C / C++ Forum

When you have a constant integral in a program, like the population of a town, how do you declare it? A const variable or an enum? Up until now I've always used variables, e.g.: unsigned const population_dublin = 8274816; I'm flipping through pages of Bjarne's book though at the moment, and enum's seem pretty handy, as in:

I'm having difficulty with overloading ==, and it's making my brain melt - can you help...? What I want to have is: 1) A base class A with virtual operator== defined (no problem) 2) A class B derived from A with operator== overridden (again, no problem) 3) Pointers A* b1, b2 which may actually point to instances of B, where I can call...

Hi there, I got a tough interview questions lately, and I would like to hear your opinion: An array of N chars is given Write an efficient algorithm to find all the repeating substring with a minimal size

For example, int i = 5; int &r = i; Are i and r two different variables? Or do i and r occupy the same memory space? that means they are the same variable? Thanks.

Years ago we used to produce production flow diagrams using a C to flow diagram tool. So much better than "drawing" in our environment. I can't remember the name of it. C First? Any old C programmers around that remember this product? Is there a code to flow product out there now?

What are the benefits of using const functions? How does the compiler interpret const functions? Thanks, Denis

Hi there, Whats more efficient and why .... int func(int x) { return x*2; } or

hi all , I am new to C++ programming. Can some body explain reason for this compilation error, .../inc/polecache.h", line 339: error #2322: object of abstract class type "CPoleCache::CCacheViewImpl" is not allowed:

Hi, I'm using the boost library program_options for parsing the command line given to my program as described in the class Parameter: // Main.cpp #include "Parameter.h" using namespace std; int main(int ac, char* av)

I have a base class which has a protected member: map<mstring,mstring> mstring is a derived class from std::string, which includes some functionality to cope with MFC. It works fine in the base class, but when I try to use it in a derived class, it gives me an error message. C:\Program Files\Microsoft Visual Studio .NET...

Hi, I encountered a problem when compiling multiple files with make file on solaris. The program uses a thrid party library file(.a) and when linking it to the program with -l option i get a error stating: ld: elf error: file library.a(lib_obj.o): elf_strptr: Request error: no string table ld: elf error: file library.a: elf_begin: Format...

how apply design patterns to c ?

Dear All, I have file like: $ ----------------------- $ file management section $ ----------------------- $ ------------------------- $ executive control section $ -------------------------

Does anyone know of a port of getopt and getopt_long for Windows, especially one that compiles and links with VC++?

Previous posts (and compilers) confirm that class X { friend void Y() ; } ; does not match namespace

Hello, I'm starting to spam this group..I need a function that is equal to this function in JAVA: System.currentTimeMillis(); that returns the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC. (output is like this: 1141375007171 )

Following small test-program (see below) compiles fine with multiple versionS of gcc, icc, xlC, aCC, pathscale but not with the PGI compiler. The PGI 6.1 compiler tells me following: <error> "test.cpp", line 12: error: more than one operator "<<" matches these operands: function "std::operator<<(std::basic_ostream<char,...

Dear comp.lang.c++, I'm interested in knowing the general techniques used to handle large binary files (>10GB) efficiently such as tweaking with filebuf , etc. Reading chunk by chunk seems to be popular choice even though it complicates the algorithm implementation. I am interested in knowing when & what to apply in frequently encoutered...

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Hi all ,i need algorithm and source code for Minimum spanning tree(MST) please tell me algorithm and code for it

Hi friend, I am in deep trouble, I need to change the string in following format " 1.55576+2" in the floating point notation. that is i should have 155.576 as my output. Please suggest some efficient way. Looking forward to get good solution to my problem. Raj

Is static constructor available in C++? Can anybody explain me about private and static constructors in c++ Rgds, Mani

what is the ((((return any no;))) in the main mean plz Ex. int main() { ; ; ; return ??;

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Hello- Ive never used a vector or vectors in C++ so I have a question for you all. I know I can dynamically create the size I need upfront, but is it possible to create them on the fly dynamically? That is, for a 2 dim array, I want to create the first element and then push_back the columns after that: