new-operator

问题 I'm using Single File Photo Gallery and want to make one mod to the script... Currently the images open in a new pop up window when left-clicked. If you right click on the image thumb it allows the option for "Open Link" but not "Open Link in New Window" or (most importantly for what I want to achieve) "Open Link in New Tab". I've done quite a bit of googling, but since I'm not proficient in php (sort of learn-as-I-go) the few things I've found don't seem to work. I've narrowed the part of

问题 Is it possible to sign up for the event that fires when the object of the specific type is created, not modifying the object? for example, signing for this event of Label type fires it when every instance of Label is created (passing the instance of Label as parameter) sorry for my bad English 回答1: This would be best accomplished using a Factory pattern. If you wrap the creation of your Label objects in a LabelFactory, then the Label Factory could also expose an event that gets fired every

问题 I need a double pointer of type DizzyCreature (my class) to point to an array of DizzyCreature pointers. When I run it I get "Access violation reading location 0x...". I can make a DizzyCreature* and call its member functions just fine, but when cannot run through the array and do the same thing for each obj. I am following these instructions: http://www.cplusplus.com/forum/beginner/10377/ Code Server.h: class Server { public: Server(int x, int y, int count); ~Server(void); void tick();

问题 i went through overloading new and delete , I was reading in a book that the difference between new and malloc is that new call the constructor,returns the type of calling variable and the third difference is that we can overload new on class by class basis, whereas malloc cant be, can someone explain this class by class basis also. 回答1: ::operator new in the global namespace can be replaced (overridden), not overloaded. This causes the override to be used instead of the function provided by

问题 Pedantically, this may not be OK. As per cppref: If expression is anything else, including if it is a pointer obtained by the array form of new-expression, the behavior is undefined. Putting that aside, is the following code OK in practice ( T is non-array, and assuming that new is not replaced)? auto p = (T*)operator new(sizeof(T)); new(p) T{}; delete p; It is said that in cppref that When calling the allocation function, the new-expression passes the number of bytes requested as the first

问题 This question already has answers here : Why doesn't delete set the pointer to NULL? (12 answers) Why doesn't free(p) set p to NULL? (9 answers) Closed 2 years ago . I have small piece of code: #include <iostream> using namespace std; int main() { int *p = new int(10); if(p != NULL) { cout<<"Deleted dynamic allocated memory"<<endl; delete p; } if(p == NULL) { cout<<"NULL"<<endl; } else { cout<<"Not NULL"<<endl; } return 0; } After deleting dynamic allocated memory using delete operator, Why

问题 I have a class Bullet that takes several arguments for its construction. However, I am using a dynamic memory array to store them. I am using C++ so i want to conform to it's standard by using the new operator to allocate the memory. The problem is that the new operator is asking for the constructor arguments when I'm allocating the array, which I don't have at that time. I can accomplish this using malloc to get the right size then fill in form there, but that's not what i want to use :) any

问题 Consider the following code: public abstract class Test1 { public object Data { get; set; } } public abstract class Test2<T> : Test1 { public T Data { get; set; } } This will generate the following warning: 'Test2.Data' hides inherited member 'Test1.Data'. Use the new keyword if hiding was intended. Why is this only a warning and what effect will adding the "new" keyword have? According to my testing I cannot find any difference once the "new" keyword is added. Don't get me wrong, I'm all for

问题 Here's the problem, which only occurs in Internet Explorer (IE) . I have a page that has links to several different types of files. Links from these files execute a Javascript function that opens a new window and loads the specific file. This works great, unless the file I need to open in the new window is a PDF in which case the window is blank, even though the URL is in the address field. Refreshing that window using F5 doesn't help. However, if I put the cursor in the address field and

问题 Is creating objects by hand , i.e. using new operator instead of registering Spring bean and using dependency injection considered bad practice? I mean, does Spring IoC container have to know about all objects in the application? If so, why? 回答1: You want Spring to create beans for classes that : you want/need to inject instance(s) in other beans you need to inject beans (or dependencies) in their own instances. you want them to benefit from Spring features (instantiation management,