virtual

I want a pure virtual parent class to call a child implementation of a function like so: class parent { public: void Read() { //read stuff } virtual void Process() = 0; parent() { Read(); Process(); } } class child : public parent { public: virtual void Process() { //process stuff } child() : parent() { } } int main() { child c; } This should work, but I get an unlinked error :/ This is using VC++ 2k3 Or shouldn't it work, am I wrong? Title of the following article says it all: Never Call Virtual Functions during Construction or Destruction . Alternatively, make a factory method for creating

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have following code: #include <iostream> using namespace std; class Child1 { int i; }; class Child2 : public Child1 { int j; }; class Base1 { public: virtual Child1& getChildren() { cout << "Children1" << endl; return children; } private: Child1 children; }; class Base2 : public Base1 { public: virtual Child2& getChildren() { cout << "Children2" << endl; return children; } private: Child2 children; }; This code compiles fine but when I change the return type of getChildren() from reference type to object type in either or both Base1 and

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Why do we save memory if we use inverted page tables to map virtual addresses to physical ones? If we have for example two processes which both have 4 pages we would have 8 entries in two different tables pointing from virtual to physical address: Process 1 : [ 0 ] = 1 [ 1 ] = 5 [ 2 ] = 63 [ 3 ] = 0 Process 2 : [ 20 ] = 14 [ 21 ] = 55 [ 22 ] = 11 [ 25 ] = 9 If we would use inverted page tables we would only have one big table pointing it the other way around. But in size they equal. 2 ) Inverted page table [ 0 ] = < p1 | 3 > [ 1 ]

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a circle model in my project: var circleSchema = new Schema({ //circleId: {type: String, unique: true, required: true}, patientID: {type: Schema.Types.ObjectId, ref: "patient"}, circleName: String, caregivers: [{type: Schema.Types.ObjectId}], accessLevel: Schema.Types.Mixed }); circleSchema.virtual('caregiver_details',{ ref: 'caregiver', localField: 'caregivers', foreignField: 'userId' }); caregiver schema: var cargiverSchema = new Schema({ userId: {type: Schema.ObjectId, unique: true}, //objectId of user document detailId: {type:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a following class: MyClass public virtual int Id { get; set; } public virtual int Code { get; set; } public virtual int Description { get; set; } public virtual int Name { get; set; } with the following mapping: <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="TestApplication" assembly="TestApplication"> <class name="MyClass" table="MyTable"> <id name="Id" column="id"> <generator class="native"/> </id> <property name="Code" column="code"/> <property name="Description" column=

I have a problem in setting up django. My situation: I have Anaconda Python 2.7 in my Windows 8 computer. On the Anaconda command prompt window, I type: pip install django . This is successful. Then I create a folder named "newproject". On the command prompt I went to the folder "newproject". Then django-admin.py startproject newproject . This is successful. Then I run python manage.py runserver . It tells me "...can't open file 'manage.py': [Errno 2] No such file or directory" I checked out udemy django installation guide and other guides on the net. I have even set up a virtual environment.

Can anyone explain the output of the following code? #include <iostream> #include <string> class Animal { public: Animal(const std::string & name) : _name(name) { } ~Animal() { } virtual void printMessage() const { std::cout << "Hello, I'm " << _name << std::endl; } private: std::string _name; // other operators and stuff }; class Cow : public Animal { public: Cow(const std::string & name) : Animal(name) { } ~Cow() { } virtual void printMessage() { Animal::printMessage(); std::cout << "and moo " << std::endl; } }; int main() { Cow cow("bill"); Animal * animal = &cow; cow.printMessage(); animal