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  • Why can't I assign a scalar value to a class using shorthand, but instead declare it first, then set

    - by ~delan-azabani
    I am writing a UTF-8 library for C++ as an exercise as this is my first real-world C++ code. So far, I've implemented concatenation, character indexing, parsing and encoding UTF-8 in a class called "ustring". It looks like it's working, but two (seemingly equivalent) ways of declaring a new ustring behave differently. The first way: ustring a; a = "test"; works, and the overloaded "=" operator parses the string into the class (which stores the Unicode strings as an dynamically allocated int pointer). However, the following does not work: ustring a = "test"; because I get the following error: test.cpp:4: error: conversion from ‘const char [5]’ to non-scalar type ‘ustring’ requested Is there a way to workaround this error? It probably is a problem with my code, though. The following is what I've written so far for the library: #include <cstdlib> #include <cstring> class ustring { int * values; long len; public: long length() { return len; } ustring * operator=(ustring input) { len = input.len; values = (int *) malloc(sizeof(int) * len); for (long i = 0; i < len; i++) values[i] = input.values[i]; return this; } ustring * operator=(char input[]) { len = sizeof(input); values = (int *) malloc(0); long s = 0; // s = number of parsed chars int a, b, c, d, contNeed = 0, cont = 0; for (long i = 0; i < sizeof(input); i++) if (input[i] < 0x80) { // ASCII, direct copy (00-7f) values = (int *) realloc(values, sizeof(int) * ++s); values[s - 1] = input[i]; } else if (input[i] < 0xc0) { // this is a continuation (80-bf) if (cont == contNeed) { // no need for continuation, use U+fffd values = (int *) realloc(values, sizeof(int) * ++s); values[s - 1] = 0xfffd; } cont = cont + 1; values[s - 1] = values[s - 1] | ((input[i] & 0x3f) << ((contNeed - cont) * 6)); if (cont == contNeed) cont = contNeed = 0; } else if (input[i] < 0xc2) { // invalid byte, use U+fffd (c0-c1) values = (int *) realloc(values, sizeof(int) * ++s); values[s - 1] = 0xfffd; } else if (input[i] < 0xe0) { // start of 2-byte sequence (c2-df) contNeed = 1; values = (int *) realloc(values, sizeof(int) * ++s); values[s - 1] = (input[i] & 0x1f) << 6; } else if (input[i] < 0xf0) { // start of 3-byte sequence (e0-ef) contNeed = 2; values = (int *) realloc(values, sizeof(int) * ++s); values[s - 1] = (input[i] & 0x0f) << 12; } else if (input[i] < 0xf5) { // start of 4-byte sequence (f0-f4) contNeed = 3; values = (int *) realloc(values, sizeof(int) * ++s); values[s - 1] = (input[i] & 0x07) << 18; } else { // restricted or invalid (f5-ff) values = (int *) realloc(values, sizeof(int) * ++s); values[s - 1] = 0xfffd; } return this; } ustring operator+(ustring input) { ustring result; result.len = len + input.len; result.values = (int *) malloc(sizeof(int) * result.len); for (long i = 0; i < len; i++) result.values[i] = values[i]; for (long i = 0; i < input.len; i++) result.values[i + len] = input.values[i]; return result; } ustring operator[](long index) { ustring result; result.len = 1; result.values = (int *) malloc(sizeof(int)); result.values[0] = values[index]; return result; } char * encode() { char * r = (char *) malloc(0); long s = 0; for (long i = 0; i < len; i++) { if (values[i] < 0x80) r = (char *) realloc(r, s + 1), r[s + 0] = char(values[i]), s += 1; else if (values[i] < 0x800) r = (char *) realloc(r, s + 2), r[s + 0] = char(values[i] >> 6 | 0x60), r[s + 1] = char(values[i] & 0x3f | 0x80), s += 2; else if (values[i] < 0x10000) r = (char *) realloc(r, s + 3), r[s + 0] = char(values[i] >> 12 | 0xe0), r[s + 1] = char(values[i] >> 6 & 0x3f | 0x80), r[s + 2] = char(values[i] & 0x3f | 0x80), s += 3; else r = (char *) realloc(r, s + 4), r[s + 0] = char(values[i] >> 18 | 0xf0), r[s + 1] = char(values[i] >> 12 & 0x3f | 0x80), r[s + 2] = char(values[i] >> 6 & 0x3f | 0x80), r[s + 3] = char(values[i] & 0x3f | 0x80), s += 4; } return r; } };

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  • Initializing PHP class property declarations with simple expressions yields syntax error

    - by user171929
    According to the PHP docs, one can initialize properties in classes with the following restriction: "This declaration may include an initialization, but this initialization must be a constant value--that is, it must be able to be evaluated at compile time and must not depend on run-time information in order to be evaluated." I'm trying to initialize an array and having some issues. While this works fine: public $var = array( 1 => 4, 2 => 5, ); This creates a syntax error: public $var = array( 1 => 4, 2 => (4+1), ); Even this isn't accepted: public $var = 4+1; which suggests it's not a limitation of the array() language construct. Now, the last time I checked, "4+1" equated to a constant value that not only should be accepted, but should in fact be optimized away. In any case, it's certainly able to be evaluated at compile-time. So what's going on here? Is the limitation really along the lines of "cannot be any calculated expression at all", versus any expression "able to be evaluated at compile time"? The use of "evaluated" in the doc's language suggests that simple calculations are permitted, but alas.... If this is a bug in PHP, does anyone have a bug ID? I tried to find one but didn't have any luck.

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  • Lib Files and Defines

    - by Paul
    I'm using a couple of external libraries and I'd rather not have to include all their source and header files in my main source directory or in my project file. One option would be to compile the libraries as lib files and link them like that. However I'm not sure the defines get evaluated before or after the lib file gets created (which one is it?). If it's before then obviously I can't just pack them because they might not work properly on different compilers or systems. So if I can't pack the libraries as lib files, is there any way for me to link in the c or cpp source files? Probably not, since they would have to be compiled first, but maybe I'm wrong. Edit: Here's a follow-up question, based on answers. Do you think it'd be too much of a hassle to have a makefile that creates the lib files? I'd still rather not add the sources to my project or in my source directory.

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  • How to define a DataTemplate in code?

    - by Asim Sajjad
    How can I create dataTemplate in code (using C#) and then add control to that DataTemplate ? <data:DataGrid.RowDetailsTemplate> <DataTemplate> <Border> <Border Margin="10" Padding="10" BorderBrush="SteelBlue" BorderThickness="3" CornerRadius="5"> <TextBlock Text="{Binding Description}" TextWrapping="Wrap" FontSize="10"> </TextBlock> </Border> </Border> </DataTemplate> </data:DataGrid.RowDetailsTemplate> I am using Sivlerlight.

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  • asp.net mvc custom membership provider - define application

    - by ile
    I created custom membership provider for asp.net mvc applications and it all works fine except one thing: when logged in to my application, I am also logged in to all other asp.net mvc applications that I run using Visual Studio. I suppose this data is being pulled from cache because when I logout and try to login again in other application, I'm being rejected. In webconfig, I added applicationName in order to solve this but it didn't work: <membership defaultProvider="SAMembershipProvider" userIsOnlineTimeWindow="15"> <providers> <clear/> <add name="SAMembershipProvider" type="ShinyAnt.Membership.SAMembershipProvider, ShinyAnt" connectionStringName ="ShinyAntConnectionString" applicationName="MyApp" /> </providers> </membership> <roleManager defaultProvider="SARoleProvider" enabled="true" cacheRolesInCookie="true"> <providers> <clear/> <add name="SARoleProvider" type="ShinyAnt.Membership.SARoleProvider" connectionStringName ="ShinyAntConnectionString" applicationName="MyApp" /> </providers> </roleManager> Is there any method that I forgot to implement that is dealing with this problem or it is something else?

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  • How to define bold, italic using @font-face

    - by Felix
    I'm looking at the MDC page for the @font-face CSS rule, but I don't get one thing. I have separate files for bold, italic and bold + italic, how can I embed all three files in one @font-face rule? For example, if I have: @font-face { font-family: "DejaVu Sans"; src: url("./fonts/DejaVuSans.ttf") format("ttf"); } strong { font-family: "DejaVu Sans"; font-weight: bold; } The browser will not know what font to use for bold (because that files is DejaVuSansBold.ttf), so it will default to something I probably don't want. How can I tell the browser all the different variants I have for a certain font?

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  • How does mysql define DISTINCT() in reference documentation

    - by goran
    EDIT: This question is about finding definitive reference to MySQL syntax on SELECT modifying keywords and functions. /EDIT AFAIK SQL defines two uses of DISTINCT keywords - SELECT DISTINCT field... and SELECT COUNT(DISTINCT field) ... However in one of web applications that I administer I've noticed performance issues on queries like SELECT DISTINCT(field1), field2, field3 ... DISTINCT() on a single column makes no sense and I am almost sure it is interpreted as SELECT DISTINCT field1, field2, field3 ... but how can I prove this? I've searched mysql site for a reference on this particular syntax, but could not find any. Does anyone have a link to definition of DISTINCT() in mysql or knows about other authoritative source on this? Best EDIT After asking the same question on mysql forums I learned that while parsing the SQL mysql does not care about whitespace between functions and column names (but I am still missing a reference). As it seems you can have whitespace between functions and the parenthesis SELECT LEFT (field1,1), field2... and get mysql to understand it as SELECT LEFT(field,1) Similarly SELECT DISTINCT(field1), field2... seems to get decomposed to SELECT DISTINCT (field1), field2... and then DISTINCT is taken not as some undefined (or undocumented) function, but as SELECT modifying keyword and the parenthesis around field1 are evaluated as if they were part of field expression. It would be great if someone would have a pointer to documentation where it is stated that the whitespace between functions and parenthesis is not significant or to provide links to apropriate MySQL forums, mailing lists where I could raise a question to put this into reference. EDIT I have found a reference to server option IGNORE SPACE. It states that "The IGNORE SPACE SQL mode can be used to modify how the parser treats function names that are whitespace-sensitive", later on it states that recent versions of mysql have reduced this number from 200 to 30. One of the remaining 30 is COUNT for example. With IGNORE SPACE enabled both SELECT COUNT(*) FROM mytable; SELECT COUNT (*) FROM mytable; are legal. So if this is an exception, I am left to conclude that normally functions ignore space by default. If functions ignore space by default then if the context is ambiguous, such as for the first function on a first item of the select expression, then they are not distinguishable from keywords and the error can not be thrown and MySQL must accept them as keywords. Still, my conclusions feel like they have lot of assumptions, I would still be grateful and accept any pointers to see where to follow up on this.

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  • Can you define a ResourceDictionary.MergedDictionary together with other (local) resources in <Wind

    - by Jeremy Holt
    I would like to refer to a MergedDictionary together with locally declared resources in my Windows.Resources. However, I'm getting this error: "All objects added to an IDictionary must have a Key attribute or some other type of key associated with them." Is it possible to mix local resources together with imported resources in the same Window.Resources? The XAML is: <Window.Resources> <CollectionViewSource x:Key="cvsData" Source="{Binding Path=Data}"> <CollectionViewSource.GroupDescriptions> <PropertyGroupDescription PropertyName="Country"/> </CollectionViewSource.GroupDescriptions> </CollectionViewSource> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary x:Name="images" Source="pack://application:,,,/CoreWpfControls;component/Images.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Window.Resources> Thanks Jeremy

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  • how to define fill colours in ggplot histogram?

    - by Andreas
    I have the following simple data data <- structure(list(status = c(9, 5, 9, 10, 11, 10, 8, 6, 6, 7, 10, 10, 7, 11, 11, 7, NA, 9, 11, 9, 10, 8, 9, 10, 7, 11, 9, 10, 9, 9, 8, 9, 11, 9, 11, 7, 8, 6, 11, 10, 9, 11, 11, 10, 11, 10, 9, 11, 7, 8, 8, 9, 4, 11, 11, 8, 7, 7, 11, 11, 11, 6, 7, 11, 6, 10, 10, 9, 10, 10, 8, 8, 10, 4, 8, 5, 8, 7), statusgruppe = c(0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, NA, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0)), .Names = c("status", "statusgruppe"), class = "data.frame", row.names = c(NA, -78L )) from that I'd like to make a histogram: ggplot(data, aes(status))+ geom_histogram(aes(y=..density..), binwidth=1, colour = "black", fill="white")+ theme_bw()+ scale_x_continuous("Staus", breaks=c(min(data$status,na.rm=T), median(data$status, na.rm=T), max(data$status, na.rm=T)),labels=c("Low", "Middle", "High"))+ scale_y_continuous("Percent", formatter="percent") Now - i'd like for the bins to take colou according to value - e.g. bins with value 9 gets dark grey - everything else should be light grey. I have tried with "fill=statusgruppe", scale_fill_grey(breaks=9) etc. - but I can't get it to work. Any ideas?

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  • Mpi function define

    - by Simone
    I wrote a program in c using MPI (Message Passing Inteface) that compute recursively the inverse of a lower triangular matrix. Every cpu sends 2 submatrices to other two cpus, they compute them and they give them back to the cpu caller. When the cpu caller has its submatrices it has to perform a matrix multiplication. In the recurrence equation the bottle neck is matrix multiplication. I implemented parallel multiplication with mpi in c but i'm not able to embed it into a function. Is it possible? thanks, Simone

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  • Modelsim (XE III/Starter 6.4b) not allowing me to define a macro function

    - by montooner
    I'm working on a Xiling FPGA for a course project. Normally we use the lab computers, but I'm trying to install on my own computer. So, I'm trying to include a macro file using line: `include "Const.v" But the following macro function doesn't work. Any ideas why? `ifdef synthesis // if Synplify `define SYNPLIFY `define SYNTHESIS `define MACROSAFE `else // if not Synplify `ifdef MODELSIM `define SIMULATION `define MACROSAFE `else `define XST // synthesis translate_off // if XST then stop compiling `undef XST `define SIMULATION `define MODELSIM // synthesis translate_on // if XST then resume compiling `ifdef XST `define SYNTHESIS `define MACROSAFE `endif `endif `endif //------------------------------------------------------------------------------ //------------------------------------------------------------------------------ // Section: Log2 Macro // Desc: A macro to take the log base 2 of any number. Useful for // calculating bitwidths. Warning, this actually calculates // log2(x-1), not log2(x). //------------------------------------------------------------------------------ `ifdef MACROSAFE `define log2(x) ((((x) > 1) ? 1 : 0) + \ (((x) > 2) ? 1 : 0) + \ (((x) > 4) ? 1 : 0) + \ (((x) > 8) ? 1 : 0) + \ (((x) > 16) ? 1 : 0) + \ (((x) > 32) ? 1 : 0) + \ (((x) > 64) ? 1 : 0) + \ (((x) > 128) ? 1 : 0) + \ (((x) > 256) ? 1 : 0) + \ (((x) > 512) ? 1 : 0) + \ (((x) > 1024) ? 1 : 0) + \ (((x) > 2048) ? 1 : 0) + \ (((x) > 4096) ? 1 : 0) + \ (((x) > 8192) ? 1 : 0) + \ (((x) > 16384) ? 1 : 0) + \ (((x) > 32768) ? 1 : 0) + \ (((x) > 65536) ? 1 : 0) + \ (((x) > 131072) ? 1 : 0) + \ (((x) > 262144) ? 1 : 0) + \ (((x) > 524288) ? 1 : 0) + \ (((x) > 1048576) ? 1 : 0) + \ (((x) > 2097152) ? 1 : 0) + \ (((x) > 4194304) ? 1 : 0) + \ (((x) > 8388608) ? 1 : 0) + \ (((x) > 16777216) ? 1 : 0) + \ (((x) > 33554432) ? 1 : 0) + \ (((x) > 67108864) ? 1 : 0) + \ (((x) > 134217728) ? 1 : 0) + \ (((x) > 268435456) ? 1 : 0) + \ (((x) > 536870912) ? 1 : 0) + \ (((x) > 1073741824) ? 1 : 0)) `endif

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  • Xaml parse exception is thrown when i define a duplex contract

    - by Yaroslav
    Hi! I've got a WPF application containing a WCF service. The Xaml code is pretty simple: Enter your text here Send Address: Here is the service: namespace WpfApplication1 { [ServiceContract(CallbackContract=typeof(IMyCallbackContract))] public interface IMyService { [OperationContract(IsOneWay = true)] void NewMessageToServer(string msg); [OperationContract(IsOneWay = true)] bool ServerIsResponsible(); } [ServiceContract] public interface IMyCallbackContract { [OperationContract] void NewMessageToClient(string msg); [OperationContract] void ClientIsResponsible(); } /// <summary> /// Interaction logic for Window1.xaml /// </summary> public partial class Window1 : Window { public Window1() { InitializeComponent(); ServiceMetadataBehavior behavior = new ServiceMetadataBehavior(); //behavior.HttpGetEnabled = true; //behavior. ServiceHost serviceHost = new ServiceHost( typeof(MyService), new Uri("net.tcp://localhost:8080/")); serviceHost.Description.Behaviors.Add(behavior); serviceHost.AddServiceEndpoint( typeof(IMetadataExchange), MetadataExchangeBindings.CreateMexTcpBinding(), "mex"); serviceHost.AddServiceEndpoint( typeof(IMyService), new NetTcpBinding(), "ServiceEndpoint"); serviceHost.Open(); MessageBox.Show( "server is up"); // label1.Content = label1.Content + String.Format(" net.tcp://localhost:8080/"); } } public class MyService : IMyService { public void NewMessageToServer(string msg) { } public bool ServerIsResponsible() { return true; } } } I am getting a Xaml parse exception in Line 1, what can be the problem? Thanks!

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  • Jquery:: How can select clicked element in table without define unique id for each element

    - by Yosef
    Hello, I have table (that generated by server) below. I want to get input element value class="itemQuantity" of clicked row. I write Jquery code but he missing "this" of clicked element. <script type="text/javascript"> $(document).ready(function() { $('.updateButton').click(function() { alert($('.itemQuantity').val()); }); }); </script> How Can I do it with jquery(I thinking to use this and not create id for each element, but I have low knoledge in jquery). Thanks, Yosef <table id="items"> <tr> <th>item id</th> <th>item name</th> <th>item quantity</th> <th>item update</th> </tr> <tr> <td class="itemID"> 1 </td> <td class="itemName"> Ferari </td> <td > <input class="itemQuantity" type="text" size="4"/> </td> <td> <button class="updateButton" >update item</button> </td> </tr> <tr> <td class="itemID"> 2 </td> <td class="itemName"> Fiat </td> <td > <input class="itemQuantity" type="text" size="4"/> </td> <td> <button class="updateButton" >update item</button> </td> </tr> <tr> <td class="itemID"> 3 </td> <td class="itemName"> Hundai </td> <td > <input class="itemQuantity" type="text" size="4"/> </td> <td> <button class="updateButton" >update item</button> </td> </tr> </table>

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  • jQuery: How can select clicked element in table without define unique id for each element

    - by Yosef
    Hello, I have table (that generated by server) below. I want to get input element value class="itemQuantity" of clicked row. I write jQuery code but he missing "this" of clicked element. <script type="text/javascript"> $(document).ready(function() { $('.updateButton').click(function() { alert($('.itemQuantity').val()); }); }); </script> How can I do it with jQuery (I thinking to use this and not create id for each element, but I have low knowledge in jQuery). Thanks, Yosef <table id="items"> <tr> <th>item id</th> <th>item name</th> <th>item quantity</th> <th>item update</th> </tr> <tr> <td class="itemID"> 1 </td> <td class="itemName"> Ferari </td> <td > <input class="itemQuantity" type="text" size="4" /> </td> <td> <button class="updateButton">update item</button> </td> </tr> <tr> <td class="itemID"> 2 </td> <td class="itemName"> Fiat </td> <td > <input class="itemQuantity" type="text" size="4" /> </td> <td> <button class="updateButton">update item</button> </td> </tr> <tr> <td class="itemID"> 3 </td> <td class="itemName"> Hundai </td> <td > <input class="itemQuantity" type="text" size="4" /> </td> <td> <button class="updateButton">update item</button> </td> </tr> </table>

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  • How to define GPS module in Android?

    - by Osama Gamal
    I'm porting android to Devkit8000 which is a BeagleBoard clone. I have a GPS module connected on /dev/ttyS0. I could successfully get NMEA output when writing "cat /dev/ttyS0" in the terminal emulator. I want to know how to let android know that there is a GPS module on /dev/ttyS0 and it is outputting NMEA standard? To be able to use the android.location class with it! Is there something to edit in the android's source? adding driver for example, writing a code with android-ndk or what?

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  • Jquery UI: How to define different CSS styles for Tabs and Slider on the same page

    - by Kelvin
    Hello all, I have two elements on the same page that are using the same stylesheet: Jquery Tabs and Jquery Slider. I cannot redefine classes of slider since change of css will affect both elements. Tabs using these classes: ui-tabs ui-widget ui-widget-content ui-corner-all And these are used in Slider: ui-slider ui-slider-horizontal ui-widget ui-widget-content ui-corner-all How can I modify slider css without modifying one for tabs? Thanks

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  • Define a varbinary(max) column using sqlalchemy on MS SQL Server

    - by Mark Hall
    Hi, I'm querying an SQL Server database using SQLAlchemy and need to cast a column to varbinary(max). The thing I am struggling with is the "max" part. I can get the cast to work for any actual number (say varbinary(20)), but I cannot find how to get it to work for the "max" size of the varbinary column. Any pointers? Links? Solutions? Regards, Mark

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  • Define a regex, which matches one digit twice and all others once

    - by Amin
    As part of a larger regex I would like to match the following restrictions: The string has 11 digits All digits are numbers Within the first 10 digits one number [0-9] (and one only!) must be listed twice This means the following should match: 12345678914 12235879600 Whereas these should not: 12345678903 -> none of the numbers at digits 1 to 10 appears twice 14427823482 -> one number appears more than twice 72349121762 -> two numbers appear twice I have tried to use a lookahead, but all I'm managing is that the regex counts a certain digit, i.e.: (?!.*0\1{2}) That does not do what I need. Is my query even possible with regex?

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