reserved-words

What is the difference between “keyword” and “reserved word”?

由 a 夏天 提交于 2019-12-03 17:55:30
问题 What's the difference between a keyword and a reserved word ? For example, in the proposal for concepts in C++ one can read the following statement: This proposal introduces five new keywords: concept, concept map, where, axiom, and late check. All of these keywords will also be reserved words. 回答1: Keywords have a special meaning in a language, and are part of the syntax. Reserved words are words that cannot be used as identifiers (variables, functions, etc.), because they are reserved by

Restart a foreach loop in C#?

由 帅比萌擦擦* 提交于 2019-12-03 15:23:42
问题 How can I restart a foreach loop in C#?? For example: Action a; foreach(Constrain c in Constrains) { if(!c.Allows(a)) { a.Change(); restart; } } restart here is like continue or break but it restarts the foreach from the begining It is like setting the counter of a for loop to 0 again.. Is that possible in C#? Edit:I want to thank both Mehrdad Afshari and Mahesh Velaga for letting me discover a bug (index=0) in my current implementation, that would not have been discovered otherwise.. 回答1:

Restart a foreach loop in C#?

由 妖精的绣舞 提交于 2019-12-03 05:52:23
How can I restart a foreach loop in C#?? For example: Action a; foreach(Constrain c in Constrains) { if(!c.Allows(a)) { a.Change(); restart; } } restart here is like continue or break but it restarts the foreach from the begining It is like setting the counter of a for loop to 0 again.. Is that possible in C#? Edit:I want to thank both Mehrdad Afshari and Mahesh Velaga for letting me discover a bug (index=0) in my current implementation, that would not have been discovered otherwise.. Use the good old goto : restart: foreach(Constrain c in Constrains) { if(!c.Allows(a)) { a.Change(); goto

What are the reserved words BEGIN or END used for in Ruby?

由 五迷三道 提交于 2019-12-03 05:45:47
问题 This is a very hard to find word because in most cases they are not sensitive during a search. The best I could find outside of documentation is a test in IRB. BEGIN{puts x = 10} 10 回答1: As all keywords BEGIN and END are documented as public instance methods of Object (even though you won't see them returned from Object.public_instance_methods ) BEGIN Designates, via code block, code to be executed unconditionally before sequential execution of the program begins. Sometimes used to simulate

List of reserved words in rails *3*

由 孤街浪徒 提交于 2019-12-02 23:09:05
Is there a good, authoritative list of reserved words for RAILS-3? Candidates: http://oldwiki.rubyonrails.org/rails/pages/ReservedWords , but it seems a bit out of date and rails2. http://cheat.errtheblog.com/s/rails_reserved_words (but there seems no authority to this - it could just grow and grow...) http://latheesh.com/2010/02/02/rails-reserved-words/ Background: I'm maintaining a long-serving rails app and it has plenty of usages of reserved words (judging that http://oldwiki.rubyonrails.org/rails/pages/ReservedWords seems to apply to rails2). However, none of these are actually

Is x a reserved keyword in Javascript FF/Safari not in IE?

由 五迷三道 提交于 2019-12-02 10:06:55
问题 A web page of a web application was showing a strange error. I regressively removed all the HTML/CSS/JS code and arrived to the basic and simple code below. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html><head> <title>test</title> <script type="text/javascript"> var TestObj = { foo: function() {} } alert(x); //ok displays "undefined" var x = TestObj.foo; var z = TestObj.foo; </script> </head><body> <p onclick='alert(x);'>Click

How to use sql defined functions as fields?

由 非 Y 不嫁゛ 提交于 2019-12-02 04:05:25
I am creating tables in Sql Management Studio 2012 using SQL. How do I make fields or columns with names that are already defined in Sql Server e.g User_ID, User_Name. I want to use them as fields in my tables. Table definition from Duplicate Post : create table Ticket( Ticket_Id varchar(10) not null, TicketType_Id varchar(3) not null, Ticket_PurchaseDate DateTime null, LottoDraw_Id int null, User_Id int null, Ticket_IsWinner bit null Primary Key(Ticket_Id,TicketType_Id) ) Warp the column name like in brackets [ ] ... such as create table Ticket( Ticket_Id varchar(10) not null, TicketType_Id

Reserved function names in JavaScript

由 落花浮王杯 提交于 2019-12-02 01:23:52
After renaming my function the code stopped working. That new name scrollIntoView seems to be clashing with the element.scrollIntoView() method. <div onmousedown="scrollIntoView('id001')"/> function scrollIntoView(id) { alert(id); } I've created a simple test case https://jsfiddle.net/mgtn215y/ which has shown my function is simply ignored in favor of element.scrollIntoView() even it is not called on element attributes do not match The solution is obvious - to use a different function name. As this behavior is consistent across major browsers, I expect this is specified somewhere. However, I

How do I use quoted identifier for user + table name combination in Oracle?

由 丶灬走出姿态 提交于 2019-12-01 23:26:27
问题 In my Oracle DB setup all the tables are created under dedicated user account SYS0MYUSER . When executing following query on my system I got SQL Error: ORA-00903: invalid table name SELECT COUNT(*) FROM SYS0MYUSER.USER; I tried to escape the reserved keyword like this: SELECT COUNT(*) FROM "SYS0MYUSER.USER"; But then I got another error SQL Error: ORA-00942: table or view does not exist What is the correct way to escape user name + reserved keyword combination ? UPDATE: What's about table

How do I use quoted identifier for user + table name combination in Oracle?

由 一曲冷凌霜 提交于 2019-12-01 20:48:55
In my Oracle DB setup all the tables are created under dedicated user account SYS0MYUSER . When executing following query on my system I got SQL Error: ORA-00903: invalid table name SELECT COUNT(*) FROM SYS0MYUSER.USER; I tried to escape the reserved keyword like this: SELECT COUNT(*) FROM "SYS0MYUSER.USER"; But then I got another error SQL Error: ORA-00942: table or view does not exist What is the correct way to escape user name + reserved keyword combination ? UPDATE: What's about table alias do I have to use double quotes too ? If you have created the table using quoted identifier , then
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