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• Is it a good idea to create an STL iterator which is noncopyable?

  - by BillyONeal

  Most of the time, STL iterators are CopyConstructable, because several STL algorithms require this to improve performance, such as std::sort. However, I've been working on a pet project to wrap the FindXFile API (previously asked about), but the problem is it's impossible to implement a copyable iterator around this API. A find handle cannot be…

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• Writing a custom iterator -- what to do if you're at the end of the array?

  - by Goose Bumper

  I'm writing a custom iterator for a Matrix class, and I want to implement the increment method, which gets called when the iterator is incremented: void MatrixIterator::increment() { // go to the next element } Suppose the iterator has been incremented too many times and now points to past the end of the matrix (i.e. past the…

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• Why does string::find return size_type and not an iterator?

  - by dehmann

  In C++, why does string::find return size_type and not an iterator? It would make sense because functions like string::replace or string::insert take iterators as input, so you could find some character and immediately pass the returned iterator to replace, etc. Also, std::find returns an iterator -- why is std::string::find…

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• ServiceLoader double iterator issues

  - by buge

  Is this a known issue? I had trouble finding any search results. When iterating over a ServiceLoader while an iteration already is in progress, the first iteration will be aborted. For example, assuming there are at least two implementations of Foo, the following code will fail with an AssertionError: ServiceLoader<Foo>…

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• Iterator in Java.

  - by theband

  What is Iterator and collections? Does these two have any relations? // the interface definition Interface Iterator { boolean hasNext(); Object next(); // note "one-way" traffic void remove(); } // an example public static void main (String[] args){ ArrayList cars = new ArrayList(); for (int i = 0; i < 12; i++) cars.add…

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• Writing my own implementation of stl-like Iterator in C++.

  - by Negai

  Good evening everybody, I'm currently trying to understand the intrinsics of iterators in various languages i.e. the way they are implemented. For example, there is the following class exposing the list interface. template<class T> class List { public: virtual void Insert( int beforeIndex, const T item )…

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• libgdx - #iterator() cannot be used nested

  - by TimSim

  I'm getting this error when I try to check if any of the targets overlap each other: iterTargets = targets.iterator(); while (iterTargets.hasNext()) { Target target = iterTargets.next(); for (Target otherTarget:targets) { if (target.rectangle.overlaps(otherTarget.rectangle)) { // do something …

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• pushing back an boost::ptr_vector<...>::iterator in another boost::ptr_vector?

  - by Ethan Nash

  Hi all, I have the following code (just typed it in here, might have typos or stuff): typedef boost::ptr_vector<SomeClass> tvec; tvec v; // ... fill v ... tvec vsnap; for(tvec::iterator it = v.begin(); it != v.end(); ++it) { if((*v).anyCondition) vsnap.push_back( it ); // (*it) or &(*it) doesn't…

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• How to get the number of loop when using an iterator, in C++?

  - by pollux

  Dear reader, I'm working on a aplication where I draw a couple of images, like this: void TimeSlice::draw(float fX, float fY) { list<TimeSliceLevel*>::iterator it = levels.begin(); float level_x = x; float level_y = y; while(it != levels.end()) { (*it)->draw(level_x,level_y); level_y +=…

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• Why only random-access-iterator implements operator+ in C++?

  - by xopht

  I'd like get far next value for STL list iterator but it doesn't implement operator+, vector has it though. Why and how can I get the value where I want? I think I can do that if I call operator++ several times, but isn't that a little bit dirty? What I want to do is the following: list<int> l;…

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• build error with boost spirit grammar (boost 1.43 and g++ 4.4.1)

  - by lurscher

  I'm having issues getting a small spirit/qi grammar to compile. The build stack trace is fugly enought to not make any sense to me (despite some assertion_failed i could notice in there but that didn't brought much information) the input grammar header: inputGrammar.h #include…

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• Stateful Iterators Java

  - by Gitmo

  What is a Stateful Iterator? This question relates to an Iterator defined in Hadoop for performing Joins. As the reference documentation states: This defines an interface to a stateful Iterator that can replay elements added to it directly. Note that this does not extend …

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• Isn't an Iterator in c++ a kind of a pointer?

  - by Bilthon

  Ok this time I decided to make a list using the STL. I need to create a dedicated TCP socket for each client. So everytime I've got a connection, I instantiate a socket and add a pointer to it on a list. list<MyTcp*> SocketList; //This is the list of pointers to sockets…

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• Why do iterators in Python raise an exception?

  - by NullUserException

  Here's the syntax for iterators in Java (somewhat similar syntax in C#): Iterator it = sequence.iterator(); while (it.hasNext()) { System.out.println(it.next()); } Which makes sense. Here's the equivalent syntax in Python: it = iter(sequence) while True: try: …

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• Iterator not accessible because of private inheritance

  - by Bo Tian

  I've created a new class that composes std::deque by private inheritance, i.e, class B : private std::deque<A> { ... }; and in my source code I tried to use iterator of B, i.e., B::iterator it The compiler error is error C2247: 'std::deque<_Ty>::iterator'…

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• How do I get an Iterator over a vector of objects from a Template?

  - by nieldw

  I'm busy implementing a Graph ADT in C++. I have templates for the Edges and the Vertices. At each Vertex I have a vector containing pointers to the Edges that are incident to it. Now I'm trying to get an iterator over those edges. These are the lines of code: …

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• Is there an easy way to copy an iterator into a list in Java?

  - by Space_C0wb0y

  I want something like this: public void CopyIteratorIntoList(Iterator<Foo> fooIterator) { List<Foo> fooList = new ArrayList<Foo>(); fooList.addAll(fooIterator); } which should be equivalent to: public void…

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• Obtain container type from (its) iterator type in C++ (STL)

  - by KRao

  It is easy given a container to get the associated iterators, example: std::vector<double>::iterator i; //An iterator to a std::vector<double> I was wondering if it is possible, given an iterator type, to deduce the type…

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• Random begining index iterator for HashSet

  - by funktku

  I use HashSet for add(); remove(); clear(); iterator(); methods. So far everything worked like a charm. However, now I need to fulfill a different requirement. I'd like to be able to start iterating from a certain index. For example,…

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• Any big difference between using contains or loop through a list?

  - by Nazgulled

  Hi, Performance wise, is there really a big difference between using: ArrayList.contains(o) vs foreach|iterator LinkedList.contains(o) vs foreach|iterator HashMap.(containsKey|containsValue) vs foreach|iterator…

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• Wrapper iterator class for stl associative containers

  C++ librairy to facilitate usage of the STL algorithms and BOOST_FOREACH with Pair Associative Containers ( map, unordered_map )

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• Iterator

  Imagine that you are game developer. Your game is war stategy. Army has complicated structure: it consists with Hero and three Groups. When King gives decree to treat all soldiers (Hero is also soldier) you want…

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• Rationale of C# iterators design (comparing to C++)

  - by macias

  I found similar topic: http://stackoverflow.com/questions/56347/iterators-in-c-stl-vs-java-is-there-a-conceptual-difference Which basically deals with Java iterator (which is similar to C#) being unable to…

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• Trying to use a list iterator to print out entire linked list in Java. Infinite loop for some reaso

  - by Matt

  I created my list: private static List list = new LinkedList(); and my iterator: ListIterator itr = list.listIterator(); and use this code to try to print out the list... Only problem is, it never comes…

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• scala implicit or explicit conversion from iterator to iterable

  - by landon9720

  Does Scala provide a built-in class, utility, syntax, or other mechanism for converting (by wrapping) an Iterator with an Iterable? For example, I have an Iterator[Foo] and I need an Iterable[Foo], so…

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