cyclic-dependency | 易学教程

How to properly handle a circular module dependency in Python?

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问题 Trying to find a good and proper pattern to handle a circular module dependency in Python. Usually, the solution is to remove it (through refactoring); however, in this particular case we would really like to have the functionality that requires the circular import. EDIT : According to answers below, the usual angle of attack for this kind of issue would be a refactor. However, for the sake of this question, assume that is not an option (for whatever reason). The problem: The logging module

How to properly handle a circular module dependency in Python?

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C++: How to solve template cyclic dependency between derived classes when two classes contain a pointer pointing to another?

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问题 I have a parent class and some classes derived from it. I want to 'pair' two derived classes that eac has a pointer to another one. Code example: template<typename DerivedClassName> class Parent { // some stuff DerivedClassName* prtToPair; }; template<typename DerivedClassName> class DerivedA : public Parent<DerivedClassName> { }; template<typename DerivedClassName> class DerivedB : public Parent<DerivedClassName> { }; // compile fails DerivedA<DerivedB> dA; DerivedB<DerivedA> dB; dA

Angular 8: Cannot instantiate cyclic dependency - ActivatedRoute

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来源： https://stackoverflow.com/questions/57206026/angular-8-cannot-instantiate-cyclic-dependency-activatedroute

Resolve circular dependency in gradle

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问题 I recently started developing a java project which has some sub projects within it. All of them are gradle. So let's say there are two projects A and B which is already implemented. And I'm going to introduce another graldle project C. And the dependencies are like this. A has dependencies on B B has dependencies on C C has dependencies on A So I need to implement this project C without cyclic dependencies error as it is given when I tried to build the project with gradle. I saw some answers

Ninject cyclic dependency - already using property injection

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问题 I'm having a problem with a cyclic dependency in a project using dependency injection. In looking around, it seems that the only way to avoid it, other than restructuring (I did some of that too), is to use property injection. I tried this, and it doesn't seem to help, but I'm not sure why. Here is the path that's causing issues. Activation path: 6) Injection of dependency IUserRepository into property UserRepository of type ModelFactory{UserRole} 5) Injection of dependency IUserRoleFactory

C++ Errors: “ 'class' does not name a type” and “invalid use of incomplete type ‘struct …' ”

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问题 Here is a very repetitive issue, also here in StackOverflow, but I do not manage to solve my problem even trying the different answers. So, I have some classes: main.cpp: #include "foo.h" #include "bar.h" ... foo.h: #include "bar.h" class foo { foo(); bar& bind(bar &b); gru& bind(gru &g); }; bar.h: #include "foo.h" class bar { bar(); foo& bind(foo &f); gru& bind(gru &g); }; Clearly, I have a cyclic dependency. So I get the infamous error 'bar' does not name a type . In this case, I add class

Angular 5 APP_INITIALIZER gives Cyclic dependency error

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问题 Angular 5 error. I am having trouble with getting user details on page refresh from browser. I am trying to load the data using APP_INITIALIZER but getting below error - compiler.js:19390 Uncaught Error: Provider parse errors: Cannot instantiate cyclic dependency! ApplicationRef ("[ERROR ->]"): in NgModule AppModule in ./AppModule@-1:-1 Below is my configuration app.module.ts export function initUserFactory(userService: UserService) { return () => { userService.initUser()}; } let INITIAL

How can I use my specs for their intended purposes if they are in a separate namespace?

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问题 One of the examples in the clojure.spec Guide is a simple option-parsing spec: (require '[clojure.spec :as s]) (s/def ::config (s/* (s/cat :prop string? :val (s/alt :s string? :b boolean?)))) (s/conform ::config ["-server" "foo" "-verbose" true "-user" "joe"]) ;;=> [{:prop "-server", :val [:s "foo"]} ;; {:prop "-verbose", :val [:b true]} ;; {:prop "-user", :val [:s "joe"]}] Later, in the validation section, a function is defined that internally conforms its input using this spec: (defn- set

How can I use my specs for their intended purposes if they are in a separate namespace?

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One of the examples in the clojure.spec Guide is a simple option-parsing spec: (require '[clojure.spec :as s]) (s/def ::config (s/* (s/cat :prop string? :val (s/alt :s string? :b boolean?)))) (s/conform ::config ["-server" "foo" "-verbose" true "-user" "joe"]) ;;=> [{:prop "-server", :val [:s "foo"]} ;; {:prop "-verbose", :val [:b true]} ;; {:prop "-user", :val [:s "joe"]}] Later, in the validation section, a function is defined that internally conform s its input using this spec: (defn- set-config [prop val] (println "set" prop val)) (defn configure [input] (let [parsed (s/conform ::config