Similar to: Why are RTOS only coded in C, but: Besides the numerous myths about C++, why is it not used as much as C/nesC (TinyOS) for WSN? Knowing C++ can be used for Simulating Wireless Sensor Networks with OMNeT++ it is hard not to think that it can also be used in real-time embedded systems as C is to accomplish event handling. I ...
How can I convert microseconds to milliseconds and make it possible to compare timestamps by substraction? Example: int t1 = (int)timeGetTime(); int t2 = (int)timeGetTime()+40; // now t1 - t2 < 0 which means that t1 < t2. This logic won't work if you divide time values by 1000, to convert microseconds to milliseconds. ...
I have an (for C++ programmers better than me) simple problem with classes and pointers. I thought about posting example code describing my problem but I found it easier to just explain it in words. Assuming I have three classes: Class A: The main class - it contains an instance of both B and C. Class B: This class contains a method t...
I have a tree_node class and a tree class. template<typename T> class tree_node { public: tree_node(const std::string& key_, const T& value_) : key(key_), value(value_) { } private: T value; std::string key; }; template<typename T> class tree { public: tree() : root(new tree_node<T>("", ???)) { } private: ...
if( system("tail -500 log.txt") == -1) { //Error calling tail.exe on log //errno is a system macro that expands int returning //the last error. strerror() converts the error to it's //corresponding error message. printf("Error calling tail.exe with system(): %s",strerror( errno )); } System() is c...
I was using the system timer (clock() function, see time.h) to time some serial and USB comms. All I needed was approx 1ms accurace. The first thing I noticed is that individual times can be out (plus or minus) 10ms. Timing a number of smaller events led to less accurate timing as events went by. Aggregate timing was slightly better. Aft...
I am able to re-order my list box items using a mouse. I am only using one listbox. The dialog has few combo boxes and other stuff too, so listbox is a child control of that Dialog.For example I can drag and drop or move item5 to the 2nd position in the list or anywhere using my mouse. However when I do that, I want my grid to get update...
After a lot of investigations with valgrind, I've made the conclusion that std::vector makes a copy of an object you want to push_back. Is that really true ? A vector cannot keep a reference or a pointer of an object without a copy ?! Thanks ...
Hey, I'm using QT with opengl to make a chart in order to use it in different simulated physical experiments, but I'm facing the following problem. I can't see my chart line unless I minimized my form window and then maximized it, and I should do that all the time as long as my line chart is being drawn in order to get the full result!! ...
Possible Duplicates: C++: How to split a string? Splitting a string What is the best way to go about splitting a string up by whitespace in c++? I'd like to be able to split it based on tab, space, etc. and of course ignore multiple tabs/spaces/etc. in a row as well as not have issues with having those things at the end. U...
Hi, I plan to use MPI for my C++ code. I have installed MPICH2 on my computers. But I do not know much about MPI and hope to find some materials to read. I hope you experts can recommend some good materails to me. Any advice will be appreciated. ...
New Programmer here. Trying space invaders. I have a 2 dimensional array of objects stored in a one dimensional array (using modulo to determine rows and columns). Each object will return its boundaries in graphical space. I need to determine the boundaries (top, bottom, left, right) of the whole array for collision detection. I feel l...
Hi, I'm using VS 2008 on a 64-bit XP machine. I'm debugging a 32-bit C++ DLL via a console program. The DLL and EXE projects are contained in the same SLN so that I can modify the DLL as I test. What happens is that every once in a while I kill the program with Debug | Stop Debugging (Shift-F5). VS stops the program, but the console win...
Hay Dear! I have problem in implementing disjoint set ADT in c++ due to the fact that our teacher only explained the union and find operations. I have full concept of union and find but still I am confused about how to implement. Please give me an idea , also explain what should be the interface of this data structure. Explain this data...
Given the initialized variables unsigned a, unsigned b with b > a and std::vector<std::string> strings of size b-a. How can I fill strings with the elements e.g. "x3" "x4" "x5" "x6" (in case a=3 and b=7) for arbitrary a and b with one C++ command (meaning one semicolon at all :))? ...
I'm having issues with Doxygen recognizing namespaces and modules. I believe the issue surrounds whether to place the \addtogroup within the namespace or outside the namespace. Example 1, outside the namespace: /*! * \addtogroup Records * @{ */ //! Generic record interfaces and implementations namespace Records { //! Describe...
Observation: the codes pasted below were tested only with GCC 4.4.1, and I'm only interested in them working with GCC. Hello, It wasn't for just a few times that I stumbled into an object construction statement that I didn't understand, and it was only today that I noticed what ambiguity was being introduced by it. I'll explain how to ...
in dirA/SConscript I have: Import('env') probeenv = env.Clone() probeenv['CXXFLAGS'] += ['-fno-rtti','-Wnon-virtual-dtor'] ... stuff that uses probeenv in dirB/SConscript I have Import('env') sipenv = env.Clone() ... stuff that uses sipenv Now, c++ files in dirB that gets compiled, gets the CXXFLAGS from dirA - how come ? This doe...
I made a small program with Boost in Linux 2 yrs ago. Now I want to make it work in Windows. I found there are few .a files in my libs folder. I am wondering how to make it works in Windows? do I need to build Boost in Windows to get library or I can download somewhere? I am using Visual Studio 6. ...
Hello I was reading today question on IDEs fo C++, and there are very good ones like Netbeans. My question is about creating a software in C++ on Windows Environment, but let users install and run my software also on Linux and OSX. Does netbeans has a compiler to do the job, or is there any good IDE which has a compiler for targeting...