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  • Is it worth setting pointers to NULL in a destructor?

    - by Rob
    Imagine I have a class that allocates memory (forget about smart pointers for now): class Foo { public: Foo() : bar(new Bar) { } ~Foo() { delete bar; } void doSomething() { bar->doSomething(); } private: Bar* bar; }; As well as deleting the objects in the destructor is it also worth setting them to NULL? I'm assuming that setting the pointer to NULL in the destructor of the example above is a waste of time.

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  • Weird initialization in C

    - by pacopepe
    Hi there, I have this piece of code and i don't know how it works #include <stdio.h> int main(void) { int numero = ({const int i = 10; i+10;}); printf("%d\n", numero); // Prints 20 return 0; } Why if i delete the second part (i+10;), the compiler gets an error? Why are the brackets necessary? Thank you ^^!

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  • c++ : looking away to implemnt this senario

    - by user63898
    Hi im looking to find how to implement this scenario: i have logic code that is inside function, now i like to be able to execute this function in a separate thread. now what i have is a raw implementation of this .. i simple Init the Thread that in its Start/Run method i keep the function logic . how can i make it more generic ? so i could send the function ( mybe function pointer ) to generic thread factory/pool ? in c++

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  • Create folder for todays date

    - by Ram
    Hi, I have a folder named as 2010. In this I want a folder for each month like "Jan10", "Feb10"....."Dec10" In each month folder I want to create folder for "Todays date" I have create a shortcut for that 2010 folder with Target as C:\WINDOWS\explorer.exe /n, /e, /select, F:\2010 I want a functionality that will execute when I click the shortcut for f:\2010 icon. Any pointer would be great help.

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  • How to compare two vectors, in C++

    - by Vincenzo
    This is my code: #include <algorithm> void f() { int[] a = {1, 2, 3, 4}; int[] b = {1, 2, 100, 101}; // I want to do something like this: // int* found = compare(a[0], a[3], b[0]); // in order to get a pointer to a[2] } Maybe I missed this algorithm in the manual… Please help :)

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  • Access element of pointed std::vector

    - by user146780
    I have a function where I provide a pointer to a std::vector. I want to make x = to vector[element] but i'm getting compiler errors. I'm doing: void Function(std::vector<int> *input) { int a; a = *input[0]; } What is the right way to do this? Thanks

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  • Interpreter more strict

    - by pacopepe
    Hi, Today, i lost a lot of time fixing a stupid error in my code. Very simplified, the problem was this: def f(): return 2 2 == f I forgot to write the parenthesis in the sentence, so I compared a pointer function with a number. Ok, my question: Is there any way to change the interpreter to be more stricted with the code? Show more warnings for example... Thanks ^^

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  • p=malloc()!=null.......

    - by gcc
    char *p,*p1,*p2,*p3,*p4; for(;;) { if((p=malloc(10))!=NULL && (p1=malloc(20))!=NULL ......) break; } Writing if(........) is too boring and long, are there any ways to make it simpler?

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  • Is objective C 2.0 a proper superset of C?

    - by RankWeis
    I've heard that objective-C is a proper superset of C, but is objective-C 2.0? The reason I ask is that either it isn't, or I misunderstand the phrase 'proper superset', because this code is valid C syntax: import int main () { char *nil = "hello"; printf("%s\n",nil); } But does not compile in Objective-C 2.0. Obviously, this is an easily fixable problem, but I'm writing a paper, and feel that this is something that should be pointed out.

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  • Looking for some help working with premultiplied alpha

    - by user315142
    I am trying to update a source image with the contents of multiple destination images. From what I can tell using premultiplied alpha is the way to go with this, but I think I am doing something wrong (function below). the image I am starting with is initialized with all ARGB values set to 0. When I run the function once the resulting image looks great, but when I start compositing on any others all the pixels that have alpha information get really messed up. Does anyone know if I am doing something glaringly wrong or if there is something extra I need to do to modify the color values? void CompositeImage(unsigned char *src, unsigned char *dest, int srcW, int srcH){ int w = srcW; int h = srcH; int px0; int px1; int px2; int px3; int inverseAlpha; int r; int g; int b; int a; int y; int x; for (y = 0; y < h; y++) { for (x= 0; x< w*4; x+=4) { // pixel number px0 = (y*w*4) + x; px1 = (y*w*4) + (x+1); px2 = (y*w*4) + (x+2); px3 = (y*w*4) + (x+3); inverseAlpha = 1 - src[px3]; // create new values r = src[px0] + inverseAlpha * dest[px0]; g = src[px1] + inverseAlpha * dest[px1]; b = src[px2] + inverseAlpha * dest[px2]; a = src[px3] + inverseAlpha * dest[px3]; // update destination image dest[px0] = r; dest[px1] = g; dest[px2] = b; dest[px3] = a; } } }

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  • Remove button box

    - by stdio
    I'm writing an application in C and I've a GtkLinkButton that contains a GtkStockItem. How can I remove the button box that appears when mouse pointer is on and when I click it?

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  • make it simpliest

    - by gcc
    input 000 000 000 000 255 000 000 000 000 000 000 000 purpose instead of 000 write 0 and 255 write 2 take input { char A[800][600]; scanf("%d",&height); for(i=0;i<height;++i) scanf("%s",A[i]); then what output 0 0 0 0 2 0 0 0 0 0 0 0

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  • [gtk+] error: undeclared function

    - by sterh
    Hello, In my gtk+ application i have function in mainwin.c: void on_prev( GtkWidget* btn, MainWin* mw ) { ... } And in file ui.h i have: #include "mainwin.h" static const GtkActionEntry entries[] = { { "Go Back", GTK_STOCK_GO_BACK, "Go Back", "<control>b", "Go Back", G_CALLBACK(on_prev) }, } But when i try to compile this application, i see error: ui.h:error: 'on_prev' undeclared here (not in a function). What's wrong? Thank you.

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  • convert &uuml; to u

    - by Remus Rigo
    hi all I'm using a database that contains contacts (fields like name, address, ...). If i'm using in my database a city that contains special chars (like ü) or html codes (like &uuml;), then how can i convert them to u, so when i search for a city that contains that a special char should be shown in the result...

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  • exceptions in C++

    - by helloWorld
    I have some techniacal question, in this function: string report() const { if(list.begin() == list.end()){ throw "not good"; } //do something } if I throw exception what is going on with the program? Will my function terminate or it will run further? if it terminates, what value will it return?

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