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• Can 'iterator' type just subclass 'const_iterator'?

  - by doublep

  After another question about iterators I'm having some doubts about custom containers. In my container, iterator is a subclass of const_iterator, so that I get conversion from non-const to const "for free". But is this allowed or are there any drawbacks or non-working scenarios for such a setup?

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• Is there a Pattern in Scala that add a method to an Array object?

  - by Fred Haslam

  Is there a Pattern in Scala that can add a method to an Array object? I am thinking of the implicit conversion of Int to RichInt. But that can't be done as Array is a final class.

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• Limit a double to two decimal places

  - by Jacob

  How do I achieve the following conversion from double to a string: 1.4324 => "1.43" 9.4000 => "9.4" 43.000 => "43" ie I want to round to to decimal places but dont want any trailing zeros, ie i dont want 9.4 => "9.40" (wrong) 43.000 => "43.00" (wrong) So this code which I have now doesn't work as it displays excess twos: [NSString stringWithFormat: @"%.2f", total]

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• [VB.Net] Typecasting generic parameters.

  - by CFP

  Hello world! Using the following code: Function GetSetting(Of T)(ByVal SettingName As String, ByRef DefaultVal As T) As T Return If(Configuration.ContainsKey(SettingName), CType(Configuration(SettingName), T), DefaultVal) End Function Yields the following error: Value of type 'String' cannot be converted to 'T'. Any way I could specify that in all cases, the conversion will indeed be possible (I'm basically getting integers, booleans, doubles and strings). Thanks!

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• How to implement speech recognition and text-to-speech in C++?

  - by ashishjsoni

  I want to know about various techniques to do speech recognition and text to speech conversion. Also please let me know about any resources like links, tutorials ,ebooks etc. on it. Which is the most efficient technique to achieve it ?

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• ado.net data entity problem

  - by ognjenb

  I have this error Cannot implicitly convert type 'System.Linq.IQueryable' to 'Mvc.Models.engineer'. An explicit conversion exists (are you missing a cast?) after write this code engineer Ing = new engineer(); Ing = from j in testPersons.ibekoengineer select j.Name; What is wrong?

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• How do I use Perl's chdir operator?

  - by T. Gruhn

  In ksh, I'd use cd /usr/src/sys How should I write it in Perl? A conversion such as cd /usr/src/sys ---> chdir '/usr/src/sys' Maybe the following would be better: execute "chdir '/usr/src/sys' "

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• Problem with C function of type char pointer, can someone explain?

  - by JJ

  Find the errors from following C function : char* f(int i) { int i; char buffer[20]; switch ( i ) { 1: strcpy( buffer, "string1"); 2: strcpy( buffer, "string2"); 3: strcpy( buffer, "string3"); default: strcpy(buffer, "defaultstring"); } return buffer; } this is c funtion not C++, I think it has to do with type conversion my compiler give warning that declaration of int i shadows a parameter.

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• Linux Kernel - Integer to ASCII

  - by DRX-Z

  I need to convert an integer to it's ASCII representation from within the Linux Kernel. How can I do this? I can't find any built-in conversion methods. Are there any already in the kernel or do I need to add my own?

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• How can I construct or return the underlying deque from a stack?

  - by BeeBand

  I want to be able to convert a std::stack< to a std::deque<. Is there a straightforward conversion?

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• Dictionary to Json object, "Expected expression"

  - by MrW

  I'm trying to convert a dictionery into a json object, so that I can work with it in my front end. sortFields = <%= SchrodersHtmlHelper.ToJson(ViewData["SortInfo"])%>; However, I keep on getting "Expected expression" for this all the time and I'm clueless why. Could anyone explain to me what I'm doing wrong? Edit: The conversion works fine, but I still get this issue in the front end, causing the browser to complain about it.

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• How to censor IP addresses in a file with Python?

  - by Julio

  Hello everyone. I have a log file containing some Whois entries with relative IP addresses which I want to censor like: 81.190.123.123 in 81.190.xxx.xxx. Is there a way to make such a conversion and rewrite the file contents without modifying the rest? Thank you for the help!

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• Creation of an object in C++

  - by cambr

  Isn't A a = new A(); // A is a class name supposed to work in C++? I am getting: conversion from 'A*' to non-scalar type 'A' requested Whats wrong with that line of code?

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• Security concerns for a multi-lingual web application.

  - by The Rook

  I am converting a PHP MySQL web application written for English language into a Multi-Language site. Do you know any vulnerabilities that affect web applications in another language? Or perhaps vulnerabilities that could be introduced in the conversion of code base to support multiple languages. (If you know any vulnerabilities of this type in another programming language I'll give you a +1)

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• Is there ever a good reason to store time not in UTC?

  - by landon9720

  I am wondering if there are any good reasons to ever store time information in anything other that UTC (GMT)? I believe that this is a solid rule for all software engineering. The conversion to local time is merely a translation that happens at the UI layer for display purposes. I have also seen cases where the translatation is needed in order to implement an algorithm correctly (for handling midnight date changes, etc.).

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• Advice on translating code from very unrelated languages (in this case Scheme to Python)?

  - by Michael

  Reasoning: I'm trying to convert a large library from Scheme to Python Are there any good strategies for doing this kind of conversion? Specifically cross-paradigm in this case since Python is more OO and Scheme is Functional. Totally subjective so I'm making it community wiki

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• [C++ / NCURSES] Can't convert from 'int' to 'int *'

  - by flarn2006

  So I have these lines of code: int maxY, maxX; getmaxyx(stdscr, &maxY, &maxX); It gives me the following error: error C2440: '=' : cannot convert from 'int' to 'int *' Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast twice for each time I use it. I'm not even using the = operator! The curses.h file is included. What am I doing wrong?

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• PHP: How do I convert a server timestamp to the user's timezone?

  - by KeyStroke

  Hi, I'm currently storing times using the 'time()' function in the database. However, it's using the timezone of the server, and I'd like for each user to see the time according to their timezone (set in their profile). How do I do the timestamp conversion? (and I mean from timestamp to timestamp, not to readable time) Your help is appreciated

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• Any hints for those that want to upgrade from Delphi 7 (and down) to Delphi 2010?

  - by Altar

  Hi. After update 4 and 5 I am interested to re-evaluate Delphi 2010. This time I intend to port some of my code (small scale) to see how difficult is to do it at large scale. The main issue seems to be the ascii to unicode conversion. Any tips or resources about this that you have found useful? Many thanks.

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• How to convert a "dd/mm/yyyy" string to datetime in MSSQL ?

  - by Sim

  I tried this SELECT convert(datetime, '23/07/2009', 111) but got this error The conversion of a varchar data type to a datetime data type resulted in an out-of-range value. However SELECT convert(datetime, '07/23/2009', 111) is OK though How to fix the 1st one ? Thanks

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• SQL 2008 CASE statement aggravation...

  - by Brad

  Why does this fail: DECLARE @DATE VARCHAR(50) = 'dasf' SELECT CASE WHEN ISDATE(@DATE) = 1 THEN CONVERT(date,@DATE) ELSE @DATE END Msg 241, Level 16, State 1, Line 2 Conversion failed when converting date and/or time from character string. Why is it trying to convert dasf to date when it clearly causes ISDATE(@DATE) = 1 to evaluate to false... If I do: SELECT ISDATE(@DATE) The return value is 0.

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• Worst aspect of Python for a newbie

  - by schickb

  I'm wondering specifically what experienced programmers thought when they started developing in Python. I'm sure the answer depends on your background, but my own personal answer is the conversion of basically anything in the language to a True/False value in boolean contexts. Resulting in "oddities" like: if x: not meaning the same thing as: if x == True: I understand why, but it bugs me, and I certainly had to think about it a bit when I first ran into it.

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• C++: combine const with template arguments

  - by awn

  The following example is working when I manualy replace T wirh char *, but why is not working as it is: template <typename T> class A{ public: A(const T _t) { } }; int main(){ const char * c = "asdf"; A<char *> a(c); } When compiling with gcc, I get this error: test.cpp: In function 'int main()': test.cpp:10: error: invalid conversion from 'const char*' to 'char*' test.cpp:10: error: initializing argument 1 of 'A<T>::A(T) [with T = char*]'

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• C#, why does Convert.ToBoolean("0") fail?

  - by JL

  I know that trying to convert string "0" to boolean will fail, I also know how to fix this, thanks to Jon Skeets answers on other questions. What I would like to know is WHY does C# not recognise "0" as a valid input for a boolean conversion, surely you could look at it like 0 = false, 1 = true, or even -1 = false and 0 = true, anyways, my logic tells me that it could be a valid input, so is there a very good reason why its not? My bet is old vb6 would be able to recognize the string input "0" as valid.

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• SQL Server varchar to datetime

  - by Dezigo

  I have a field varchar(14) = 20090226115644 I need convert it to - 2009-02-26 11:56:44 (datetime format) My idea. use cast and convert.. but I always have errors. Conversion failed when converting datetime from character string. I made this, but don`t like it.. SELECT SUBSTRING(move,1,4) + '-' + SUBSTRING(move,5,2) + '-' + SUBSTRING(move,7,2) + ' ' + SUBSTRING(move,9,2) + ':' + SUBSTRING(move,11,2) + ':'+SUBSTRING(move,13,2) as new -- FROM [Test].[dbo].[container_events] where move IS not null Result :2009-02-26 11:56:44

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