cyclic-reference

I have project in PlayFramework. It has one main project without any code/logic. And it have few submodules: main: admin common shop Modules: admin and shop will base on common module (classes like: user, role, permission), so I have to configure it that way: lazy val shop = project.in(file("modules/shop")) .dependsOn(cirs) .dependsOn(common) .dependsOn(admin) lazy val admin = project.in(file("modules/admin")) .dependsOn(cirs) .dependsOn(common) .dependsOn(shop) But in module common I have view where I wonna display links (a href...) to other submodules. To do this I have to use reverse

I have a multi-module project that looks like this: module1 pom.xml module2 pom.xml pom.xml The pom.xml in module2 has a dependency on module1. When I run mvn clean compile I get the following error: The projects in the reactor contain a cyclic reference. Here are my dependencies in module1: <dependencies> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.14</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.6.1</version> </dependency> <dependency> <groupId>com.jcraft</groupId> <artifactId>jsch<

I recently asked a question about overwriting objects and memory management in Perl. One of the answers I received notified me that I may have an issue with a script I recently wrote. I have a script with some very complex data structures that have many parent->child / child->parent relationships. This also means that there are many objects that have cyclic references. According to this answer , cyclic references can "trick" Perl's reference counting mechanism and cause memory leaks if they are not dealt with properly. Example of a cyclic reference: +-------------------------------------------

I have looked in the official documentation for python, but i cannot seem to find what a reference cycle is. Could anyone please clarify what it is for me, as i am trying to understand the GC module. Thank you in advance for your replies. A reference cycle simply means one or more objects referencing each other, such that if you drew it out on paper with arrows representing the dependencies you would see a cycle. The (almost) simplest reference cycle is having two objects a and b that refer to each other: a.other = b b.some_attr = a Naive garbage collectors work strictly off of whether or not

I was trying with the cyclic references for boost::shared_ptr , and devised following sample: class A{ // Trivial class public: i32 i; A(){} A(i32 a):i(a){} ~A(){ cout<<"~A : "<<i<<endl; } }; shared_ptr<A> changeI(shared_ptr<A> s){ s->i++; cout<<s.use_count()<<'\n'; return s; } int main() { shared_ptr<A> p1 = make_shared<A>(3); shared_ptr<A> p2 = p1; shared_ptr<A> p3 = p2; shared_ptr<A> p4 = p3; p1 = p4; // 1) 1st cyclic ref. cout<<p1.use_count()<<'\n'; p1 = changeI(p4); // 2) 2nd cyclic ref. cout<<p1.use_count()<<'\n'; // putchar('\n'); cout<<endl; } which outputs 4 5 4 ~A : 4 Is it that I've

I am reading Scott Meyers "Effective C++" book. It was mentioned that there are tr1::shared_ptr and tr1::weak_ptr act like built-in pointers, but they keep track of how many tr1::shared_ptrs point to an object. This is known as reference counting. This works well in preventing resource leaks in acyclic data structures, but if two or more objects contain tr1::shared_ptrs such that a cycle is formed, the cycle may keep each other's reference count above zero, even when all external pointers to the cycle have been destroyed. That's where tr1::weak_ptrs come in. My question is how cyclic data

Is there a way to get around the class-loading issues caused by having two enums that reference each other? I have two sets of enumerations, Foo and Bar, defined like so: public class EnumTest { public enum Foo { A(Bar.Alpha), B(Bar.Delta), C(Bar.Alpha); private Foo(Bar b) { this.b = b; } public final Bar b; } public enum Bar { Alpha(Foo.A), Beta(Foo.C), Delta(Foo.C); private Bar(Foo f) { this.f = f; } public final Foo f; } public static void main (String[] args) { for (Foo f: Foo.values()) { System.out.println(f + " bar " + f.b); } for (Bar b: Bar.values()) { System.out.println(b + " foo " +