C / C++ Forum

I have the following: int *array = new int; and I destroy it with: delete array;

For Example, If I delete two times like the below code, the program will behave differently. is this correct? As C++ FAQ the delete checks where or not f1 has memory. How can the following program can go wrong? class foo{ // }; int main{ foo *f1 = new foo()

Java has packages (libraries) for everything. EVERYTHING. Instead, C++ is too poor in its classes. Is there a concept to extend C++ with other standard libraries, about multithreading, socket programming etc? I do not speak about libraries programmed only in one platform (e.g. MFC) but about standard C++ libraries.

Hi all, I have an application with a GUI in Tcl/Tk (running on AIX /Linux) and I need to make it running (porting) in Windows 2000. I would like to have some suggestion about this. What IDE should I use to recreate the GUI, is VisualC++ good enough? Or may be the Tcl/Tk could be compatible for Microsoft VisualC++, just some modification...

Hi all I have a bit of a problem, the subject of this post is almost selfexplaing. But here goes: Heres an example of the code I want to implement, its all nice and simple, but the flaw is I can't seem to get the adress of the member function stated properly in the DialogBox function. I thought it was enough to write it as Dialog::DlgProc,...

.... making things like #endif // of the "#ifdef DEBUG" part valid? Or not? - J.

Hello, few days ago I asked how to grant firend status to template. Thanks to Rob Williscroft for his help. Now I have run into problems while using class derived from the class created by the template. I'll try to give part of code leaving out unnecesarry things. ---- base ---- template <typename T> class ptr_t;

I was wondering if anyone could compile this code for me on VC. The problem that I've run into is that VC++6 does not support templates fully, and so, I cannot get this to compile, which relies heavily on templates. So, if someone can compile the explicit specialication for me with VC++7, and then I could try to use it in VC++6 (probably),...

Can we have private constructors and destructors? IF yes what is the use of such constructors or destructors.....in the sense where can these be implemented in a system................. I have an idea that we can have private constructors and destructors but am not able to find a situation where they can be used... Regards RVG...

I am new to programming in the C / C++ language and I am using a mixture of online materials plus a small collection of C and C++ books. What I basically want to know is how do I know if something I am learning is from the C Language or the C++ Language and should I avoid mixing the two. I am under the impression that C++ is the successor...

Hi, If I have something like this: CMyClass* p1; CMyClass* p2; I know I can do: p1 = new CMyClass(); p2 = p1;

Another smart pointer problem. I have a tree structure. The idea is for parents to have SmartPtr's to the children, with children holding a weak pointer (WeakPtr) back to the parent. That's great, but how do I implement the link from child to parent? Here's where the problem occurs: SmartPtr<ContainerNode> ContainerNode ::...

hi, i've some troubles compiling Bjarne Strostrup's Matrix class example http://www.research.att.com/~bs/matrix.c under ms visual c++ 6.0 (sp4). i get a lot off errors like matrix_klasse_by_stroustup.cxx(37) : error C2143: Syntaxfehler : Missing ';' before '<'

I'm trying to make a stream buffer which reads from a socket and it works fine in visual stuiod, borland 5.5.x and g++ 3.2.x but I get an infinite loop in g++ 3.0.4! I imagine it's somehow my fault though :) So I have implemented overflow, xsputn, underflow, uflow, pbackfail and xsgetn. I haven't made any buffers as I just want it to...

How do you check whether an std::string object contains only printable characters ?

Dear functional programing comrades, Among the community of automatons of the IT industry, there is a popular quote about "theory vs practice" that goes something along the lines of "in theory this, but in practice that", which is often quoted by automatons to slight at computer science principles or practice. (especially by perl or unix...

Hello I need (at work) to create any type of movies, i have set of frames, but i don't know how to use them to create a movie. Peter Tawdross

How do you check whether an std::string object contains only printable characters ?

I just want to hear people's opinions on this subject. My application has lots and lots of short-lived objects that use dynamic allocation/deallocation. After implementing its functionality, I found out that much processing is spent for new/delete calls. So, to improve its performance, I made a little factory-like class that pre-'new's...

Hi I am new to C++ ,i really dont understand why there is a need for VTable and can some experts give an example where exactly and how a compiler uses it Regards Pani

Can anybody help to trace the runtime error for the following code about sub-Linked list. Thank you, # include <stdio.h> # include <stdlib.h> typedef char *CategoryType;

I have installed GNU C/C++ on my Linux and tried to compile my first helloworld program. I tried this with the command: cc helloworld.cpp -c -o helloworld.o && ld helloworld.o -lstdc++ -o helloworld And got the Error: ld: warning: cannot find entry symbol _start; defaulting to 08048380

Can you please help me with this problem: I want my program, put a number of "int" data in a vector, after reading them from another file. Probably i should use "push_back" property...but i need to know the exact syntax for this case... Thanks Sh.

Hi, class A { public: virtual void x(){cout<<"inside A"<<endl;}; } class B : public A {

I have a fixed array of vectors like: vector<string> a_vStr; Then I grow each vector item and use it later. Everything works fine but I am curious about following potential problem. When we grow a vector it may copy all of its elements to different memory location to accomodate the new vector size. Is it possible that at some point an...