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General C++ Programming - March 2010 (Page 19)

I was wondering if there was a way I could have a stream for logging output to stdout and a file. The idea would be that I could just do this: log << "Ev...

[13 replies] Last: I would say boost is almost standard. A lot of stuff from boost is get... (by tummychow)

by closed account Sy0XoG1T

vector of function pointers

I'm trying to do something like this... void testfunc() { cout << "hello" << endl; } int main() { vector<void*> testvec; testvec.push_back(&test...

[8 replies] Last: Ah alright. It wasn't working before with .at but now it is. :) Tha... (by closed account Sy0XoG1T)

by yoonkwun

[stdlib.h] free doesn't invalidate

Hi, when I was checking if my cleanup function was working, I noticed that I could use allocated data even after calling free. int main() { short *a...

[11 replies] Last: So you say that I should never check if malloc failed because I shoul... (by chrisname)

by pozdrav

operator overloading (1,2)

Hi, I am writing a "vector" class. I know about the STL but I prefer to use this as I use this to create a "matrix" class later. I read that using the inbuilt ...

[25 replies] Last: sure, thank you very much once again. (by pozdrav)

by Seraphimsan

breaking a 1D array into a 2D one

I've been struggling with this function for quite a while and it's starting to drive me insane, So I figured I'd go and ask the never ending supply of knowledge...

[2 replies] Last: thanks, yea thats what i meant on line 18...it's been 12 hours of star... (by Seraphimsan)

by diod31

ifstream syntax error in a class template constructor

These are my errors: line, error, default order, which file the error is in 16 error C2061: syntax error : identifier 'ifstream' 1 heap.h 07 error C2061:...

[1 reply] : Templates don't work that way. The most common use of templates is ... (by helios)

by pedr020

ifstream problem

This program is supposed to have user input name of imputfile,open the file which should contain a list of scores and store the list in an array,then do some ot...

[5 replies] Last: .data() doesn't necessarily give you the null (which you typically nee... (by Disch)

by tepeyton

Linking Error 2019

I am getting this error message when I compile my code. Build Output Message: 1>------ Build started: Project: matrixWK06, Configuration: Debug Win...

[7 replies] Last: I was able to resolve my problem. I had created the code as a WIN32 P... (by tepeyton)

by smeghead

Files trouble

I have some code that opens a file using a fuction to request the file name i then request and id that the user wants to look for in the file. if found should d...

[5 replies] Last: yes i open the file to read it then the user inputs a number to look f... (by smeghead)

by GrayKitten

Need answer by tonight! Switch Statement CAN NOT have breaks!

I'm needing to write a program that gives the user a menu to choose from. He or she enters a letter for the package they would like. I got the program working ...

[12 replies] Last: Fixed everything. Thank you all so much, you all are god sends. (by GrayKitten)

by Zap

output spacing

As a project for school I am doing a simple fraction calculater. However, I have decided to go a little further with it and have it reduce the fractions for me ...

[3 replies] Last: i have sort of come up with a solution. all i need is the syntax to fi... (by Zap)

by Disch

looking for design feedback: string class "substring"

So I'm working on a series of string classes which work with UTF encoded strings. I'm not working on the 'substring' functions and am a little torn as to the...

[2 replies] Last: I suppose it could if I really wanted to do that, but I'm not so sure ... (by Disch)

by tomob57

Read different types from a getline string

Hi all, What is the best way of reading in a line at a time from a file, and extracting a char followed by two doubles from it? Here is some context: In ...

[1 reply] : You'd probably be fine with extracting the char, then each number stra... (by tummychow)

by zerobus

Memory Allocation

Does the memory allocated by the new keyword in a function body get deallocated when the function goes out of scope? Or do I have to manually deallocate it w...

[1 reply] : Barring the use of auto/smart pointers, you need to associate every ca... (by closed account 1yR4jE8b)

by yoonkwun

[C] Pointer member in structure confusion

Hi, I have a typedef'd struct with a pointer member: typedef struct { int *i; } TEMP; I want to set the VALUE of this member: TEMP temp; *(t...

[10 replies] Last: Based on the code and thread title I assumed he was coding C. (by Disch)

by pedr020

file trouble

im having trouble opening a file,and checking to see if it was opend correctly..the user is supposded to enter the name of the file which contains a list of int...

[6 replies] Last: I think that, for a relative path, you need \input1.txt, not just inpu... (by tummychow)

by andrew12345

Reference and classes

Hi everybody, I just started programming with classes. Everything was fine until when I saw this expression: MyClass& operator= (const MyClass&); It was...

[4 replies] Last: Oh, I see...basically I always thought to * and & as referring to a va... (by andrew12345)

by jhapk

Not repeating the same operation

Hi, in a few functions I am doing the same operation, multiplying two static variables every time those functions are called, something like this: dou...

[2 replies] Last: Hi Disch, the value of alpha and beta remains constant for all Func... (by jhapk)

by byuhobbes

Char problems

I'm working on some data structures in C++ and I'm having trouble understanding some problems with the char * data type. I've worked with C++ before, but I've a...

[2 replies] Last: Most compilers do not allow variable length arrays because it is non-s... (by jsmith)

by shivlakhanpatel

How can I call Constant Functions?

Hello All; I have two files: 1. ConstantConcept.cpp 2. ConstantConcept.h 1. ConstantConcept.cpp: #include <cstdlib> #include <iostream> #include...

[5 replies] Last: Additionally, the get_name method could be more suitably named set_nam... (by moorecm)

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