overriding

问题 For example, if I want to override malloc(), what's the best way to do it? Currently the simplest way I know of is: malloc.h #include <stdlib.h> #define malloc my_malloc void* my_malloc (size_t size); foobar.c #include "malloc.h" void foobar(void) { void* leak = malloc(1024); } The problem with this approach is that we now have to use "malloc.h" and can never use "stdlib.h". Is there a way around this? I'm particularly interested in importing 3rd party libraries without modifying them at all,

问题 In the following, I have a Post model. A Post object has a status field that can be 'unpublished' or 'published' . if status is 'published' , I'd like to prevent the object from being deleted, and would like to keep this logic encapsulated in the model itself. from model_utils import Choices # from Django-Model-Utils from model_utils.fields import StatusField class Post(model.Models) STATUS = Choices( ('unpublished', _('Unpublished')), ('published', _('Published')), ) ... status = StatusField

问题 In the following, I have a Post model. A Post object has a status field that can be 'unpublished' or 'published' . if status is 'published' , I'd like to prevent the object from being deleted, and would like to keep this logic encapsulated in the model itself. from model_utils import Choices # from Django-Model-Utils from model_utils.fields import StatusField class Post(model.Models) STATUS = Choices( ('unpublished', _('Unpublished')), ('published', _('Published')), ) ... status = StatusField

问题 I want to make a simple modification in a PHP file located here in my parent theme: wp-content\themes\sailing\inc\widgets\gallery\tpl\base.php So I created the same folder structure in my child theme and did the modification I need in this file. I also copied/pasted all the PHP files needed to declare this widget. wp-content\themes\sailing\inc\widgets\widgets.php wp-content\themes\sailing\inc\widgets\gallery\gallery.php wp-content\themes\sailing-child\inc\widgets\widgets.php wp-content\themes

问题 I want to override FOSUserBundle so that I can add extra fields(name,avatar,...) to user entity . I also want to create a command like fos:user:create for creating user,so I create createUserCommand.php and override UserManipulator.php but when runnig command it comes with this error Column 'name' cannot be null I think I must override UserInteface,UserManager and ... But in this way I have to override almost whole FOSUserBundle !! Is there any good tutorial that explain how to do this job ?

问题 My override is not working I tried to add a custom.css the safe way to our default bootstrap theme. I followed this tutorial: http://www.prestadb.com/prestashop-override-controllers-tutorial/ The difference to 1.6 should be that the file should be placed in: /override/controllers/front instead of /overrides/controllers/ In the first mentioned directory I have a file called FrontControllerCore.php with following content: <?php class FrontController extends FrontControllerCore { public function

问题 My override is not working I tried to add a custom.css the safe way to our default bootstrap theme. I followed this tutorial: http://www.prestadb.com/prestashop-override-controllers-tutorial/ The difference to 1.6 should be that the file should be placed in: /override/controllers/front instead of /overrides/controllers/ In the first mentioned directory I have a file called FrontControllerCore.php with following content: <?php class FrontController extends FrontControllerCore { public function

问题 I am trying to plan how to add a couple methods to all instances of certain objects. I think adding a category to the parent object(UIViewController) would work for what I want to do, but can I override a method added this way? Most of the time the subclasses will use the default methods but I do know I will need to override the method at least once. Also what other methods should I consider for what I am trying to do? Example of what I am trying to do: I have a set of Objects that act like

问题 I am trying to plan how to add a couple methods to all instances of certain objects. I think adding a category to the parent object(UIViewController) would work for what I want to do, but can I override a method added this way? Most of the time the subclasses will use the default methods but I do know I will need to override the method at least once. Also what other methods should I consider for what I am trying to do? Example of what I am trying to do: I have a set of Objects that act like

问题 I have a custom user manager class (ASP .NET Identity). I want to override the FindByIdMethod, so that it automatically loads the role names for the user model. This is the only method I am overriding. I am using Microsoft.Identity nuget packages version 2.2.1, Asp.Net Framework. However, the code below throws a StackOverflow exception - at await base.FindByIdAsync(userId); public class MyUserManager : UserManager<MyUser>, IMyUserManager { public override async Task<MyUser> FindByIdAsync