C / C++ Forum

Hi all, I have a base class, call it Object, that implements operators new and delete. Now suppose there is also a class, call it Derived, deriving from Object. It has the feature that *all* its instances are statically allocated so I have to override new and delete. Since *all* instances are statically allocated (and already fully

I have a feeling this going to end up being something so stupid, but right now I'm confused as hell. I'm trying to code a function, that given a string and a delimiter char, returns a vector of the sub-strings. Here's what I have (I've thrown a main() in there for this mail). --- #include <iostream> #include <string>

B.S. page 271: class complex { double re, im; ... public: ... }; comlex::comple(complex c):re(c.re), im(c.im){} //error

I've a nasty problem here (g++ 3.4/4.0): I've a template datatype mltreenode<T> from which I instanced a STL vector vector< mltreenode<T> * > without any problems. Calling methods on this object (e.g. push_back()) doesn't cause any problems. But when I try to instanciate an iterator like this: vector< mltreenode<T> * >::iterator worst_elem;...

Hi C++ should provide us bit shift but fill with 1 rather than 0. Or i am wrong, c++ have it??? if 1 left shift 2, i want 111 rather than 100 thanks from Peter (cmk128@hotmail.com)

Considering this struct: typedef struct ServiceRecord { vector<string> service; vector<Date> date; } ServiceRecord; Date is declared elsewhere as:

How do you iterate through an array of structs? I tried something like this and it doesn't work (my compiler says "illegal operand"): struct foo f; for (i = 0; f; i++) { // Insert code here } -------------------

You know, all this furor over this book caused me to go look it up on Amazon. I've never read this book... but from what I can see from the legally available table of contents, excerpt, and index at Amazon, it looks more like a "Teach me newbie C" book than a "UNCOVER DEEP MYSTERIES OF C!!" sort of affair. I've got a better idea! Let's...

I would like to (and commonly do) define my variables in the most specific scope I can. For example... int foo(int a, int b, int c) { /* don't declare temp here if we can help it */ ... for (i = 0; i < max; i++) {

Hi, This is a design question. I have a class named "DataBuffer" that stores some data. After "DataBuffer" is created it can not be modified. All the methods of "DataBuffer" are const as data can not be modified after it was created. Up to here everything is fine. The problem is when I want to get clever with data storage. My program has...

Given a user defined class with a default constructor (let's call the class C), is there any semantic difference between C* c = new C; and C* c = new C(); ? I am thinking they are equivalent, as demonstrated by the program

Hello I use the following function to print out the time. But I wonder whether I can be more accurate like print out the microsecond Thanks a lot! void Print_time() { time_t now;

char *a="this is a string"; char a="this is a string"; first is a pointer while second is an array.Tell me more differences

Hi, I need to write out a 1d array of 2d arrays (the structures for each are custom, a 3d structure is defined but not suitable for my use for a number of reasons). Templated routines exist for writing out multi2d<T> and multi1d<T>, hence writing multi2d<multi1d<T>> is possible, although fails for some unknown reason. There is a...

Hi I am busy writing a program in CORBA.It is about a bank and it's accounts .I am doing this in CORBA.The client has to enter he's name and password.Then these details should be send to a function in the header file open(name,passw) which should greate a new account if the name is new else it should return a reference to the already greated...

Hi, I am trying to develop a dll with JNI using C++ with Visual studio 2005 and JDK1.6 beta2.0 I wanted to know if i should generate the dll with /MD option or /MT option. Also, i was reading in the internet about this and i came across something related to embedding maifest within the dll.. not sure how this whole thing works. i also...

hello friends, I have log of the system call called by the windows process. I want some good algorithm may be of neural network etc ...... to find pattern for the windows process , Kindly help me .

ok say I have a program that outputs RRYYPP GGBBPP YYRROO VVBBGG for example. How would I find a value in the array and have it output something like this:

we are working with functions andn I've declared the function at the top...but I'm not sure what to actually out in it. We have to flip the sentence backwards... like say I love cats. we need to output to the user: .stac evol I can anyone help me??

I have com across a program in which I should take 17 as a global constant. I have to take 17 inputs. for those inputs .. I have to find the number of even numbers entered the number of odd numbers entered the number of prime numbers entered smallest number among those 17 largest number among those 17 factorial of the smallest number

I am confused on this: When "new" fails, what happens? - throws bad_alloc - returns 0 I found many docs with first, many with second and one with both(!) cases. thanks!

Hi all, I've got some code which monitors a file by way of the kqueue/kevent mechanism but I'm having trouble getting it to shut down cleanly. My thread dedicated to the kqueue is basically a while-loop which blocks on the kevent() call until an event is posted, at which point it rattles through and does what it's supposed to. So far so...

Okay, so I can get this to read the first line of a txt document. I just can't figure out how to get it to read the next lines. I have to use "user_input" in a function. The wait function just waits until the user hits enter. The text document has 11 lines of code. I know this is a total newb question, but I am baffled. The function gets called at...

Hi, I apologize in advance if this is a very dumb question. I've been struggling with this problem for some time: I have an abstract base class called Base and n derived classes D1, D2, ....Dn. I would like to have a constructor for each derived class that takes any of the other derived classes as an argument so that these statements are...

Say we have a class Model (a 3d model) and class Texture (representing an Texture). Model have a texture, Model can be Drawed. Texture have method that returns data needed for drawing. class Texture { public: // openGl data here glInt GetInt();