definition

问题 I want to know how the "isupper" macro is defined in C/C++. Could you please provide me the same or point me to available resources. I tried looking at ctype.h but couldnt figure it out. 回答1: It's implementation defined -- every vendor can, and usually does, do it differently. The most common usually involves a "traits" table - an array with one element for each character, the value of that element being a collection of flags indicates details about the character. An example would be: traits[

问题 I want to know how the "isupper" macro is defined in C/C++. Could you please provide me the same or point me to available resources. I tried looking at ctype.h but couldnt figure it out. 回答1: It's implementation defined -- every vendor can, and usually does, do it differently. The most common usually involves a "traits" table - an array with one element for each character, the value of that element being a collection of flags indicates details about the character. An example would be: traits[

问题 I tried to implement the linked list but couldn't make out what is actually going wrong that it isn't showing the expected result? I tried to trace the control flow of the program by putting in random printfs at suspicious places... I tried to trace the control and realized that after inserting the first node the changes are not getting reflected in the original linked list; after getting back to main() the linked list is empty again! #include<stdio.h> #include<stdlib.h> struct node { int

问题 i'm a computer science student and i'm having some problem understanding the verifier based definition of NP problems. The definition says that a problem is in NP if can be verified in polinomial time by a deterministic turing machine, given a "certificate". But what happens, if the certificate is exactly the problem solution? It's only a bit, and it's obviuosly polinomially limited by the input size, and it's obviously verifiable in constant, thus polinomial time. Therefore, each decision

问题 I am using Ruby 1.9.2 and the Ruby on Rails v3.2.2 gem. I am trying to learn Metaprogramming "the right way" and at this time I am aliasing an instance method in the included do ... end block provided by the RoR ActiveSupport::Concern module: module MyModule extend ActiveSupport::Concern included do # Builds the instance method name. my_method_name = build_method_name.to_sym # => :my_method # Defines the :my_method instance method in the including class of MyModule. define_singleton_method(my

问题 Well, I'm gonna be pretty straightforward here, I just have a piece of code in c++ which I'm not sure I really understand and need some help with. Ok, to simplify lets just say I have a class that is defined like this: (the real class is a little bit more complicated, but this is what matters) class myClass : public Runnable { Semaphore *m_pMySemaphore; __Queue<Requests> *m_pQueue; Request m_Request; VetorSlotBuffer *m_vetorSlotBuffer; } Up to here nothing is wrong, myClass is just a regular

问题 As I mentioned in this post, I faced a for me not understandable compiler behaviour. The code: IEnumerable<IList<MyClass>> myData = //...getMyData foreach (MyClass o in myData){} It compiles, but fails on runtime: InvalidCastException; for me it is obvious. If I change the IList to List as following, it complains: IEnumerable<List<MyClass>> myData = //...getMyData foreach (MyClass o in myData){} When instead of the class type I put var as following, intellisense recognizes the correct type:

问题 I've never seen this syntax before. #define SNS(s) (s),(sizeof(s)-1) The way i'm reading this is that SNS(s) = sizeof(s)-1 . What is the comma doing? Is it necessary? int ft_display_fatal(const char *err, unsigned len, int fd, int rcode) { UNUSED(write(fd, err, len)); return (rcode); } Main return (ft_display_fatal(SNS("File name missing.\n"), 2, 1)); 回答1: Macros are just text replacement, so they can expand to just about anything you want. In this case, the macro is being used to expand into

问题 I am trying to create a class called LinkButton, which is a simple class that loads a URL on a click (im doing this to simpify my designers' transition to AS3) . Even though I am importing the button definition, the AS file gets a compile error: 1046: Type was not found or was not a compile-time constant: Button. and 1172: Definition fl.controls:Button could not be found. I created the button by making a simple shape converting it to a symbol (F8) of type 'Button'. In my FLA file i have this

问题 I am trying to create a class called LinkButton, which is a simple class that loads a URL on a click (im doing this to simpify my designers' transition to AS3) . Even though I am importing the button definition, the AS file gets a compile error: 1046: Type was not found or was not a compile-time constant: Button. and 1172: Definition fl.controls:Button could not be found. I created the button by making a simple shape converting it to a symbol (F8) of type 'Button'. In my FLA file i have this