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  • Exposing boost::scoped_ptr in boost::python

    - by Rupert Jones
    Hello, I am getting a compile error, saying that the copy constructor of the scoped_ptr is private with the following code snippet: class a {}; struct s { boost::scoped_ptr<a> p; }; BOOST_PYTHON_MODULE( module ) { class_<s>( "s" ); } This example works with a shared_ptr though. It would be nice, if anyone knows the answer. Thanks

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  • Lazy evaluation with ostream C++ operators

    - by SavinG
    I am looking for a portable way to implement lazy evaluation in C++ for logging class. Let's say that I have a simple logging function like void syslog(int priority, const char *format, ...); then in syslog() function we can do: if (priority < current_priority) return; so we never actually call the formatting function (sprintf). On the other hand, if we use logging stream like log << LOG_NOTICE << "test " << 123; all the formating is always executed, which may take a lot of time. Is there any possibility to actually use all the goodies of ostream (like custom << operator for classes, type safety, elegant syntax...) in a way that the formating is executed AFTER the logging level is checked ?

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  • Is there a full REPL for Erlang?

    - by Gabriel Cuvillier
    Is there a way to have a full interpreter in Erlang, not just a "shell". Since it is a dynamic language, not being able to define named functions in the interpreter is a little bit disappointing... I suspect that it is because compilation units (modules) must be explicitly compiled for their execution by the VM, but maybe a REPL acting as a dynamic/recompilable module exist?

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  • Drupal how to set session or cookie?

    - by Gobi
    Hi, i jus friend reference function so i pass the user id through url like below www.example.com?fid=22 i need to set this as a session or cookie which access to all modules in drupal 6. if i set session it return for tht particular module . set cookie is not workin at all. $user-new_property works only on particular page where set if i move to another page no new_property in $user variable object list . Thanxs in advance, Gobi

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  • doubt in sizeof implementation

    - by aks
    Below is the program to find the size of a structure without using sizeof operator: struct MyStruct { int i; int j; }; int main() { struct MyStruct *p=0; int size = ((char*)(p+1))-((char*)p); printf("\nSIZE : [%d]\nSIZE : [%d]\n", size); return 0; } My doubt is: Why is typecasting to char * required? If I don't use the char* pointer, the output is 1 - WHY?

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  • Why do all procedures have to be defined before the compiler sees them?

    - by incrediman
    For example, take a look at this code (from tspl4): (define proc1 (lambda (x y) (proc2 y x))) If I run this as my program in scheme... #!r6rs (import (rnrs)) (define proc1 (lambda (x y) (proc2 y x))) I get this error: expand: unbound identifier in module in: proc2 ...This code works fine though: #!r6rs (import (rnrs)) (define proc2 +) (define proc1 (lambda (x y) (proc2 y x))) (display (proc1 2 3)) ;output: 5

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  • How to create a subject helper method in Rspec2

    - by Hedgehog
    In rpsec 2.12 I expected this helper method definition to work: module X private def build_them(type) puts 'Catching the star' end end context 'public/private instance methods' do subject{ Class.new { extend(::X) } } def subject.build(type) puts "Throwing a star" build_them(type) end it{ should respond_to :build} end The actual result is a failed spec: expected #<Class:0x00000002ea5f90> to respond to :build I expected the example to pass Any suggestions on how to do this correctly?

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  • Is there an existing algorithm for this notation translation/conversion?

    - by John
    A system has a notation that would require writing an expression like (A+B)*C as #MUL(#ADD(A,B),C). Is there already an algorithm to do this kind of notation conversion so users can enter in a more conventional way? In other words an algorithm to convert from infix - my notation. First issue is I don't know an exact name for my notation... it's similar to reverse-polish but not quite. Every operator is encoded as a function taking arguments.

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  • Error log of make command in Linux

    - by dexkid
    I am compiling a kernel module and it has many compilation errors in it. After running "make", the errors thrown out are too many to fit in the screen. Scrolling up doesn't reach the first error. I tried capturing the errors by doing make &2 log which didn't work (log file was empty and the error messages were still dumped on screen). Can someone please tell me how to go about logging all the messages generated during compilation/make into a logfile?

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  • Import Excel to sqlserver 2005 using Sqlbulkupload

    - by Jayesh
    Hi all, I want to upload excel file using SqlBulkCopy into sql server 2005 table. My excel file size is 43MB. When i am uploading this file it will display error message that "The request filtering module is configured to deny a request that exceeds the request content length.". My web.config file setting is <httpRuntime executionTimeout="12000" maxRequestLength="2097151" useFullyQualifiedRedirectUrl="false" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100"/> Thanks in advance.

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  • Is it possible to disable Symfony framework support in NetBeans 6.8?

    - by Throlkim
    Put simply: it causes a massive memory leak within an hour if I work on a Symfony project, and I don't use any of the features that it provides. I've looked through all of the menus and can't seem to see an option to disable support for it. Has anyone attempted or managed to remove this module from the IDE? I quite like NetBeans, but on the rare occasions when I need to work with a Symfony project it's causing me quite a headache.

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  • How to bind a double precision using psycopg2

    - by user337636
    I'm trying to bind a float to a postgresql double precision using psycopg2. ele = 1.0/3.0 dic = {'name': 'test', 'ele': ele} sql = '''insert into waypoints (name, elevation) values (%(name)s, %(ele)s)''' cur = db.cursor() cur.execute(sql, dic) db.commit() sql = """select elevation from waypoints where name = 'test'""" cur.execute(sql_out) ele_out = cur.fetchone()[0] ele_out 0.33333333333300003 ele 0.33333333333333331 Obviously I don't need the precision, but I would like to be able to simply compare the values. I could use the struct module and save it as a string, but thought there should be a better way. Thanks

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  • I need to do a BASICE For Loop algorithm for a java Pyramid

    - by user1665119
    Question 2. USE THE FOR LOOP. Design and write an algorithm that will read a single positive number from the keyboard and will then print a pyramid out on the screen. The pyramid will need to be of a height equal in lines to the number inputted by the operator. Your program is not to test for negative numbers, nor is it to cater for them. For your test, use the number 7. If you would like to take the problem further, try 18 and watch what happens. Example input: 4 Example output: 1 121 12321 1234321

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  • How to process audio in real time?

    - by user1756648
    I am giving some audio input through microphone. I recorded it in Audacity, it looks something like as shown below. I want to process this audio in real time. I mainly want to do this. 1) see real time audio amplitude vs time graph 2) perform some actions based on some thing (like if a specific type of hike is seen in audio, then do something, else do something else) Is there any python module or C library that can allow me to do this ?

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  • Problem installing MySQLdb on windows - Can't find python

    - by aldux
    I'm trying to install the module mySQLdb on a windows vista 64 (amd) machine. I've installed python on a different folder other than suggested by Python installer. When I try to install the .exe mySQLdb installer, it can't find python 2.5 and it halts the installation. Is there anyway to supply the installer with the correct python location (even thou the registry and path are right)?

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  • Drupal: Renumbering node ids

    - by AK
    Having spent some time migrating old data into a new drupal site, my first node id is already into the 4 digit territory. Has anyone had any experience in this position of renumbering node ids starting from #1? Maybe using direct queries on the database, or a module that traverses and renumbers all the nodes? Of course, nodereferences have to be preserved... are there any other potential hangups if I try to script this?

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  • Binning into timeslots - Is there a better way than using list comp?

    - by flyingcrab
    I have a dataset of events (tweets to be specific) that I am trying to bin / discretize. The following code seems to work fine so far (assuming 100 bins): HOUR = timedelta(hours=1) start = datetime.datetime(2009,01,01) z = [dt + x*HOUR for x in xrange(1, 100)] But then, I came across this fateful line at python docs 'This makes possible an idiom for clustering a data series into n-length groups using zip(*[iter(s)]*n)'. The zip idiom does indeed work - but I can't understand how (what is the * operator for instance?). How could I use to make my code prettier? I'm guessing this means I should make a generator / iterable for time that yields the time in graduations of an HOUR?

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  • different explanation

    - by Delirium tremens
    The following code echoes 5, not 10: $global_obj = null; class my_class { var $value; function my_class() { global $global_obj; $global_obj = &$this; } } $a = new my_class; $a->my_value = 5; $global_obj->my_value = 10; echo $a->my_value; "Upon first examination, it would seem that the constructor of my_class stores a reference to itself inside the $global_obj variable. Therefore, one would expect that, when we later change the value of $global_obj-my_value to 10, the corresponding value in $a would change as well. Unfortunately, the new operator does not return a reference, but a copy of the newly created object." Please, give me a different explanation.

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  • Cache Web Application files locally (for responsiveness)

    - by jiewmeng
    is there a way i can cache all required application files on the local computer for speed without any disruption (at least those that can be run locally)? i want it to be able to start even without connection right from the start, isit possible? is Google Gears what i shld use? i heard theres a HTML5 feature/module for it?

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  • SQL only row mapping record fetching

    - by Prasanna
    I have a customer call detail table in which call details of all customer stored. I have to find out the distinct aparty (means our customer ) who only calls our customers (means bparty also be our numbers) . There is no other domestic call , International calls made by A party (our customer) in this case. could you people please help me to find the same data. FILE INPUT oF SAMPLE CDR TABLE ROW NAME VALUES ANUMBER :-any mobile number(Domestic+International); for our customer it must like 70,070,0070,9370) BNUMBER :-any mobile number(Domestic+International); for our customer it must like 70,070,0070,9370 CALLTRANSACTION :-eg: 91,92,93 etc CALLTRANSACTIONTYPEC :-eg: MOC,MTC FILENAME :-MCS_01 etc TIME:- any time value Required Output DISTINCT ANUMBER :-for our customer it mobile number must start with 70 or 070 or 0070 or 9370 BNUMBER :- for our customer it mobile number must start with 70 or 070 or 0070 or 9370 means our customer only calls to our network customer ( No other doestic call or international calls made by our operator)

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  • How do I empty Drupal Cache (without Devel)

    - by alexanderpas
    Okay... Seems i can't find it with google... so here you go SO ;) How do i empty the drupal caches: without the Devel module without running some PHP Statement in a new node etc. without going into the database itself Effectively, how do you instruct a luser to clear his caches

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  • Calling this[int index] via reflection

    - by tkutter
    I try to implement a reflection-based late-bound library to Microsoft Office. The properties and methods of the Offce COM objects are called the following way: Type type = Type.GetTypeFromProgID("Word.Application"); object comObject = Activator.CreateInstance(type); type.InvokeMember(<METHOD NAME>, <BINDING FLAGS>, null, comObject, new object[] { <PARAMS>}); InvokeMember is the only possible way because Type.GetMethod / GetProperty works improperly with the COM objects. Methods and properties can be called using InvokeMember but now I have to solve the following problem: Method in the office-interop wrapper: Excel.Workbooks wb = excel.Workbooks; Excel.Workbook firstWb = wb[0]; respectively foreach(Excel.Workbook w in excel.Workbooks) // doSmth. How can I call the this[int index] operator of Excel.Workbooks via reflection?

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