General C++ Programming - C++ Forum

Hello, I was trying to update the data in a file for a dbms. Anyway, at some point, I had to change some content, say number of users, without changing anyth...

[1 reply] : Read the file to memory, modify, write back. If the files are too big... (by helios)

by renoraines

Overload operator << for a template-nested private class

I get this error: error C2785: 'std::ostream &operator <<(std::ostream &,const Outsider<T>::Nested &)' and '<Unknown>' have different return types W...

[4 replies] Last: Just move the implementations of the operator<< into the class at the ... (by jsmith)

by idojava

NO File, but still a buffer... how?

OK, my challenge is basically this - read a file from a SCSI device through the device manufacturers .dll (got that part, I think - using malloc into a byte arr...

[1 reply] : http://www.cplusplus.com/reference/iostream/istream/read/ Also, you... (by helios)

by killkolor

calling member functions on a boost::lambda pointer

Hi! I am trying to use lambda to this use: std::for_each( paBOBhErfolgAbgrenzung->begin(), paBOBhErfolgAbgrenzung->end(), _1->coutData()); where paBOBh...

[1 reply] : boost::bind( &YourObjectType::coutData, _1 ) will do the trick. ... (by jsmith)

by CrimsonAngel

Bin file io

so im working on this little file io project of mine and i made this: #include <iostream> #include <string> #include <fstream> #include "Queue.h" #incl...

[11 replies] Last: An array declared as array has 9 elements: [0..8]. (by helios)

by kolonel

Can't call OpenThread

Although i included windows.h in my project, i can call to OpenThread API. It said 'undeclared identifier'. I'm a bit mad mow, please help me.

[1 reply] : msdn says this: Minimum supported client Windows 2000 Professional ... (by writetonsharma)

by Incan

fstream, two dimensional arrays and spaces

Hello, I'm trying to get fstream to send words seperated by spaces (or tabs) into a two dimensional array (ie: one dimension for the word itself, one for distin...

[1 reply] : int main() { char chaine ; ifstream entree("dico.txt"); int i=0... (by writetonsharma)

by Tom Backton

Templates

Is it possible to put a class/function template definition in a header file and then include the file in the cpp files that use the template?

[3 replies] Last: OK, thanks :) (by Tom Backton)

by Tom Backton

Const functions and "using" classes

I have two unrelated questions: 1. Where do I put the const, in the declaration int MemberFunc() const; ) or in the definition int MyClass::MemberFunc(...

[8 replies] Last: You didn't answer the question about const (the answer is: both, decla... (by Tom Backton)

by wretch

almost identical derived class function signatures

This problem has come up for me in slightly more complicated form, I have created a contrived example to shorten the code. For a given base class, if all der...

[4 replies] Last: -- but once you have a good design, the programming part is soooooo e... (by wretch)

by whOOper

File I/O problems?

Hi, I'm trying to make a program to create, edit and delete text using a .txt format and the users default text editor. I want the user to be able to create a ...

[2 replies] Last: http://www.cplusplus.com/reference/clibrary/cstdio/remove/ (by Duthomhas)

by Return 0

Dynamic Stack Template

I have the following at this point: DynStack.h // Specification file for the DynIntStack class #ifndef DYNSTACK_H #define DYNSTACK_H template < clas...

[2 replies] Last: That did the trick. Thanks (by Return 0)

by chibolete

array compress

i need to do something like dirs in the pc. like C:\System\etc. using arrays or something else. thinked about: char ref ;//just the elements char ...

[4 replies] Last: Really thanks! (by chibolete)

by lotios

Passing a user supplied variable to a function

It is my first time posting here, so please bear with me. I have been trying to make a simple text-editor using the Command prompt. It glitches at line 15. The ...

[12 replies] Last: It still doesn't do what I want. Oh well, of to classes. (by lotios)

by vRltwE

Define a 3 dimensions vector

Hi, to create a matrix I do; vector<vector<double> > matrix( cols , vector<double>( lines ) ); Now I need to create a 3 dimensional vector, I tri...

[1 reply] : vector<vector<double> /* missing '>' here*/( lines )) But I'm not s... (by helios)

by noobers

All confused.

Ok , i just installed Visual Studio 2008. As i followed through some tutorials on how to write a console applications , i did the same. File --> New Project...

[8 replies] Last: Hey! Kbw , well , thanks for the prompt reply. But since many days i w... (by noobers)

by strawberry

singleton pattern basics, private static data member definition

This simple code should compile and link according to the gang-of-four and websites: class X { static int i; }; int X::i = 0; // definition outsid...

[2 replies] Last: Starting a new project and having the Console program setting helped. ... (by strawberry)

by kakashi316

randomizing

i have this code where i have to sort a random array into different sorts. the code being: #include<iostream> #include<iomanip> #include<cstdlib> using ...

[3 replies] Last: I'd have the functions take a pointer to the array. It's a bit easier ... (by closed account S6k9GNh0)

by aeronet

Threading error/questions

I'm trying to multi-thread a program i'm writing so it can accept user input while running a timer (so that if the user doesn't enter anything within a given ti...

[16 replies] Last: I tried Sleep(DWORD) and i get an error: expecting parameter before ) ... (by aeronet)

by hugsnbugs

console syntax

i have this code with me and i just typed it down in normal c++ syntax, well most of it.. and i want to convert it into the console syntax.. i dont have the sof...

[9 replies] Last: im sorry everyone.. didn't mean to sound as rude as i did...the work-l... (by hugsnbugs)

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General C++ Programming - April 2009