a Set object. I would like a collection of unique names associated with a unique reference). My aim is to try and create something like: AIM: Dictionary[key_1] = set('name') Dictionary[key_2] = set('name_2', 'name_3') Adding to SET: Dictionary[key_2].add('name_3') However, using the set object breaks the name string into characters which is expected as shown here. I have tried to make the string a tuple i.e. set(('name')) and Dictionary

问题 I am trying to insert a object Point2D into a Point2D set but i am not able to do it, it seems the set works for int and char but not for objects. I need help to know how to insert objects into the set ??? Assuming i want to sort them by ascending order of x value class Point2D { public: Point2D(int,int); int getX(); int getY(); void setX(int); void setY(int); double getScalarValue(); protected: int x; int y; double distFrOrigin; void setDistFrOrigin(); }; int main() { Point2D abc(2,3); set

问题 This may not be the real world scenario but just curious to know what happens, below is the code. I am creating a set of object of class UsingSet . According to hashing concept in Java, when I first add object which contains "a", it will create a bucket with hashcode 97 and put the object inside it. Again when it encounters an object with "a", it will call the overridden hashcode method in the class UsingSet and it will get hashcode 97 so what is next? As I have not overridden equals method,

问题 ListSet (collection.immutable.ListSet) is a inverse ordered set. I need ordered set. This is a example of original ListSet: var a = ListSet(1,2,3) var ite = a.iterator ite.next // returns 3 ite.next // returns 2 ite.next // returns 1 And this is a example of I need: var a = ListSet(1,2,3) var ite = a.iterator ite.next // returns 1 ite.next // returns 2 ite.next // returns 3 UPDATE: "Ordered" is a "Insertion Ordered" for me. I need this: var a = ListSet(1,2,3) a += 5 a += 4 var ite = a

问题 I am porting some C++ code to Python and one of the data structures is a multiset, but I am not sure how to model this in Python. Let ms be the C++ multiset<int> How ms is used (posting some examples) multiset<int>::iterator it = ms.find(x) ms.erase(it) ms.insert(x) ms.end() ms.lower_bound(x) ms.clear() 回答1: There isn't. See Python's standard library - is there a module for balanced binary tree? for a general discussion of the equivalents of C++ tree containers ( map , set , multimap ,

问题 At the moment, TypeScript does not allow use get/set methods(accessors) in interfaces. For example: interface I { get name():string; } class C implements I { get name():string { return null; } } furthermore, TypeScript does not allow use Array Function Expression in class methods: for ex.: class C { private _name:string; get name():string => this._name; } Is there any other way I can use a getter and setter on an interface definition? 回答1: You can specify the property on the interface, but

问题 Can anyone please provide me some idea/guidance on how to save an image from a webserver and set it as wallpaper? i am developing an android application which needs to do that and i am new in android. Thanks a lot. I had tried writing my own code but it doesn't work as i can't find my images after download but the wallpaper has change to the downloaded picture. here is my existing code. Bitmap bmImg; void downloadFile(String fileUrl) { URL myFileUrl = null; try { myFileUrl = new URL(fileUrl);

问题 I have a question. I am a newbie with Run Time Type Information from Delphi 2010. I need to set length to a dynamic array into a TValue. You can see the code. Type TMyArray = array of integer; TMyClass = class publihed function Do:TMyArray; end; function TMyClass.Do:TMyArray; begin SetLength(Result,5); for i:=0 to 4 Result[i]=3; end; ....... ....... ...... y:TValue; Param:array of TValue; ......... y=Methods[i].Invoke(Obj,Param);//delphi give me a DynArray type kind, is working, Param works

问题 The official Python 2.7 docs for these methods sounds nearly identical, with the sole difference seeming to be that remove() raises a KeyError while discard does not. I'm wondering if there is a difference in execution speed between these two methods. Failing that, is there any meaningful difference (barring KeyError) between them? 回答1: Raising an exception in one case is a pretty meaningful difference . If trying to remove an element from a set that is not there would be an error, you better

问题 The official Python 2.7 docs for these methods sounds nearly identical, with the sole difference seeming to be that remove() raises a KeyError while discard does not. I'm wondering if there is a difference in execution speed between these two methods. Failing that, is there any meaningful difference (barring KeyError) between them? 回答1: Raising an exception in one case is a pretty meaningful difference . If trying to remove an element from a set that is not there would be an error, you better