self-reference

问题 Is it possible for a function that is inside a DLL to unload the DLL? I need to do this so I can make sure the DLL is not in use, then write to the DLL's file. 回答1: I don't think it will work. Calling FreeLibrary with a handle from the outside (LoadLibrary would have been called from an area outside the DLL) as the code runs in a memory location that will not be valid anymore. Even if this is possible, it smells like a bad design. Maybe you want to make some updater or alike. Explain a bit

问题 Is it possible for a function that is inside a DLL to unload the DLL? I need to do this so I can make sure the DLL is not in use, then write to the DLL's file. 回答1: I don't think it will work. Calling FreeLibrary with a handle from the outside (LoadLibrary would have been called from an area outside the DLL) as the code runs in a memory location that will not be valid anymore. Even if this is possible, it smells like a bad design. Maybe you want to make some updater or alike. Explain a bit

问题 I have a table upload_temp as it follows: CREATE TABLE upload_temp ( codigo serial PRIMARY KEY NOT NULL, codigo_upload_temp_pai INTEGER, nome TEXT NOT NULL, codigo_extensao INTEGER, data_inclusao TIMESTAMP NOT NULL DEFAULT NOW(), codigo_usuario_inclusao INTEGER NOT NULL, CONSTRAINT fk_upload_upload_pai FOREIGN KEY (codigo_upload_temp_pai) REFERENCES upload_temp (codigo) MATCH SIMPLE ON UPDATE CASCADE ON DELETE CASCADE, CONSTRAINT fk_extensao_upload FOREIGN KEY (codigo_extensao) REFERENCES

问题 At runtime, either the assembler or machine code (which is it?) should be somewhere in RAM. Can I somehow get access to it, and read or even write to it? This is just for educational purposes. So, I just could compile this code. Am I really reading myself here? #include <stdio.h> #include <sys/mman.h> int main() { void *p = (void *)main; mprotect(p, 4098, PROT_READ | PROT_WRITE | PROT_EXEC); printf("Main: %p\n Content: %i", p, *(int *)(p+2)); unsigned int size = 16; for (unsigned int i = 0; i

问题 I am successfully using a self referencing table in entity framework. But I can't figure out how to get the records of the desired depth ? What should be the logic for this ? Model : public class FamilyLabel { public FamilyLabel() { this.Children = new Collection<FamilyLabel>(); this.Families = new Collection<Family>(); } [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int FamilyLabelId { get; set; } public string FamilyLabelName { get; set; } public virtual FamilyLabel

问题 I've been reading an article by Olin Shivers titled Stylish Lisp programming techniques and found the second example there (labeled "Technique n-1") a bit puzzling. It describes a self-modifying macro that looks like this: (defun gen-counter macro (x) (let ((ans (cadr x))) (rplaca (cdr x) (+ 1 ans)) ans)) It's supposed to get its calling form as argument x (i.e. (gen-counter <some-number>) ). The purpose of this is to be able to do something like this: > ;this prints out the numbers from 0 to

问题 My needs are very simple: I have a Tip table to receive comments and have comments to receive comments, too. To retrieve each comment that is stored in the same table (comments), I created another key for the comments on comments: "inverse_comments". I tried to use one comments table by using self-referntial association. Some resources seem to bring more than one table into the piture which are diffent from my needs. So I came up whth the following modeling for comments: class Comment <

问题 Is the following code valid C++, according to the standard (discounting the ...s)? bool f(T& r) { if(...) { r = ...; return true; } return false; } T x = (f(x) ? x : T()); It is known to compile in the GCC versions this project uses (4.1.2 and 3.2.3... don't even get me started...), but should it? Edit : I added some details, for example as to how f() conceptually looks like in the original code. Basically, it's meant to be initialize x in certain conditions. 回答1: Syntactically it is, however

问题 i have used a generic interface and repository in this tugberkugurlu, which is... public interface IGenericRepository<T> where T : class { IQueryable<T> GetAll(); IQueryable<T> FindBy(Expression<Func<T, bool>> predicate); void Add(T entity); void Delete(T entity); void Edit(T entity); void Save(); } and this generic repository public abstract class GenericRepository<C, T> : IGenericRepository<T> where T : class where C : DbContext, new() { private C _entities = new C(); public C Context { get

问题 I have a category class and it can reference itself(only one level up) as parent category. When I retrieve the data using dbContext using Entity Framework, the parent relationship is not loaded. How do I go about achieving that? Here is the class public class Category { [Key] public int CategoryID { get; set; } [Display(Name="Category Name")] public string CategoryName { get; set; } public int ParentCategoryID { get; set; } public virtual Category ParentCategory { get; set; } } when I