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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to get a module to pass the syntax check in ISE 12.4, and it gives me an error I don't understand. First a code snippet: parameter ROWBITS = 4; reg [ROWBITS-1:0] temp; genvar c; generate always @(posedge sysclk) begin for (c = 0; c When I try a syntax check, I get the following error message: ERROR:HDLCompiler:731 - "test.v" Line 46: Procedural assignment to a non-register is not permitted. I really don't understand why it's complaining. "c" isn't a wire, it's a genvar. This should be the equivalent of the completely legal syntax:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to make sure a float in PHP is rounded up if any decimal is present, without worrying about mathematical rounding rules. This function would work as follows: 1.1 to 2 1.2 to 2 1.9 to 2 2.3 to 3 2.8 to 3 I know the round() function exists but I don't see any function for rounding up if any decimal is found. Is there any easy way to do this? 回答1: Use the ceil function: $number = ceil(1.1); //2 回答2: I know this is an old topic, however it appears in Google. I will extend Blake Plumb's answer regarding precision. ceil(1024.321 * 100) /

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have a new install of Rails and am trying to set up authentication with Devise. As far as I can tell I have a very basic set up that should work, but whenever I try to log in with the default Devise sign in form I get an Unauthorized error. I am sure my credentials are correct as I created a User to test with in the console like so: User . new ({: email => 'mark@markdavies.com.au' , : priv_level => 'admin' , : password => 'mypassword' , : password_confirmation => 'mypassword' }). save My User model: class User < ActiveRecord ::

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: According to the Wikipedia page Segmentation fault , a bus error can be caused by unaligned memory access. The article gives an example about how to trigger a bus error. In the example, we have to enable alignment checking to see the bus error. What if we disable such alignment checking? The program seems to work properly. I have a program access unaligned memory frequently, and it is used by quite a few people, but no one reports bus errors or other weird results to me. If we disable alignment checking, what is the side effect of

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: BuildConfig.DEBUG is not working (= logically set to false) when I run my app in debug mode. I use gradle to build.I have a library project where I do this check. BuildConfig.java looks like this in the build debug folder: /** Automatically generated file. DO NOT MODIFY */ package common.myProject; public final class BuildConfig { public static final boolean DEBUG = Boolean.parseBoolean("true"); } and in the release folder: public static final boolean DEBUG = false; both in the library project and in the application project. I tried to get

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: If I run a query such as: SELECT COUNT (*) as num FROM table WHERE x = 'y' Will it always return a result, even when the query doesn't match any record? Or do I need to validate and make sure a row is returned as the result? 回答1: Yes, because it's an aggregate and returns zero. Unless you add GROUP BY in which case no result because there is no group... MAX/SUM etc would return NULL unless you add GROUP BY then no rows. Only COUNT returns a number for no results Edit, a bit late: SUM would return NULL like MAX Edit, May 2013: this

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have tried using find and findOne and both are not returning a document. find is returning an empty array while findOne is returning null . err in both cases in null as well. Here is my connection: function connectToDB(){ mongoose.connect("mongodb://localhost/test"); //i have also tried 127.0.0.1 db = mongoose.connection; db.on("error", console.error.bind(console, "connection error:")); db.once("open", function callback(){ console.log("CONNECTED"); }); }; Here is me schema: var fileSchema = mongoose.Schema({ hash: String, type: String,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: A window should stay on top of all other windows. Is this somehow possible with plain x11/xlib? Googling for "Always on top" and "x11" / "xlib" didn't return anything useful. I'd avoid toolkits like GTK+, if somehow possible. I'm using Ubuntu with gnome desktop. In the window menu, there's an option "Always On Top". Is this provided by the X server or the window manager? If the second is the case, is there a general function that can be called for nearly any wm? Or how to do this in an "X11-generic" way? Edit: I implemented fizzer's answer,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: UNIX timestamp always in GMT? I tried to run php function time() and when I tried to convert the unix timestamp from the time() function, the output is not similar to the computer time. Thank You 回答1: yep, UNIX timestamp represents how much seconds past from unix-time epoch in GMT+0 回答2: UNIX timestamp (A.K.A. Unix's epoch) means elapsed seconds since January 1st 1970 00:00:00 UTC (Universal Time). So , if you need the time in a specific TimeZone, you should convert it. Even though is technically possible, I would recommend alternative ways

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This question already has an answer here: What's the difference between the atomic and nonatomic attributes? 26 answers It is said that nonatomic option will make your setter method run faster. I googled it but am not able to understand. Could someone tell me why? 回答1: Declaring a property atomic makes compiler generate additional code that prevents concurrent access to the property. This additional code locks a semaphore, then gets or sets the property, and then unlock the semaphore. Compared to setting or getting a primitive value or a