I'm preparing for an interview in a few weeks and I thougth I would give threads in boost a go, as well as do the simple producer/consumer problem I learned in school. Haven't done it quite awhile so I was curious what you guys think of this? What should I add to make it a better example etc. Thanks for the feedback! :) ///////////////...
In C++ I need string representations of integers with leading zeroes, where the representation has 8 digits and no more than 8 digits, truncating digits on the right side if necessary. I thought I could do this using just ostringstream and iomanip.setw(), like this: int num_1 = 3000; ostringstream out_target; out_target << setw(8) << ...
Hello. I have made a C++ library and have built a .dylib dynamic library from it. However when I load it with ctypes, it fails. Something doesn't seem to have linked properly. I have no idea why. The error (The relevant part): cscalelib.setup_framebuffer(flip,surface.frame_buffer,surface.texture,surface._scale[0],surface._scale[1])...
I'v followed a tutorial to use OGL tesselaton. In one of the callbacks there is a malloc and it creates a leak every time I render a new frame. void CALLBACK combineCallback(GLdouble coords[3], GLdouble *vertex_data[4], GLfloat weight[4], GLdouble **dataOut) { GLdouble *vertex; vertex = (GLdouble *...
Hi, I'm trying to port _controlfp( _CW_DEFAULT, 0xffffffff ); from WIN32 to Mac OS X / Intel. I have absolutely no idea how to port this instruction... And you? Thanks! ...
If I declare a function like this: string hash (char* key) then any change I make to key will also change it's value when the function exits, correct? I want to make a copy of it in the function so that I can safely change it without changing the original value. I tried this, but it doesn't work. char temp = key; How can it be do...
I have a performance issue where I suspect one standard C library function is taking too long and causing my entire system (suite of processes) to basically "hiccup". Sure enough if I comment out the library function call, the hiccup goes away. This prompted me to investigate what standard methods there are to prove this type of thing? W...
Hi, I was looking at the boost serialization library, and the intrusive way to provide support for serialization is to define a member function with signature (simplifying): class ToBeSerialized { public: //Define this to support serialization //Notice not virtual function! template<class Archive> void serialize(Archiv...
Hello, Since I'm not familiar with iPhone development I'd like to know whether it is possible to use OpenGL ES1.0 on the iPhone 3gs rather than 2.0. I'd like to share a code base across different mobile platforms and not having to deal with the programmable pipeline from OGLES 2.0 could speed up an initial build. Update -- I'm not us...
When writing C++ code is there any difference between: #include <cstdlib> and #include <stdlib.h> other than the former being mostly contained within the std:: namespace? Is there any reason other than coding standards and style to use one over the other? ...
I have a custom application in C++ that has been used to successfully copy-and-paste an object from the application into MS Office 2003 and 2007 (Word, Excel and PowerPoint). The object opens in our own custom ActiveX control. Now with Windows XP and PowerPoint 2010, nothing happens on the cut-and-paste. I have tried turning off the sma...
Hi, I have an array of (4) floating point numbers and need to sort the array in descending order. I'm quite new to c++, and was wondering what would be the best way to do this? Thanks. ...
I am trying to find an error in my code. The problem is the error occurs in a loop. But the loop iterates about 500 times. Instead of clicking through the loop. Is it possible to skip over a certain amount of the loop ?? ...
Hello. My task was as follows : Create class Person with char*name and int age. Implement contructor using dynamic allocation of memory for variables, destructor, function init and friend function show. Then transform this class to header and cpp file and implement in other program. Ok so here's my Person class : #include <iostream> usi...
Hello Everyone, I'm fairly new to Qt, and I'm using the new Nokia Qt SDK beta and I'm working to develop a small application for my Nokia N900 in my free time. Fortunately, I was able to set up everything correctly, and also to run my app on the device. I've learned C++ in school, so I thought it won't be so difficult. I use Qt Creator...
Hi everybody: I am writing a C++ application that needs to execute SQL queries in a SQL Server DB and I want to do it using SQL Server Native Client. The MSDN documentation has no a full reference on it and has a few examples so I am looking for some site having more information on how to connect, execute queries and retrieve results u...
I'v tried to solve a memory leak in the GLU callback by creating a global variable but now it dos not draw anything: GLdouble *gluptr = NULL; void CALLBACK combineCallback(GLdouble coords[3], GLdouble *vertex_data[4], GLfloat weight[4], GLdouble **dataOut) { GLdouble *vertex; if(gluptr == NULL) ...
We are adding AES 256 bit encryption to our server and client applications for encrypting the TCP/IP traffic containing sensitive information. We will be rotating the keys daily. Because of that, the keys will be stored in memory with the applications. Key distribution process: Each server and client will have a list of initial Key E...
I'm using C++ to recursively make a hexagonal grid (using a multiply linked list style). I've got it set up to create neighboring tiles easily, but because I'm doing it recursively, I can only really create all 6 neighbors for a given tile. Obviously, this is causing duplicate tiles to be created and I'm trying to get rid of them in some...
I wish to have two threads. The first thread1 occasionally calls the following pseudo function: void waitForThread2() { if (thread2 is not idle) { return; } notifyThread2IamReady(); // i.e. via 1st condition variable Wait for thread2 to finish exclusive access. // i.e. via 2nd condition variable. } The second thread2 is f...