keyword

What really is the purpose of “base” keyword in c#?

由 ぃ、小莉子 提交于 2019-11-27 00:20:45
问题 Thus for used base class for some commom reusable methods in every page of my application... public class BaseClass:System.Web.UI.Page { public string GetRandomPasswordUsingGUID(int length) { string guidResult = System.Guid.NewGuid().ToString(); guidResult = guidResult.Replace("-", string.Empty); return guidResult.Substring(0, length); } } So if i want to use this method i would just do, public partial class forms_age_group : BaseClass { protected void Page_Load(object sender, EventArgs e) {

When to use static keyword before global variables?

由 可紊 提交于 2019-11-26 23:58:57
Can someone explain when you're supposed to use the static keyword before global variables or constants defined in header files? For example, lets say I have a header file with the line: const float kGameSpriteWidth = 12.0f; Should this have static in front of const or not? What are some best practices for using static ? static renders variable local to the file which is generally a good thing, see for example this Wikipedia entry . You should not define global variables in header files. You should define them in .c source file. If global variable is to be visible within only one .c file, you

Why are override and final identifiers with special meaning instead of reserved keywords?

由 本秂侑毒 提交于 2019-11-26 23:06:09
问题 Both the override specifier and final specifier were added in C++11. They differ from other specifiers added to C++11 such as constexpr and decltype, in that they are not keywords and so are available for use as identifiers: int main() { int override = 0 ; // Ok int final = 0 ; // Ok //int constexpr = 0 ; // Error } They are referred to as identifiers with special meaning , which is covered in the draft C++11 standard section 2.11 [lex.name] ( emphasis mine ): The identifiers in Table 3 have

Practical use of `stackalloc` keyword

由 旧时模样 提交于 2019-11-26 22:31:33
问题 Has anyone ever actually used stackalloc while programming in C#? I am aware of what is does, but the only time it shows up in my code is by accident, because Intellisense suggests it when I start typing static , for example. Although it is not related to the usage scenarios of stackalloc , I actually do a considerable amount of legacy interop in my apps, so every now and then I could resort to using unsafe code. But nevertheless I usually find ways to avoid unsafe completely. And since stack

What is the difference between “AS” and “IS” in an Oracle stored procedure?

由 混江龙づ霸主 提交于 2019-11-26 21:38:12
I see Oracle procedures sometimes written with "AS", and sometimes with "IS" keyword. CREATE OR REPLACE Procedure TESTUSER.KILLINSTANCE (INSTANCEID integer) **AS** ... vs. CREATE OR REPLACE Procedure TESTUSER.KILLINSTANCE (INSTANCEID integer) **IS** ... Is there any difference between the two? Edit: Apparently, there is no functional difference between the two, but some people follow a convention to use "AS" when the SP is part of a package and "IS" when it is not. Or the other way 'round. Meh. None whatsover. They are synonyms supplied to make your code more readable: FUNCTION f IS ... CREATE

What does $this mean in PHP? [duplicate]

由 怎甘沉沦 提交于 2019-11-26 21:34:54
问题 Possible Duplicate: PHP: self vs this Hello, Could you help me understanding the meaning of the PHP variable name $this ? Thank you for your help. 回答1: $this refers to the class you are in. For example Class Car { function test() { return "Test function called"; } function another_test() { echo $this->test(); // This will echo "Test function called"; } } Hope this helps. 回答2: You might want to have a look at the answers in In PHP5, what is the difference between using self and $this? When is

Is there any reason to use the 'auto' keyword in C++03?

由 本秂侑毒 提交于 2019-11-26 21:29:13
Note this question was originally posted in 2009, before C++11 was ratified and before the meaning of the auto keyword was drastically changed. The answers provided pertain only to the C++03 meaning of auto -- that being a storage class specified -- and not the C++11 meaning of auto -- that being automatic type deduction. If you are looking for advice about when to use the C++11 auto , this question is not relevant to that question. For the longest time I thought there was no reason to use the static keyword in C, because variables declared outside of block-scope were implicitly global. Then I

Are PHP keywords case-sensitive?

由 那年仲夏 提交于 2019-11-26 20:59:25
问题 For example, is the following program meaningful, and if so what should it print? <?php FuncTIon fOo($x) { eChO $x; } FOO('bar'); IF (TRuE) { echO 'qux'; } ?> My interpreter runs it and prints barqux , implying the keywords are not case-sensitive: $ php case_sensitive_keywords.php barqux $ php --version PHP 5.5.7-1+sury.org~precise+1 (cli) (built: Dec 12 2013 21:37:40) However, this same question was asked last year, and the answers say that keywords are case-sensitive, in direct

Is 'file' a keyword in python?

由 孤人 提交于 2019-11-26 20:51:12
问题 Is file a keyword in python? I've seen some code using the keyword file just fine, while others have suggested not to use it and my editor is color coding it as a keyword. 回答1: No, file is a builtin, not a keyword: >>> import keyword >>> keyword.iskeyword('file') False >>> import __builtin__ >>> hasattr(__builtin__, 'file') True It can be seen as an alias for open() , but it has been removed from Python 3, as the new io framework replaced it. Technically, it is the type of object returned by

How to add builtin functions

由 ≡放荡痞女 提交于 2019-11-26 19:08:01
I am new to python programming. How can I add new built-in functions and keywords to python interpreter using C or C++? David Wolever In short, it is technically possible to add things to Python's builtins † , but it is almost never necessary (and generally considered a very bad idea). In longer, it's obviously possible to modify Python's source and add new builtins, keywords, etc… But the process for doing that is a bit out of the scope of the question as it stands. If you'd like more detail on how to modify the Python source, how to write C functions which can be called from Python, or
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