circular-dependency

问题 Suppose that I want to keep a certain ordering between the entries of an unordered_map<int, int>. A memory efficient way to do that seems to be keeping a linked list between the entries of the map. Namely instead of having an unordered_map<int, int>, I will use an unordered_map<int, Node> where Node is defined as struct Node { int val; typename std::unordered_map<int, Node>::iterator up; }; Is this valid C++? Clang and gcc do not permit this saying Node is an incomplete type. See below for

问题 trying to have two class that reference each others, in the same file. What would be the best way to have this working: class Foo(object): other = Bar class Bar(object): other = Foo if __name__ == '__main__': print 'all ok' ? The problem seems to be that since the property is on the class, since it tries to executes as soon as the class itself is parsed. Is there a way to solve that? edit: those keys are used for SQLAlchemy mapping, to they realy are class variables (not instance). 回答1: This

问题 I am writing a service that uses Jersey and JAXB. My classes are annotated with @XMLRootElement, @XMLElement, etc. I have a circular dependency between two classes, so I have annotated the circular dependent property with @XMLTransient. So when I call my service I get xml as the default, which works perfectly. However, when I try using JSON, I get repeated lines like: {"name":"dere","entries":[{"points":0,"wins":0,"losses":0,"ties":0,"leaderboard":{"name":"dere","entries":[{"points":0,"wins"

问题 I have a project that uses gradle, flyway gradle plugin, mybatis generator and postgres. In my build.gradle, I have: compileJava.dependsOn('myBatisGenerator') I would like to run the flywayMigrate task before myBatisGenerator runs. So I did the following: myBatisGenerator.dependsOn('flywayMigrate') And when I try to run the build using gradle test, I get the following error: FAILURE: Build failed with an exception. * What went wrong: Circular dependency between the following tasks: :classes +

问题 I've a bunch of small services that share some common packages like Logger , Configuration and Net . And I wrote each package in separated project. The issue is that my Logger needs package Configuration for set up. And my Configuration ( not solely used by Logger ) wants to write output log when necessary. Therefore, I've circular dependency flaw Logger --> Configuration , Configuration --> Logger . How can I redesign this code? 回答1: Something similar to this came up at GopherCon this year

问题 Hi I have a question about some circular relationships that I am facing with my database design . I read a few more similar questions but couldn't solve my problem, so here is my class diagram : and here is the logic: A document belongs to a DocumentType ( invoice , order form , ..) a documentField ( date , address , nameClient , ... ) belongs to a documentType ( each documentType has its proper fields the FieldValue is the value of documentfield that will be saved in database it belongs to

问题 I'm working on a reasonably large Laravel project and am using Repositories. I have a user repository which injects its dependencies like so: public function __construct(CartRepository $cartRepo...) This causes the following error: Maximum function nesting level of '100' reached, aborting! I think this is because the CartRepo injects an ItemRepo which in turn injects the UserRepo, causing an infinite nesting loop. What I don't get is how to find away around this, the ItemRepo needs the

问题 I suppose you all know what is circular dependency in headers. The result of it usually are like the following: error: 'MyClass' was not declared in this scope If the program is short it is clear what to do. But if the program has tens of files... My question is "Is there some algorithm to find the circular dependency?" I mean some certain steps, which bring you to success, not just "look into the code until you found it". May be some program, which do it? 回答1: The documentation tool Doxygen

问题 I'm using TypeScript with --module system (SystemJS) in a very large project. SystemJS supports cyclic dependencies, and most of the time it works fine. However, when TypeScript inheritance gets involved, things begin to break. For example, if a class A depends on class B , and class B inherits from class A , then if class A gets loaded first: It will pause class A's resolution and will try to load the class B dependency class B will think its dependencies are resolved, since class A has been

问题 Is the following well-defined? class A; class B; // define A, which takes B& in constructor // define B, which takes A& in constructor class C { A a; B b; public: C() : a(b), b(a) { /* stuff with a and b */ } } Full example at ideone.com. Is it safe/well-defined so long as the constructors for A and B don't do anything with the references they get? 回答1: N4140 [class.cdtor]/1 reads: For an object with a non-trivial constructor, referring to any non-static member or base class of the object