identifier

问题 Earlier today someone generously answered my question regarding the retrieval of a unique identifier associated with files on the computer. Unique File Identifier The solution worked great, however, it does not address unique identifiers for folders. How can I retrieve a UID for specified directories, UID's that will stay with the directory through renames and moves. Update: FSCTL_GET_OBJECT_ID seems like it is the function I am after, but would someone be able to provide brief context on the

问题 Browsing the v8 tree, under the src directory, some js files were there, providing some basic JS objects like Math, Array etc. Browsing those files, I saw identifiers including a percent sign (%) in their names, i.e. %Foo . I first naively thought it was some other allowed character in JS's identifiers, but when I tried it in shell, it yelled at me, saying that I'm violating syntax rules. But if it is a syntax error, how come d8 works? Here are an example from the actual source code: src

问题 I'm working on a pre-written module for a site, and I need to target an element with the id test:two . Now, this element has a colon in it, so jQuery is presumably and understandably seeing the 'two' as a pseudo class. Is there any way of targeting this element with jQuery? Also, changing the ID is not possible. Believe me, if I could I would. I've put together an example: $('#test').css('background','red'); $(document.getElementById('test:two')).css('background','blue'); $('#test:two').css(

问题 I am reading for SCJP and I have a question regarding this line: Identifiers must start with a letter, a currency character ($), or a connecting character such as the underscore ( _ ). Identifiers cannot start with a number! It states that a valid identifier name can start with a connecting character such as underscore. I thought underscores were the only valid option? What other connecting characters are there? 回答1: Here is a list of connecting characters. These are characters used to

问题 This question already has answers here : In Java compiler，which type can be defined as identifier ( ID ) or Keyword (reserved word)? (2 answers) Closed 4 years ago . I have studied about java which have listed 50 Java keywords. There is a homework of Lex, the goal is to recognize the word is keywords, IDs, symbols, operators. But there is one more little problem is the code below, is print in System.out.print() an ID or keyword? public class HelloWorld { public static int add(int a, int b) {

问题 I have a class at the moment with these lines of code. What I am struggling with is the function write in that my IDE says "Use of undeclared identifier for root" Why is this? template<typename T> class X { public: const void write(std::ostream & output); private: std::unique_ptr< TreeNode<Ty> > root; }; const void write(std::ostream & output) { root->write(output); } Edit to show more full extent of the code with the Template. 回答1: Try using the scope resolution operator to tell the compiler

问题 I have got this error on the line where the void is it says undeclared identifier for sliderDidChange can some one please help me with this i can;t find any answers. h. file // // LightViewController.h // Flash Light // // Created by John Whitney on 12-07-27. // Copyright (c) 2012 Perfect Programs. All rights reserved. // #import <UIKit/UIKit.h> #import <AVFoundation/AVFoundation.h> @interface LightViewController : UIViewController { IBOutlet UISlider *slider; IBOutlet UISlider *theslider;

问题 Consider this project structure: MyComponent.qml: Item { id: innerId } Usage.qml: MyComponent { id: outerId } At first glance it seems like this creates a single object that has 2 different id's simultaneously. But that's impossible, if id is to be considered a property. To me it seems that an id is not so much a property of an object as it is a property of an object declaration . Is that true? It would explain how I can refer to the object as innerId in MyComponent.qml and as outerId in

问题 I'm trying to create a fairly simple trigger that would add one to a column that keeps track of the number of rentals from a movie distribution company similar to Netflix. The columns I am focused on are: Movies ( movie_id, movie_title, release_year, num_rentals ) Customer_rentals ( item_rental_id, movie_id, rental_date_out, rental_date_returned ) My current trigger looks like this: CREATE TRIGGER tr_num_rented_insert ON customer_rentals FOR INSERT AS BEGIN UPDATE movies SET num_rentals=num

问题 I'm looking for how can I write identifiers name with characters like [ ' " or #. Everytime that I try to do that, I give the error: error: macro names must be identifiers But learning about gcc, I found this option: -fextended-identifiers But it seems not working like I wanted, please, somebody know how to accomplish that? 回答1: Identifiers can't include such characters. It is defined that way in the language syntax, identifiers are letters, digits or underline (and mustn't begin with a digit