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  • is there a proper way to handle multiple errors/exceptions?

    - by toPeerOrNotToPeer
    in OO programming, is there some conceptual pattern, ideas, about handling multiple errors? for example, i have a method that performs some checks and should return an error message for each error found ['name is too short', 'name contains invalid unicode sequences', 'name is too long'] now, should i use an array of exceptions (not thrown exceptions)? or something like this is better: class MyExceptionList extends Exception{ public Void addException(Exception e){} public Array getExceptions(){} } any theory behind this argument will be appreciated! (this isn't a request about a specific programming language, but a pure theoretical one) thank you in advance

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  • C++: Trouble with tr1::bind (C2065)

    - by Rosarch
    I'm getting a compiler error with bind: using namespace std; bool odp(int arg1, int arg2); // ... find_if(vec.begin(), vec.end(), tr1::bind(odp, iValue, _1)); // C2065 My goal is to curry odp(), so its first argument is iValue, and apply that function in find_if. The error: C2065: '_1' : undeclared identifier. What am I doing wrong?

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  • Bash, no-arguments warning, and case decisions

    - by Werner
    Hi, I am learning bash. I would like to do a simple script that, when not arguments given, shows some message. And when I give numers as argument,s depending on the value, it does one thing or another. I would also like to know suggestions for the best online manuals for beginners in bash Thanks

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  • 'Invalid conversion from some_type** to const some_type**'

    - by petersohn
    I've got a function that requires const some_type** as an argument (some_type is a struct, and the function needs a pointer to an array of this type). I declared a local variable of type some_type*, and initialized it. Then I call the function as f(&some_array), and the compiler (gcc) says: error: invalid conversion from ‘some_type**’ to ‘const some_type**’ What's the problem here? Why can't I convert a variable to const?

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  • Hook perm for more than one content type

    - by Andrew
    Drupal 6.x I have this module that manages four different content types. For that matter, how do I define permission for each content within the same module? Is that even possible? I can't figure out how to define permission for each content type cuz hook_perm has to be named with module name and it doesn't have any argument(like hook_access $node) to return permission base on content type. Any help would be highly appreciated.

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  • Writing a file shredder in python or ruby?

    - by pmilb21
    In the effort to learn python and/or ruby, I was wondering how a file shredder would be implemented? I would like it to take in a file as an argument and then employ an algorithm to make that file unrecoverable. Would possibly add the support for multiple files or even whole directories later.

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  • Sending Data as Instances using Python Sockets

    - by Alice
    I'm working on the networking part of a 2 player game (similar to tetris), and I'm trying to pass the game grid from client to server and vice versa. However, when I tried using send(grid) I get a TypeError: send() argument 1 must be string or read-only buffer, not instance. Is there anyway to circumvent this, or do I have to convert my grid instance into a string and then interpret it from the other side? Thanks in advance!

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  • Windows Explorer Context Menu Integration, get file that was right clicked on

    - by racxen
    I've already figured out how to add a menu item to the right click context menu of the windows explorer using the registry. I currently have it set to launch my application when my menu item is clicked. However, I want to know if there is a way to know what file is was right clicked on. I thought it would have been sent as a command line argument to the launched program, but it's not. Any ideas?

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  • How can I have a newline in a string in sh?

    - by juannavarroperez
    This STR="Hello\nWorld" echo $STR produces as output Hello\nWorld instead of Hello World What should I do to have a newline in a string? I'm aware of echo -e, but I'm no sending the string to echo, the string will be used as an argument by another command that doesn't know how to interpret \n as a newline.

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  • Iterating through struct fieldnames in MATLAB.

    - by Noio
    My question is easily summarized as: "Why does the following not work?" teststruct = struct('a',3,'b',5,'c',9) fields = fieldnames(teststruct) for i=1:numel(fns) fns(i) teststruct.(fns(i)) end output: ans = 'a' ??? Argument to dynamic structure reference must evaluate to a valid field name. Especially since teststruct.('a') does work. And fns(i) prints out ans = 'a'. I can't get my head around it.

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  • Check directory for files, retrieve first file

    - by Lowgain
    I'm writing a small ruby daemon that I am hoping will do the following: Check if a specific directory has files (in this case, .yml files) If so, take the first file (numerically sorted preferrably), and parse into a hash Do a 'yield', with this hash as the argument What I have right now is like: loop do get_next_in_queue { |s| THINGS } end def get_next_in_queue queue_dir = Dir[File.dirname(__FILE__)+'/../queue'] info = YAML::load_file(queue_dir[0]) #not sure if this works or not yield info end I'd like to make the yield conditional if possible, so it only happens if a file is actually found. Thanks!

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  • C++ Pass a hidden arg to a class constructor?

    - by JP
    I would like to define a class that accept the pointer to it's parent class as an Argument, but would it be possible to somehow pass it without needing to pass it directly such as: class Child { public: Child(Parent* hiddenArg); }; class Parent { public: Child myChild; }; I know this is weird, but I am making my own Signal/Slot implementation and Child would be a signal defined, but I would like to get the parent so I can use it's Event Dispatcher...

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  • equivalent of javascript class using JSON

    - by brz dot net
    See following class: function availItem(xs, s, m, l, xl) { this.xs = xs; this.s = s; this.m = m; this.l = l; this.xl = xl; } How can I declare the above class using JSON? I think It should be in following manner but problem is to pass argument. var availItem = { xs : xs, s : s, m : m, l : l, xl : xl }

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  • Does a syntax for this exist? In any language?

    - by Michael
    It seems pretty common to me to have an argument, in a dynamically typed language that is either an Object or a key to lookup that object. For instance when I'm working with a database I might have a method getMyRelatedStuff(person) All I really need to lookup the related stuff is the id of the person so my method could look like this in python: def getMyRelatedStuff(person_or_id): id = person_or_id.id if isinstance(person,User) else person_or_id #do some lookup Or going the other direction: def someFileStuff(file_or_name): file = file_or_name if hasattr(file,'write') else open(file_or_name)

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  • VIM plugin for updating C++ function definition

    - by Sunny
    I'm looking for a VIM plugin that can do these kind of thing. Let's say I have a function in a .cpp file void myFunction(int arg1, int arg2, int arg3){ //code } The function definition is defined in the .h file. So every time I change the function name or add a new argument to the function, I have to go back the the .h file to do the same. Is there a VIM plugin that can automate this task?

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  • How to run multiple arguments in Cygwin

    - by danutenshu
    I've been trying to run a program that will invert the order of a string and to run it, I have to type a second argument in prompt. int main(int argc, char* argv[]) { string text = argv[2]; for (int num=text.size(); num>./0; num--) { cout << text.at(num); } return 0; } e.g. ./program lorem result: merol

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  • Why -use-network=false

    - by dejaninic
    Hi guys. Dose anyone knows why I have to use -use-network=false in my Flex Builder?!?!?! This is set inside the Project Properties and is Additional compiler argument. This is only when I want to read in a external file like XML. Others in my team doesn't have to have -use-network=false ????

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  • Get a list/tuple/dict of *all* the arguments passed to a function?

    - by Phillip Oldham
    Given the following function: def foo(a, b, c): pass How would one obtain a list/tuple/dict/etc of the arguments passed in? Specifically, I'm looking for Python's version of JavaScript's arguments keyword or PHP's func_get_args() method. What I'm not looking for is a solution using *args or **kwargs; I need to specify the argument names in the function definition (to ensure they're being passed in) but within the function I want to work with them in a list- or dict-style structure.

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