I'm having trouble debugging a segmentation fault. I'd appreciate tips on how to go about narrowing in on the problem. The error appears when an iterator tries to access an element of a struct Infection, defined as: struct Infection { public: explicit Infection( double it, double rt ) : infT( it ), recT( rt ) {} double infT; // in...
How do I go about opening a binary data file in Python and reading back the values one long at a time, into a struct. I have something like this at the moment but I think this will keep overwriting idList, I want to append to it, so I end up with a tuple of all the long values in the file - file = open(filename, "rb") try: ...
I have an array of structs called leaders. The struct class looks like this, for contextual info: class Leader < Struct.new(:rank, :user); end Two questions: How do I sort the array of structs by rank? How do I sort the array of structs by rank and by user.created_at? ...
The following function writes a struct to a file. #define PAGESIZE sizeof(BTPAGE) #define HEADERSIZE 2L int btwrite(short rrn, BTPAGE *page_ptr) { long addr; addr = (long) rrn * (long) PAGESIZE + HEADERSIZE; lseek(btfd, addr, 0); return (write(btfd, page_ptr, PAGESIZE)); } The following is...
Can a struct contain other structs? I would like to make a struct that holds an array of four other structs. Is this possible? What would the code look like? ...
typedef struct queue { int q[max]; int qhead; int qrear; } queue; void init_queue(queue *QUEUE) { QUEUE.qhead = 0; QUEUE.qrear = -1; } void enqueue(queue *QUEUE,int data) { QUEUE.qrear++; QUEUE.q[QUEUE.qrear] = data; } int process_queue(queue *QUEUE) { if(QUEUE.qhead > QUEUE.qrear) return -1; else return Q...
As part of answering another question, I came across a piece of code like this, which gcc compiles without complaint. typedef struct { struct xyz *z; } xyz; int main (void) { return 0; } This is the means I've always used to construct types that point to themselves (e.g., linked lists) but I've always thought you had to name t...
Hi, I need to provide a C static library to the client and need to be able to make a struct definition unavailable. On top of that I need to be able to execute code before the main at library initialization using a global variable. Here's my code: private.h #ifndef PRIVATE_H #define PRIVATE_H typedef struct TEST test; #endif pri...
I am trying to activate #pragma pack(push, 8) on ubuntu 10.4 (8.10 would also be nice), which uses gcc 4.4.3, but I can't get it to work. Is there something more that need to be done? There is not even a warning if I compile with -Wunknown-pragmas so gcc seems at least to acknowledge it as a known pragma. It would be nice to use the pa...
Hello everbody, as said above, I wrote a little Python script that reads WOFF files (my own free fonts), extracts the embedded TrueType font data tables and rewrites them into TrueType font files. Well, it should theoretically. :-) I read the specs (WOFF -- TrueType) and did everything as stated there. Here I posted a short overview of...
ive got a struct problem it returns: cd.h:15: error: two or more data types in declaration specifiers its probably something simple ... struct cd { char titel[32]; char artiest[32]; int speelduur; }; typedef struct cd CD; struct cdlijst{ CD *item; struct cdlijst *next; } ...
Hi, In the ARM ABI documentation I come across functions defined like: __value_in_regs struct bar foo(int a, int b) { ... } but GCC(4.3.3) doesn't allow it and all I could find are references to some RealView compiler. Is there any way of doing this from GCC? I have tried -freg-struct-return but it doesn't make a difference. As ...
Ive got a task in C to sort a struct by using qsort struct user { enum SEX{m, f} sex; char name[32]; char phonenr[32]; }; typedef struct user User; the users will be stored in a array of 25 elements but how do i sort them on something like name ? ...
Why do this: // If parameter cannot be cast to Point return false. TwoDPoint p = obj as TwoDPoint; if ((System.Object)p == null) { return false; } Instead of this: // If parameter cannot be cast to Point return false. TwoDPoint p = obj as TwoDPoint; if (p == null) { return false; ...
I always wanted to know what is the real thing difference of how the compiler see a pointer to a struct (in C suppose) and a struct itself. struct person p; struct person *pp; pp->age, I always imagine that the compiler does: "value of pp + offset of atribute "age" in the struct". But what it does with person.p? It would be almost th...
I am coding a breakout clone. I had one version in which I only had one level deep of structures. This version runs at 70 fps. For more clarity in the code I decided the code should have more abstractions and created more structs. Most of the times I have two two three level deep of structures. This version runs at 30 fps. Since there ...
In this article : http://publib.boulder.ibm.com/infocenter/macxhelp/v6v81/index.jsp?topic=/com.ibm.vacpp6m.doc/language/ref/clrc03defst.htm What's means the sentence "In C, a structure member may be of any type except "function returning T" (for some type T)" Thanks for all the answers! ...
Hello! Trying to understand why this doesn't work. I keep getting the following errors: left of '->nextNode' must point to class/struct/union/generic type (Also all the lines with a -> in the function new_math_struct) Header file #ifndef MSTRUCT_H #define MSTRUCT_H #define PLUS 0 #define MINUS 1 #define DIVIDE 2 #defi...
Ok i have a struct in my C++ program that is like this: struct thestruct { unsigned char var1; unsigned char var2; unsigned char var3[2]; unsigned char var4; unsigned char var5[8]; int var6; unsigned char var7[4]; }; When i use this struct, 3 random bytes get added before the "var6", if i delete "var5" it's still before "var6" ...
I am new to C++, and let's say I have two classes: Creature and Human: /* creature.h */ class Creature { private: public: struct emotion { /* All emotions are percentages */ char joy; char trust; char fear; char surprise; char sadness; char disgust; char anger; ...