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  • Throw exception from initializer list

    - by aaa
    hello. what is the best way to throw exception from initializer list? for example: class C { T0 t0; // can be either valid or invalid, but does not throw directly T1 t1; // heavy object, do not construct if t0 is invalid, by throwing before C(int n) : t0(n), // throw exception if t0(n) is not valid t1() {} }; I thought maybe making wrapper, e.g. t0(throw_if_invalid(n)). What is the practice to handle such cases? Thanks

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  • C++, throw exception from initializer list

    - by aaa
    hello. what is the best way to throw exception from initializer list? for example: class C { T0 t0; // can be either valid or invalid, but does not throw directly T1 t1; // heavy object, do not construct if t0 is invalid, by throwing before C(int n) : t0(n), // throw exception if t0(n) is not valid t1() {} }; I thought maybe making wrapper, e.g. t0(throw_if_invalid(n)). What is the practice to handle such cases? Thanks

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  • Enums With Default Throw Clause?

    - by Tom Tresansky
    I noticed the following in the Java Language spec in the section on enumerations here: link switch(this) { case PLUS: return x + y; case MINUS: return x - y; case TIMES: return x * y; case DIVIDE: return x / y; } throw new AssertionError("Unknown op: " + this); However, looking at the switch statement definition section, I didn't notice this particular syntax (the associated throw statement) anywhere. Can I use this sort of "default case is throw an exception" syntactic sugar outside of enum definitions? Does it have any special name? Is this considered a good/bad practice for short-cutting this behavior of "anything not in the list throws an exception"?

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  • C#: Exception to throw when a certain type was expected

    - by cbp
    I know this sort of code is not best practice, but nevertheless in certain situations I find it is a simpler solution: if (obj.Foo is Xxxx) { // Do something } else if (obj.Foo is Yyyy) { // Do something } else { throw new Exception("Type " + obj.Foo.GetType() + " is not handled."); } Anyone know if there is a built-in exception I can throw in this case?

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  • When to throw exceptions?

    - by FRKT
    Exceptions are wonderful things, but I sometimes worry that I throw too many. Consider this example: Class User { public function User(user){ // Query database for user data if(!user) throw new ExistenceException('User not found'); } } I'd argue that it makes as much sense to simply return false (or set all user data to false in this case), rather than throwing an exception. Which do you prefer?

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  • What happens when I throw an exception?

    - by helloWorld
    I have some technical questions. In this function: string report() const { if(list.begin() == list.end()){ throw "not good"; } //do something } If I throw the exception what is going on with the program? Will my function terminate or will it run further? If it terminates, what value will it return?

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  • How to throw meaningful data in exceptions ?

    - by ZeroCool
    I would like to throw exceptions with meaningful explanation ! I thought of using variable arguments worked fine but lately I figured out it's impossible to extend the class in order to implement other exception types. So I figured out using an std::ostreamstring as a an internal buffer to deal with formatting ... but doesn't compile! I guess it has something to deal with copy constructors. Anyhow here is my piece of code: class Exception: public std::exception { public: Exception(const char *fmt, ...); Exception(const char *fname, const char *funcname, int line, const char *fmt, ...); //std::ostringstream &Get() { return os_ ; } ~Exception() throw(); virtual const char *what() const throw(); protected: char err_msg_[ERRBUFSIZ]; //std::ostringstream os_; }; The variable argumens constructor can't be inherited from! this is why I thought of std::ostringstream! Any advice on how to implement such approach ?

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  • C# Throw Exception on use Assert?

    - by guazz
    I have a system where the employeeId must alway exist unless there is some underlying problem. The way I see it, is that I have two choices to check this code: 1: public void GetEmployee(Employee employee) { bool exists = EmployeeRepository.VerifyIdExists(Employee.Id); if (!exists) { throw new Exception("Id does not exist); } } or 2: public void GetEmployee(Employee employee) { EmployeeRepository.AssertIfNotFound(Employee.Id); } Is option #2 acceptable in the C# language? I like it because it's tidy in that i don't like looking at "throw new Exception("bla bla bla") type messages outsite the class scope.

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  • Is there any reason to throw a DivideByZeroException?

    - by Atomiton
    Are there any cases when it's a good idea to throw errors that can be avoided? I'm thinking specifically of the DivideByZeroException and NullReferenceException For example: double numerator = 10; double denominator = getDenominatorFromUser(); if( denominator == 0 ){ throw new DivideByZeroException("You can't divide by Zero!"); } Are there any reasons for throwing an error like this? NOTE: I'm not talking about catching these errors, but specifically in knowing if there are ever good reasons for throwing them.

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  • cflock do not throw timeout for same url called in same browser

    - by Pritesh Patel
    I am trying lock block on page test.cfm and below is code written on page. <cfscript> writeOutput("Before lock at #now()#"); lock name="threadlock" timeout="3" type="exclusive" { writeOutput("<br/>started at #now()#"); thread action="sleep" duration="10000"; writeOutput("<br/>ended at #now()#"); } writeOutput("<br/>After lock at #now()#"); </cfscript> assuming my url for page is http://localhost.local/test.cfm and running it on browser in two different tabs. I was expecting one of the url will throw timeout error after 3 second since another url lock it atleast for 10 seconds due to thread sleep. Surprisingly I do not get any timeout error rather second page call run after 10 seconds as first call finish execution. But I am appending some url parameter (e.g. http://localhost.local/test.cfm?q=1) will throw error. Also I am calling same url in different browser then one of the call will throw timeout issue. Is lock based on session and url? Update Here is output for two different cases: Case 1: TAB1 Url: http://localhost.local/test/test.cfm Before lock at {ts '2013-10-18 09:21:35'} started at {ts '2013-10-18 09:21:35'} ended at {ts '2013-10-18 09:21:45'} After lock at {ts '2013-10-18 09:21:45'} TAB2 Url: http://localhost.local/test/test.cfm Before lock at {ts '2013-10-18 09:21:45'} started at {ts '2013-10-18 09:21:45'} ended at {ts '2013-10-18 09:21:55'} After lock at {ts '2013-10-18 09:21:55'} Case 2: TAB1 Url: http://localhost.local/test/test.cfm Before lock at {ts '2013-10-18 09:27:18'} started at {ts '2013-10-18 09:27:18'} ended at {ts '2013-10-18 09:27:28'} After lock at {ts '2013-10-18 09:27:28'} TAB2 Url: http://localhost.local/test/test.cfm? (Added ? at the end) Before lock at {ts '2013-10-18 09:27:20'} A timeout occurred while attempting to lock threadlock. The error occurred in C:/inetpub/wwwroot/test/test.cfm: line 13 11 : 12 : <cfoutput>Before lock at #now()#</cfoutput> 13 : <cflock name="threadlock" timeout="3" type="exclusive"> 14 : <cfoutput><br/>started at #now()#</cfoutput> 15 : <cfthread action="sleep" duration="10000"/> ... Result for case 2 as expected. For case 1, strange thing I just noticed is tab 2 output "Before lock at {ts '2013-10-18 09:21:45'} indicates that whole request start after 10 seconds (means after the complete execution of first tab) when I have fired it in second URL just after 2 seconds of first tabs.

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  • Java Custom exception throw behaves differently between different Projects

    - by Pablo
    I am attempting to call the following in my code: public void checkParticleLightRestriction(Particle parent) throws LightException { if ( parent == null ) { throw new LightException("quantum-particle-restrict.23", this); } In one Project the exception is thrown and the effect is similar to calling "return" whereby I am returned back to the point immediately succeeding where this method was called. However in another Project I get thrown completed out of the current package and to a point way prior to the point preceeding this method. It likes instead of being kicked out of a bar I am being deported all the way out of the country. My option are the wrap the throw in a try / catch but I am wondering why this difference in behaviour beween the 2 projects ?

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  • mod_rewrite settings causes server to throw HTTP 500 errors instead of 404

    - by FractalizeR
    Hello. I have a server with VBulletin forum (working under Apache 2.2, CentOS). The default settings for it in .htaccess are as follows: RewriteEngine on RewriteCond %{HTTP_HOST} ^gsmforum\.ru RewriteRule (.*) http://www.gsmforum.ru/$1 [R=301,L] # If you are having problems or are using VirtualDocumentRoot, uncomment this line and set it to your vBulletin directory. RewriteBase / RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] # Forum RewriteRule ^threads/.* showthread.php [QSA] RewriteRule ^forums/.* forumdisplay.php [QSA] RewriteRule ^members/.* member.php [QSA] RewriteRule ^blogs/.* blog.php [QSA] ReWriteRule ^entries/.* entry.php [QSA] RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] # MVC RewriteRule ^(?:(.*?)(?:/|$))(.*|$)$ $1.php?r=$2 [QSA] If I try to access any non-existent URL on forum like www.example.com/ajdsjaskasajs, server throws HTTP 500 error. Apache log says: [Sun Apr 25 17:24:32 2010] [error] [client 82.211.152.12] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace., referer: http://www.gsmforum.ru/forumdisplay.php?424-%CD%EE%E2%EE%F1%F2%E8-%EF%F0%EE%E3%F0%E0%EC%EC%E0%F2%EE%F0%EE%E2 If I switch LogLevel to Debug I get something like this: [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php.php.php.php.php.php.php.php.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php.php.php.php.php.php.php.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php.php.php.php.php.php.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php.php.php.php.php.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php.php.php.php.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php.php.php.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php.php.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt.php [Sun Apr 25 17:30:46 2010] [debug] core.c(3059): [client 95.25.70.85] redirected from r->uri = /robots.txt [root@server2 logs]# tail httpd_error.log [Sun Apr 25 17:31:27 2010] [debug] core.c(3059): [client 217.118.79.27] redirected from r->uri = /clientscript.php.php.php.php.php.php.php, referer: http://74.125.77.132/search?q=cache:bGPJ8XkSvlMJ:www.gsmforum.ru/showthread.php%3Ft%3D62479+%D0%A3%D0%BC%D0%B5%D0%BD%D1%8C%D1%88%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D0%B8%D0%BD%D0%B3%D0%B0+3G+%D0%BC%D0%BE%D0%B4%D0%B5%D0%BC&cd=3&hl=ru&ct=clnk&gl=ru [Sun Apr 25 17:31:27 2010] [debug] core.c(3059): [client 217.118.79.27] redirected from r->uri = /clientscript.php.php.php.php.php.php, referer: http://74.125.77.132/search?q=cache:bGPJ8XkSvlMJ:www.gsmforum.ru/showthread.php%3Ft%3D62479+%D0%A3%D0%BC%D0%B5%D0%BD%D1%8C%D1%88%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D0%B8%D0%BD%D0%B3%D0%B0+3G+%D0%BC%D0%BE%D0%B4%D0%B5%D0%BC&cd=3&hl=ru&ct=clnk&gl=ru [Sun Apr 25 17:31:27 2010] [debug] core.c(3059): [client 217.118.79.27] redirected from r->uri = /clientscript.php.php.php.php.php, referer: http://74.125.77.132/search?q=cache:bGPJ8XkSvlMJ:www.gsmforum.ru/showthread.php%3Ft%3D62479+%D0%A3%D0%BC%D0%B5%D0%BD%D1%8C%D1%88%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D0%B8%D0%BD%D0%B3%D0%B0+3G+%D0%BC%D0%BE%D0%B4%D0%B5%D0%BC&cd=3&hl=ru&ct=clnk&gl=ru [Sun Apr 25 17:31:27 2010] [debug] core.c(3059): [client 217.118.79.27] redirected from r->uri = /clientscript.php.php.php.php, referer: http://74.125.77.132/search?q=cache:bGPJ8XkSvlMJ:www.gsmforum.ru/showthread.php%3Ft%3D62479+%D0%A3%D0%BC%D0%B5%D0%BD%D1%8C%D1%88%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D0%B8%D0%BD%D0%B3%D0%B0+3G+%D0%BC%D0%BE%D0%B4%D0%B5%D0%BC&cd=3&hl=ru&ct=clnk&gl=ru [Sun Apr 25 17:31:27 2010] [debug] core.c(3059): [client 217.118.79.27] redirected from r->uri = /clientscript.php.php.php, referer: http://74.125.77.132/search?q=cache:bGPJ8XkSvlMJ:www.gsmforum.ru/showthread.php%3Ft%3D62479+%D0%A3%D0%BC%D0%B5%D0%BD%D1%8C%D1%88%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D0%B8%D0%BD%D0%B3%D0%B0+3G+%D0%BC%D0%BE%D0%B4%D0%B5%D0%BC&cd=3&hl=ru&ct=clnk&gl=ru [Sun Apr 25 17:31:27 2010] [debug] core.c(3059): [client 217.118.79.27] redirected from r->uri = /clientscript.php.php, referer: http://74.125.77.132/search?q=cache:bGPJ8XkSvlMJ:www.gsmforum.ru/showthread.php%3Ft%3D62479+%D0%A3%D0%BC%D0%B5%D0%BD%D1%8C%D1%88%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D0%B8%D0%BD%D0%B3%D0%B0+3G+%D0%BC%D0%BE%D0%B4%D0%B5%D0%BC&cd=3&hl=ru&ct=clnk&gl=ru [Sun Apr 25 17:31:27 2010] [debug] core.c(3059): [client 217.118.79.27] redirected from r->uri = /clientscript.php, referer: http://74.125.77.132/search?q=cache:bGPJ8XkSvlMJ:www.gsmforum.ru/showthread.php%3Ft%3D62479+%D0%A3%D0%BC%D0%B5%D0%BD%D1%8C%D1%88%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D0%B8%D0%BD%D0%B3%D0%B0+3G+%D0%BC%D0%BE%D0%B4%D0%B5%D0%BC&cd=3&hl=ru&ct=clnk&gl=ru [Sun Apr 25 17:31:27 2010] [debug] core.c(3059): [client 217.118.79.27] redirected from r->uri = /clientscript/vbulletin_css/style-d95b06dc-00001.css, referer: http://74.125.77.132/search?q=cache:bGPJ8XkSvlMJ:www.gsmforum.ru/showthread.php%3Ft%3D62479+%D0%A3%D0%BC%D0%B5%D0%BD%D1%8C%D1%88%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BF%D0%B8%D0%BD%D0%B3%D0%B0+3G+%D0%BC%D0%BE%D0%B4%D0%B5%D0%BC&cd=3&hl=ru&ct=clnk&gl=ru If I remove or comment the last (#MVC) line from .htaccess all is fine. Can you advise me what is the problem with mod_rewrite settings? Why does the last line cause infinite recursion?

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  • Rest client throw timeout exception

    - by shandu
    Hi, I have create REST client in C# using example on this page: http://msdn.microsoft.com/en-us/library/aa395208(v=vs.90).aspx. Server is built in PHP. When I send request to some urls I have this exception: The request channel timed out while waiting for a reply after 00:00:59.9531250. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout. But, sometimes, when I debug code, I get response. How to solve this?

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  • Rest client throw timeout exception

    - by shandu
    Hi, I have create REST client in C# using example on this page: http://msdn.microsoft.com/en-us/library/aa395208(v=vs.90).aspx. Server is built in PHP. When I send request to some urls I have this exception: The request channel timed out while waiting for a reply after 00:00:59.9531250. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout. But, sometimes, when I debug code, I get response. How to solve this?

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  • How to throw a 404 error from htaccess?

    - by John Isaacks
    Everything I find seems to be about created a custom 404 page. That is not what I am trying to do. If I want to block access to a page I can do this in htaccess: RewriteRule pattern - [F] However, "Forbidden" hints that the page does exists. I want the page to appear to not even exist. So I would like to give a 404 error instead of a 403. Then have it render whatever 404 page would render if the resource really wasn't there. How can I do that?

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  • Is `catch(...) { throw; }` a bad practice?

    - by ereOn
    While I agree that catching ... without rethrowing is indeed wrong, I however believe that using constructs like this: try { // Stuff } catch (...) { // Some cleanup throw; } Is acceptable in cases where RAII is not applicable. (Please, don't ask... not everybody in my company likes object-oriented programming and RAII is often seen as "useless school stuff"...) My coworkers says that you should always know what exceptions are to be thrown and that you can always use constructs like: try { // Stuff } catch (exception_type1&) { // Some cleanup throw; } catch (exception_type2&) { // Some cleanup throw; } catch (exception_type3&) { // Some cleanup throw; } Is there a well admited good practice regarding these situations?

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  • C++ - Where to throw exception?

    - by HardCoder1986
    Hello! I have some kind of an ideological question, so: Suppose I have some templated function template <typename Stream> void Foo(Stream& stream, Object& object) { ... } which does something with this object and the stream (for example, serializes that object to the stream or something like that). Let's say I also add some plain wrappers like (and let's say the number of these wrappers equals 2 or 3): void FooToFile(const std::string& filename, Object& object) { std::ifstream stream(filename.c_str()); Foo(stream, object); } So, my question is: Where in this case (ideologically) should I throw the exception if my stream is bad? Should I do this in each wrapper or just move that check to my Foo, so that it's body would look like if (!foo.good()) throw (something); // Perform ordinary actions I understand that this may be not the most important part of coding and these solutions are actually equal, but I just wan't to know "the proper" way to implement this. Thank you.

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  • How to throw an HTTP error with mod_python

    - by Zxaos
    I have a setup where I'm serving simple python pages using the mod_python publisher. At some points I'd like to have the python function raise a standard apache error - for example throwing a 500 error if a required file is missing. How can I throw an apache error from within a mod_python script?

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