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  • C++ variable alias - what's that exactly, and why is it better to turn if off?

    - by Poni
    I've read the essay Surviving the Release Version. Under the "Aliasing bugs" clause it says: You can get tighter code if you tell the compiler that it can assume no aliasing.... I've also read Aliasing (computing). What exactly is a variable alias? I understand it means using a pointer to a variable is an alias, but, how/why does it affect badly, or in other words - why telling the compiler that it can assume no aliasing would get me a "tighter code"

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  • Why Swift is 100 times slower than C in this image processing test?

    - by xiaobai
    Like many other developers I have been very excited at the new Swift language from Apple. Apple has boasted its speed is faster than Objective C and can be used to write operating system. And from what I learned so far, it's a very type-safe language and able to have precisely control over the exact data type (like integer length). So it does look like having good potential handling performance critical tasks, like image processing, right? That's what I thought before I carried out a quick test. The result really surprised me. Here is a much simplified image alpha blending code snippet in C: test.c: #include <stdio.h> #include <stdint.h> #include <string.h> uint8_t pixels[640*480]; uint8_t alpha[640*480]; uint8_t blended[640*480]; void blend(uint8_t* px, uint8_t* al, uint8_t* result, int size) { for(int i=0; i<size; i++) { result[i] = (uint8_t)(((uint16_t)px[i]) *al[i] /255); } } int main(void) { memset(pixels, 128, 640*480); memset(alpha, 128, 640*480); memset(blended, 255, 640*480); // Test 10 frames for(int i=0; i<10; i++) { blend(pixels, alpha, blended, 640*480); } return 0; } I compiled it on my Macbook Air 2011 with the following command: gcc -O3 test.c -o test The 10 frame processing time is about 0.01s. In other words, it takes the C code 1ms to process one frame: $ time ./test real 0m0.010s user 0m0.006s sys 0m0.003s Then I have a Swift version of the same code: test.swift: let pixels = UInt8[](count: 640*480, repeatedValue: 128) let alpha = UInt8[](count: 640*480, repeatedValue: 128) let blended = UInt8[](count: 640*480, repeatedValue: 255) func blend(px: UInt8[], al: UInt8[], result: UInt8[], size: Int) { for(var i=0; i<size; i++) { var b = (UInt16)(px[i]) * (UInt16)(al[i]) result[i] = (UInt8)(b/255) } } for i in 0..10 { blend(pixels, alpha, blended, 640*480) } The build command line is: xcrun swift -O3 test.swift -o test Here I use the same O3 level optimization flag to make the comparison hopefully fair. However, the resulting speed is 100 time slower: $ time ./test real 0m1.172s user 0m1.146s sys 0m0.006s In other words, it takes Swift ~120ms to processing one frame which takes C just 1 ms. I also verified the memory initialization time in both test code are very small compared to the blend processing function time. What happened?

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  • CSS Error when using jQuery's gt() selector?

    - by kimka
    I've noticed that Firefox throws me a warning on the following jQuery code: $("li.example div.code:gt(4)").hide(); CSS Error: Unknown pseudo-class or pseudo-element 'gt'. According to jQuery, it all should be correct. And it works, but I wonder how to fix this error for cleanness sake.

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  • How to remove certain lists from a list of lists using python?

    - by seaworthy
    I can not figure out why my code does not filter out lists from a predefined list. I am trying to remove specific list using the following code. data = [[1,1,1],[1,1,2],[1,2,1],[1,2,2],[2,1,1],[2,1,2],[2,2,1],[2,2,2]] data = [x for x in data if x[0] != 1 and x[1] != 1] print data My result: data = [[2, 2, 1], [2, 2, 2]] Expected result: data = [[1,2,1],[1,2,2],[2,1,1],[2,1,2],[2,2,1],[2,2,2]]

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  • No Change for Index of DropDownList in a Custom Control!!!

    - by mahdiahmadirad
    Hi Dears, I have Created A Custom Control which is a DropDownList with specified Items. I designed AutoPostback and SelectedCategoryId as Properties and SelectedIndexChanged as Event for My Custom Control. Here Is My ASCX file Behind Code: private int _selectedCategoryId; private bool _autoPostback = false; public event EventHandler SelectedIndexChanged; public void BindData() { //Some Code... } protected void Page_Load(object sender, EventArgs e) { BindData(); DropDownList1.AutoPostBack = this._autoPostback; } public int SelectedCategoryId { get { return int.Parse(this.DropDownList1.SelectedItem.Value); } set { this._selectedCategoryId = value; } } public string AutoPostback { get { return this.DropDownList1.AutoPostBack.ToString(); } set { this._autoPostback = Convert.ToBoolean(value); } } protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { if (SelectedIndexChanged != null) SelectedIndexChanged(this, EventArgs.Empty); } I Want Used Update Panel to Update Textbox Fields According to dorp down list selected index. this is my code in ASPX page: <asp:Panel ID="PanelCategory" runat="server"> <p> Select Product Category:&nbsp; <myCtrl:CategoryDDL ID="CategoryDDL1" AutoPostback="true" OnSelectedIndexChanged="CategoryIndexChanged" SelectedCategoryId="0" runat="server" /> </p> <hr /> </asp:Panel> <asp:UpdatePanel ID="UpdatePanelEdit" runat="server"> <ContentTemplate> <%--Some TextBoxes and Other Controls--%> </ContentTemplate> <Triggers> <asp:PostBackTrigger ControlID="CategoryDDL1" /> </Triggers> </asp:UpdatePanel> But Always The Selected Index of CategoryDDL1 is 0(Like default). this means Only Zero Value will pass to the event to update textboxes Data. what is the wrong with my code? why the selected Index not Changing? Help?

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  • Graph of included files

    - by Dacav
    When I work on someone else's code, I tipically need to abuse of grep in order to find data types declarations etc, and this usually makes me confused. I'd like to have some tool which analyzes the source code and produces some graphviz-like drawing and allows me to follow dependencies. Also I've found this on the internet, but I think is taylored for the linux kernel only.

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  • [iPhone Obj-C] How to move a label with the wave of the iPhone?

    - by Didi
    The code below is from the book Beginning iPhone 3 Development, chapter 15, using the accelerometer to control a ball. I want to use a label instead of the ball, and only move in the x direction. However, I donno how to revise the code to achieve this goal. Can anyone please help me? THX so much!!!! (id)initWithCoder:(NSCoder *)coder { if (self = [super initWithCoder:coder]) { self.image = [UIImage imageNamed:@"ball.png"]; self.currentPoint = CGPointMake((self.bounds.size.width / 2.0f) + (image.size.width / 2.0f), (self.bounds.size.height / 2.0f) + (image.size.height / 2.0f)); ballXVelocity = 0.0f; ballYVelocity = 0.0f; } return self; } (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { // Initialization code } return self; } (void)drawRect:(CGRect)rect { // Drawing code [image drawAtPoint:currentPoint]; } (void)dealloc { [image release]; [acceleration release]; [super dealloc]; } //#pragma mark - - (CGPoint)currentPoint { return currentPoint; } - (void)setCurrentPoint:(CGPoint)newPoint { previousPoint = currentPoint; currentPoint = newPoint; if (currentPoint.x < 0) { currentPoint.x = 0; //ballXVelocity = 0; ballXVelocity = - (ballXVelocity / 2.0); } if (currentPoint.y < 0){ currentPoint.y = 0; //ballYVelocity = 0; ballYVelocity = - (ballYVelocity / 2.0); } if (currentPoint.x > self.bounds.size.width - image.size.width) { currentPoint.x = self.bounds.size.width - image.size.width; //ballXVelocity = 0; ballXVelocity = - (ballXVelocity / 2.0); } if (currentPoint.y > self.bounds.size.height - image.size.height) { currentPoint.y = self.bounds.size.height - image.size.height; //ballYVelocity = 0; ballYVelocity = - (ballYVelocity / 2.0); } CGRect currentImageRect = CGRectMake(currentPoint.x, currentPoint.y, currentPoint.x + image.size.width, currentPoint.y + image.size.height); CGRect previousImageRect = CGRectMake(previousPoint.x, previousPoint.y, previousPoint.x + image.size.width, currentPoint.y + image.size.width); [self setNeedsDisplayInRect:CGRectUnion(currentImageRect, previousImageRect)]; } (void)draw { static NSDate *lastDrawTime; if (lastDrawTime != nil) { NSTimeInterval secondsSinceLastDraw = -([lastDrawTime timeIntervalSinceNow]); ballYVelocity = ballYVelocity + -(acceleration.y * secondsSinceLastDraw); ballXVelocity = ballXVelocity + acceleration.x * secondsSinceLastDraw; CGFloat xAcceleration = secondsSinceLastDraw * ballXVelocity * 500; CGFloat yAcceleration = secondsSinceLastDraw * ballYVelocity * 500; self.currentPoint = CGPointMake(self.currentPoint.x + xAcceleration, self.currentPoint.y +yAcceleration); } // Update last time with current time [lastDrawTime release]; lastDrawTime = [[NSDate alloc] init]; }

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  • subview is not added immediately (iphone)

    - by Jonathan
    When the return button on the keyboard for a textfield is tapped I want to add a UIView, then connect to a website with NSURlConnection sendsynchronousrequest and I have the code in that order But when I run in the simulator (I can't run on device) the connection is run first then the subview is added (ie the opposite of the order of the code) Why is this and how can stop it, because I want the view to added, then the connection done and then the view removed.

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  • How to resize an image smoothly (with resampling) using Windows API calls?

    - by Clay Nichols
    I need to resize images and resample them so they don't end up all jagged (I think that's called aliasing). I found some code (sorry, lost the link) that does this in pure VB6 code but it's a bit slow (2-5 seconds) and I'm displaying pictures in real time so I need something faster. I seem to recall seeing some examples of doing this with the GDI+ library. An example in VB6 would be ideal, but I can probably work with a simple example with Windows API calls in another language.

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  • High accuracy cpu timers

    - by John Robertson
    An expert in highly optimized code once told me that an important part of his strategy was the availability of extremely high performance timers on the CPU. Does anyone know what those are and how one can access them to test various code optimizations? While I am interested regardless, I also wanted to ask whether it is possible to access them from something higher than assembly (or with only a little assembly) via visual studio C++?

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  • C# recursive programming with lists

    - by David Torrey
    I am working on a program where each item can hold an array of items (i'm making a menu, which has a tree-like structure) currently i have the items as a list, instead of an array, but I don't feel like I'm using it to its full potential to simplify code. I chose a list over a standard array because the interface (.add, .remove, etc...) makes a lot of sense. I have code to search through the structure and return the path of the name (i.e. Item.subitem.subsubitem.subsubsubitem). Below is my code: public class Item { //public Item[] subitem; <-- Array of Items public List<Item> subitem; // <-- List of Items public Color itemColor = Color.FromArgb(50,50,200); public Rectangle itemSize = new Rectangle(0,0,64,64); public Bitmap itemBitmap = null; public string itemName; public string LocateItem(string searchName) { string tItemName = null; //if the item name matches the search parameter, send it up) if (itemName == searchName) { return itemName; } if (subitem != null) { //spiral down a level foreach (Item tSearchItem in subitem) { tItemName = tSearchItem.LocateItem(searchName); if (tItemName != null) break; //exit for if item was found } } //do name logic (use index numbers) //if LocateItem of the subitems returned nothing and the current item is not a match, return null (not found) if (tItemName == null && itemName != searchName) { return null; } //if it's not the item being searched for and the search item was found, change the string and return it up if (tItemName != null && itemName != searchName) { tItemName.Insert(0, itemName + "."); //insert the parent name on the left --> TopItem.SubItem.SubSubItem.SubSubSubItem return tItemName; } //default not found return null; } } My question is if there is an easier way to do this with lists? I've been going back and forth in my head as to whether I should use lists or just an array. The only reason I have a list is so that I don't have to make code to resize the array each time I add or remove an item.

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  • Strange (atleast for me) behavior in Django template

    - by lud0h
    The following code snippet in a Django template (v 1.1) doesn't work. {{ item.vendors.all.0 }} == returns "Test" but the following code snippet, doesn't hide the paragraph! {% ifnotequal item.vendors.all.0 "Test" %} <p class="view_vendor">Vendor(s): {{item.vendors.all.0}} </p><br /> {% endifnotequal %} Any tips on what's wrong? Thanks.

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  • Pass PHP variables without being seen when working with a database generated list

    - by Wilcoholic
    Looking for any help regarding the problem. Here's the deal: I have a database that has a teams table and it contains team_id. On one of my pages, I generate a list of links that contain the team_id of the creator in their get URL. I need the team_id on the next page but can't figure out how to pass it through any other way. Using a form and POST isn't an option because this method would only pass through the last links data on the list. Storing in a session isn't an option either because there is no way to discretely pass the the variables I need to a function to set the session variables. I have tried and it can pretty easily be viewed from viewing the source code. So here's some sample code to see exactly what I'm dealing with. <? if(mysql_num_rows($result2)>0){ ?> <a class="fltrt btn btn-danger btn-small" onclick="test()" href="acceptmatch-exec.php?match_id=<?php echo $match_id; ?>&team_id=<?php echo $team_id;?>&action=cancel">Cancel Match</a> <?}else{?> <a class="fltrt btn btn-success btn-small" href="acceptmatch-exec.php?match_id=<?php echo $match_id; ?>&team_id=<?php echo $team_id;?>&action=accept">Accept Match</a> <?} ?> The code above is generated multiple times on a page via a while loop that was excluded. I want to pass the match_id and team_id variables without being seen anywhere. If I made this a form, it wouldn't pass the correct variables unless there is only one result at the time (not likely). I'm sure there has to be an easy method that is eluding me, so please share thoughts on how to solve this. I feel as though I am not explaining it well enough, but it's not really easy to explain. I basically want something that works like GET but acts like POST and can be hidden from people viewing source code or link locations. Thanks

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  • Does binding temporary to a reference require a copy constructor in C++?

    - by vitaut
    Consider the following code: class A { A(const A&); public: A() {} }; int main() { const A &a = A(); } This code compiles fine with GCC, but fails to compile with Visual C++ with the following error: test.cc(8) : error C2248: 'A::A' : cannot access private member declared in class 'A' test.cc(2) : see declaration of 'A::A' test.cc(1) : see declaration of 'A' So is it necessary to have a copy constructor accessible when binding a temporary to a reference?

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  • Best practices for handling binary data in Ruby?

    - by StackedCrooked
    What are the best practices for reading and writing binary data in Ruby? In the code sample below I needed to send a binary file using over HTTP (as POST data): f = File.new("resp.der", "r") # binary file begin while true out.syswrite(f.sysread(1)) # out is an output stream (type IO) end rescue EOFError => err puts "Sent response." end While this code seems to do a good job, it probably isn't very idiomatic. How can I improve it?

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  • Javascript variables

    - by Uli
    I'm learning Javascript right now. Can anybody tell me why the second code block traces a empty path for -launch(this)- but using the first code block it gives me the right path? "<form action='"+launchwebsite+"/subsite/' method='post' target='_blank' onsubmit='launch(this)'>" and this not: "<a onclick='launch(this)' title='launch' class='iblack' /></a></div>" Best Uli

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  • disable Opera function key in javascript

    - by DonDon
    I'm writing javascript code for a web emulator containing function keys. The user is able to press keyboard function keys to process something in the emulator, I used stopPropagation and preventDefault javascript function to stop/cancel browsers invoking their function key shortcut (e.g. F1 will invoke Firefox to open its help page) and the code works fine under Firefox and Chrome. But Opera didn't work. I'm using latest Opera 10.5 here. Can anyone help ?

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  • Help translating from assembly to C

    - by user324994
    I have some code from a function subl $24, %esp movl 8(%ebp), %eax cmpl 12(%ebp), %eax Before the code is just the 'ENTER' command and afterwards there's an if statement to return 1 if ebp eax or 0 if it's less. I'm assuming cmpl means compare, but I can't tell what the concrete values are. Can anyone tell me what's happening?

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  • Script-Based Configuration in .net?

    - by Michael Stum
    One of the downsides of web.config/app.config is that it's just Magic Strings everywhere, since it's just an XML file. Interpreted languages like PHP or Ruby have the advantage that the configuration is just code that is executed. In .net, doing stuff in code requires a redeployment, which defeats the purpose. Now, before I build my own web.config replacement based on Boo or PowerShell I wanted to know if there is an existing one?

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  • Netbeans braces placement issue

    - by KeyStroke
    Hi there, I'm trying to get Netbeans PHP to let me write braces in a new line instead of the same line, I mean like this: if($something == TRUE) { // some code here } However, when I write if($something == TRUE) then hit enter, Netbeans places the cursor incorrectly in the new line, like this: if($something == TRUE) { // some code here } I've already changed the braces placement option to be "New Line", but this still doesn't work properly. Any idea how I can fix this? Appreciate your help

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  • What is the most robust way of determining the current codepage from a shell script?

    - by rewbs
    Hi all, I'd like to determine the environment's current codepage at runtime from a Unix shell script. What's the most reliable way of doing this? I'm looking into parsing environment variable $LC_ALL, but it isn't always set to a useful value, and its format seems to vary (can be <locale, or <locale.<code page, or <locale.<code page@<modifier etc...). Is there a better way? I'm essentially after a shell equivalent of what I'd get if I called nl_langinfo(CODESET) from C.

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