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• any stl/boost functors to call operator()

  - by Voivoid

  template <typename T> struct Foo { void operator()(T& t) { t(); } }; Is there any standart or boost functor with the similar implementation? I need it to iterate over container of functors: std::for_each(beginIter, endIter, Foo<Bar>()); Or maybe there are other way to do it?

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• XML allows for external entities; what about XHTML?

  - by xtofl

  This question about web page 'inclusion' triggered my curiosity. The XML allows you to specify a reference to an 'external' portion. Can you do the same in XHTML, then? XML example: <!ENTITY foo SYSTEM "http://www.mydomain.com/logo.gif" NDATA GIF87A> ... <SOMETHING>&foo;</SOMETHING>

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• Can this be done in 1 line? [PHP]

  - by Angelo

  Can this be done in 1 line with PHP? Would be awesome if it could: $out = array("foo","bar"); echo $out[0]; Something such as: echo array("foo","bar")[0]; Unfortunately that's not possible. Would it be possible like this? So I can do this for example in 1 line: echo array(rand(1,100), rand(1000,2000))[rand(0,1)];

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• creating proxy object in groovy

  - by IttayD

  Hi, I am looking for how to write a method that accepts some value and returns a proxy to that value where the underlying value can be retrieved with an accessor: def p = toProxy(1) assert p == 1 assert p * 2 == 2 assert p.underlying == 1 def p2 = toProxy(objWithMethodFoo) p2.foo() p2.underlying.foo() I want to do this per object instance (not for all objects of some class) and without the need to use special 'use' constructs.

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• Deleting document attachments in CouchDb

  - by henrik_lundgren

  In CouchDb's documentation, the described method of deleting document attachments is to send a DELETE call to the attachment's url. However, I have noticed that if you edit the document and remove the attachment stub from the _attachment field, it will not be accessible anymore. If i remove foo.txt from the document below and save to CouchDb it will be gone the next time I access the document: { "_id":"attachment_doc", "_rev":1589456116, "_attachments": { "foo.txt": { "stub":true, "content_type":"text/plain", "length":29 } } } Is the attachment actually deleted on disk or is just the reference to it deleted?

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• CodeContracts: How to fullfill Require in Ctor using this() call?

  - by mafutrct

  I'm playing around with Microsoft's CodeContracts and encountered a problem I was unable to solve. I've got a class with two constructors: public Foo (public float f) { Contracts.Require(f > 0); } public Foo (int i) : this ((float)i) {} The example is simplified. I don't know how to check the second constructor's f for being 0. Is this even possible with Contracts?

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• Serialize the @property methods in a Python class.

  - by ashchristopher

  Is there a way to have any @property definitions passed through to a json serializer when serializing a Django model class? example: class FooBar(object.Model) name = models.CharField(...) @property def foo(self): return "My name is %s" %self.name Want to serialize to: [{ 'name' : 'Test User', 'foo' : 'My name is Test User', },]

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• C++ WCHAR: Cannot allocate an array of constant size 0

  - by Rosarch

  I'm trying to create a WCHAR: LONG bufferSize = foo.bar() + 1; WCHAR wszBaz[bufferSize]; The compiler issues an error: error C2057: expected constant expression error C2466: cannot allocate an array of constant size 0 error C2133: 'wszBaz' unknown size What am I doing wrong? UPDATE: I added const but it still gives the same error: const LONG bufferSize = foo.bar() + 1; WCHAR wszBaz[bufferSize];

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• Ruby parse order

  - by bresc

  Hi, given this code: class Foo def bar return Bar.new end end class Bar ... end I get this error: NameError: uninitialized constant Bar This obviously works if I put Bar before Foo but that is not a real solution though. Any ideas on how to solve this without considering the order? Many thanks.

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• How to run jQuery onClick? Need to pass a variable to run .ajax

  - by user205307

  I'm trying to run .ajax and insert a data element from the onClick of an item from the page. Whats the best way to do this? Something like this: function grabinfo(foo){ $.ajax({ url: "infospitter", method: "GET", data: "id="+foo, success: function(html){ $(#showstuff).html(html); } }); } <input onClick="javascript:grabinfo(18343)" /> // and on page each item will have this button input

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• Is it standard C++ to set the value of a member pointer to the address of another member in the cons

  - by SilverSun

  Is this valid? class Foo { Bar m_bar; Bar * m_woo; public: Foo() : m_bar(42, 123), m_woo(&m_bar) { } };

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• Sinatra programatically get port and other information about service

  - by Poul

  I have a sinatra service foo.rb To run it I on a different port I would type "ruby foo.rb -p 5000". While the program is running I would like to be able to get the port (in this case 5000) and other information. Is there a way to get info like this while the app is running? Thanks

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• Python indentation in "empty lines"

  - by niscy

  Which is preferred ("." indicating whitespace)? A) def foo(): x = 1 y = 2 .... if True: bar() B) def foo(): x = 1 y = 2 if True: bar() My intuition would be B (that's also what vim does for me), but I see people using A) all the time. Is it just because most of the editors out there are broken?

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• How do I branch if message.properties-code exists

  - by skurt

  I want to branch if a message-property-code does exist or not. <g:if test="${message(code: 'default.code.foo')}"> true </g:if><g:else> false </g:else> should answer true if there a message property named default.code.foo and false if not. It fails because it answers the code if there is no property for it.

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• How would I reverse an array of characters?

  - by jreicher

  Lets say I have an array of characters: char* foo = "abcdefg"; How would I reverse them but keep them within the array "foo"?

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• best scala idiom for find & return

  - by IttayD

  This is something I encounter frequently, but I don't know the elegant way of doing. I have a collection of Foo objects. Foo has a method bar() that may return null or a Bar object. I want to scan the collection, calling each object's bar() method and stop on the first one returning an actual reference and return that reference from the scan. Obviously: foos.find(_.bar != null).bar does the trick, but calls #bar twice.

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• In Vim, how to swap 2 non adjacent patterns?

  - by ThG

  I have lines of text, all with the same structure, and would like to make a permutation of 2 elements on all lines: 1257654 some text (which may be long) #Foo 1543098 some other text #Barbar 1238769 whatever #Baz 2456874 something else #Quux I want to obtain : #Foo some text (which may be long) 1257654 #Barbar some other text 1543098 #Baz whatever 1238769 #Quux something else 2456874 This is where I am stuck : :%s/\(\d\{7\}\)\(#.\{-}\)/\2\1/ Where did I go wrong ?

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• Is there a equivalent in C for C++ templates?

  - by nunos

  In the code I am writing I need a foo(int, char*) and a foo(int, int) functions. If I was coding this in C++ I would use templates. Is there any equivalent for C? Or should I use void pointers? How? Thanks.

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• Are PHP5 objects passed by reference?

  - by morpheous

  I cant seem to get any consistent info on this. Different sources appear to say different things and trhe venerable php.net iteslf (appears) not to explicitly state this - although I must admit, I only had a quick look. In cases where I am passing around 'heavy' objects, I need to pass by reference, but I dont want to keep typing: function foo(TypeName& $obj) if I can get away with simply, function foo(TypeName $obj) So what does the standard say?

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• Ruby multiple background threads

  - by turri

  I need to run multiple background threads in a thread pool with timeout. The scheme is something like: #!/usr/bin/env ruby require 'thread' def foo(&block) bar(block) end def bar(block) Thread.abort_on_exception=true @main = Thread.new { block.call } end foo { sleep 1 puts 'test' } Why if i run that i get no output? (and no sleep wait?)

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• In Javascript, if there is an object with a lot of properties that are functions, how do you convert

  - by Jian Lin

  In Javascript, if an object has lots of properties that are functions: var obj = { foo: function() { ... }, bar: function() { ... }, ... } then how can you get an array of names of those functions? That is, an array ["foo", "bar", ... ] thanks.

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• Initialising a reference member with itself legal?

  - by epronk

  This was a bug I found in a server application using Valgrind. struct Foo { Foo(const std::string& a) : a_(a_) { } const std::string& a_; }; with gcc -Wall you don't get a warning. Why is this legal code?

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• Multithreaded ActiveRecord requests in rspec

  - by jeem

  I'm trying to recreate a race condition in a test, so I can try out some solutions. I find that in the threads I create in my test, ActiveRecord always returns 0 for counts and nil for finds. For example, with 3 rows in the table "foos": it "whatever" do puts Foo.count 5.times do Thread.new do puts Foo.count end end end will print 3 0 0 0 0 0 test.log shows the expected query, the expected 6 times: SELECT count(*) AS count_all FROM `active_agents` Any idea what's going on here?

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• C++ static array leading to memory leak?

  - by MDonovin

  Lets say I have something like... void foo() { char c[100]; printf("this function does nothing useful"); } When foo is called, it creates the array on the stack, and when it goes out of scope, is the memory deallocated automatically? Or is c destroyed, but the memory remains allocated, with no way to access it/get it back except restarting the computer?

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• Do I have to initialize simple class member variables?

  - by Frank

  Quick beginner's question: Do I have to initialize simple class member variables, or are they guaranteed to get assigned their default values in any case? Example: class Foo { int i; // is i==0 or do I need the following line for that? Foo() : i(0) {} }; Thanks!

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