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Convert a character digit to the corresponding integer in C

...the same for letters, for example: char c = 'b'; int x = c - 'a'; // x is now not necessarily 1 The standard guarantees that the char values for the digits '0' to '9' are contiguous, but makes no guarantees for other characters like letters of the alphabet. ...
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Using Notepad++ to validate XML against an XSD

...r use Menu if this is your preference Plugins > XML Tools > Validate Now). Following dialog will open: Click on .... Point to XSD file and I am pretty sure you'll be able to handle things from here. Hope this saves you some time. EDIT: Plugin manager was not included in some versions of No...
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Request Monitoring in Chrome

... I know this is an old thread but I thought I would chime in. Chrome currently has a solution built in. Use CTRL+SHIFT+I (or navigate to Current Page Control > Developer > Developer Tools. In the newer versions of C...
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What is the copy-and-swap idiom?

...rray); // (3) } return *this; } And we say we're finished; this now manages an array, without leaks. However, it suffers from three problems, marked sequentially in the code as (n). The first is the self-assignment test. This check serves two purposes: it's an easy way to prevent us fr...
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JavaScript closures vs. anonymous functions

...ree variable. That free variable is called an upvalue of the closure F. Now let's use this to figure out who uses closures and who doesn't (for the sake of explanation I have named the functions): Case 1: Your Friend's Program for (var i = 0; i < 10; i++) { (function f() { var i2...
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How do I get the day of the week with Foundation?

...ter alloc] init] ; [dateFormatter setDateFormat:@"EEEE"]; NSDate *now = [[NSDate alloc] init]; NSString *dateString = [format stringFromDate:now]; NSString *theDate = [dateFormat stringFromDate:now]; NSString *theTime = [timeFormat stringFromDate:now]; NSString *week = [dat...
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Get property value from string using reflection

...null value of an existing property or no property at all? I'd much rather know immediately that I was sending in a bad property name. This is not production code, but a better improvement would be to throw a more specific exception (e.g. check for null on GetProperty and throw PropertyNotFoundExcept...
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搭建高可用mongodb集群(二)—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...

... rs.initiate(config); #输出成功 { "info" : "Config now saved locally. Should come online in about a minute.", "ok" : 1 } #查看日志,副本集启动成功后,138为主节点PRIMARY,136、137为副本节点SECONDARY。 Sun Dec 29 20:26:13.842 [conn3]...
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Why call git branch --unset-upstream to fixup?

... version: remote-tracking branch origin/master used to exist, but does not now, so local branch source is tracking something that does not exist, which is suspicious at best—it means a different Git feature is unable to do anything for you—and Git is warning you about it. You have been getting ...
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HTML5 form required attribute. Set custom validation message?

...field empty it shows the message, then enter something in the field but it now shows an empty message and the action isn't executed. If you now click the button again, it will go through. – thomasvdb Sep 6 '12 at 11:36 ...