parent-child

I have this code that is supposed to create three child process' and each will perform a small mathematical operation. Then, the parent is supposed to use the results from all the child process' and get a final answer but I can't find a way to actually read the result from the child in the parent. Is there a way to do this? #include <stdio.h> #include <unistd.h> #include <stdlib.h> int main(void) { int pid1, pid2, pid3, status; int a=1, b=2, c=5, d=4, e=6, f=3, g; int t1, t2, t3; printf("Hello World!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I've started using (as of, a few hours ago) Durandal with the hope to manage views and allow composition within a single page - the previous approach, also using Knockout, was getting too unwieldy to maintain in a fat HTML file. I've installed/setup Durandal and I can create views and viewmodels - however, I don't know how to get data into the viewmodel to use as a basis for the new viewmodel. For instance, I have a "left nav bar" for selecting items - when an item is selected it updates a "selected item" observable in the current model, but it should also load the correct "detail view" in the

I have a parent and child model relationship. In the child's migration.rb, the child model's columns each have default values (except the parent_id column). When I make a new parent object, how can I make it so that a child object is created and saved into its table with the data from the default values along with the parent_id? I'm thinking that it will have to do with something like an after_create on the parent model, but I'm not sure how to set it up. Revised: I revised the answer to use before_create and building, not creating, the associated models. The ActiveRecord machinery then takes

I have following table: FOLDER[ id int, name varchar2(10), parent_folder_id int ] I would like to have Folder class to have parent-child relationship. I believe the correct mapping would be: @Entity public class Folder { @Id @Column(name="PK_FOLDER") private int id; @Column(name="NAME") private String name; @ManyToOne @JoinColumn(name="FK_PARENT_FOLDER") public Folder parentFolder; @OneToMany(mappedBy="parentFolder") public List<Folder> subFolders = new ArrayList<Folder>(); } The @OneToOne would work only if each parent had at most one child, the above code works for the more general case,

For the last two days, I've been searching for a way to pass mouse events to the widgets behind a widget used as a container/parent for it's children. I know there is a way to make a widget transparent for mouse events like this: QWidget w; w.setAttribute( Qt::WA_TransparentForMouseEvents ); But this also disables the delivery of mouse events to its children! I want the children of the front widget and the widgets behind the front widget to receive the mouse events. Qt::WA_TransparentForMouseEvents: When enabled, this attribute disables the delivery of mouse events to the widget and its