I want to insert n elements into a map where n is known ahead of time. I do not want memory allocation at each insertion. I want all memory allocation at the beginning. Is there a way to do this? If so, how? Will writing some sort of memory allocator help? I ran GMan's code and got the following output. GetMem is printed from a call to ...
Is there any difference between a variable declared as static outside any function between C and C++. I read that static means file scope and the variables will not be accessible outside the file. I also read that in C, global variables are static . So does that mean that global variables in C can not be accessed in another file? ...
In the following C++ code, it should be impossible for ain integer division by zero to occur: // gradedUnits and totalGrades are both of type int if (gradedUnits == 0) { return 0; } else { return totalGrades/gradedUnits; //call stack points to this line } however Visual Studio is popping up this error: Unhandled exception ...
Hi all, I'm writing some callback implementation in C++. I have an abstract callback class, let's say: /** Abstract callback class. */ class callback { public: /** Executes the callback. */ void call() { do_call(); }; protected: /** Callback call implementation specific to derived callback. */ virtual void do_call(...
One of our users having an Exception on our product startup. She has sent us the following error message from Windows: Problem Event Name: APPCRASH Application Name: program.exe Application Version: 1.0.0.1 Application Timestamp: 4ba62004 ...
i have been reading about multiple inheritance http://stackoverflow.com/questions/225929/what-is-the-exact-problem-with-multiple-inheritance http://en.wikipedia.org/wiki/Diamond_problem http://en.wikipedia.org/wiki/Virtual_inheritance http://en.wikipedia.org/wiki/Multiple_inheritance But since the code does not compile until th...
Hi, in a C++ program, there is a point when it reads a string like: "NONAME_1_1\r" the \r is causing me trouble. I guess it prints or adds something like "^M". Is it right? Anyway it casues me problem, and I want to get rid of it. I can not modify the input. I wonder how could I at this point, using C++, and in the easiest way, to r...
Could someone provide c++ tutorials/reference/books about PSAPI ? also Did someone know if there are a wrapper to this library on perl? ...
Consider there is a QTablWidget and a QTextEdit. Both of them are in a horisontal QSplitte. Let the QTable widget has 2 columns. The problem is to resize the table columns' width as you do resize operation by moving the splitter with mouse. Are there any options to may colums to be resized synchornosly with the table? Thanks. ...
std::string x(x); This crashes very badly on my compiler. Does this mean I should test for this != &that in my own copy constructors, or can I assume that no client will ever be so stupid? ...
Hi! I would like to send pictures via a program written in C + +. - OK It works, but I would like to send the pictures from pre-loaded carrier to a variable char (you know what I mean? First off, I load the pictures into a variable and then send the variable), cause now I have to specify the path of the picture on a disk. I wanted to w...
How to display vtable using a pointer to base class object having virtual functions? ...
Hello everybody. Lately, I've been trying to learn C++ from this website. Unfortunately whenever I try to run one of the code samples, I see that program open for about a half second and then immediately close. Is there any way to stop the program from closing immediately so that I can see the fruits of my effort? Thanks in advance. ...
Hello, I have compiled several libraries with MingW/MSYS... the generated static libraries are always .a files. When I try to link the library with a MSVC project, Visual Studio throws 'unresolved external symbols' ... It means that the .a static library is incompatible with MS C++ Linker. I presume it has to be converted to a MSVC comp...
Update: OK I see it's a bubble sort, but is it less efficient because it doesn't stop when there's no swap on a particular run? It runs until first is null. Hi, I have a sorting algorithm as follows. My question is, which sorting algorithm is this? I thought it was bubble sort, but it does not do multiple runs. Any idea? Thanks! //sort...
I know that this book is for C++ Primer 3rd Edition (Stanley Lippmann) but can this be used for C++ Primer 4th Edition. There is no C++ Primer answer book for the 4th Edition. Still comtemplating if i should get it. ...
I want to write to a file without overwriting anything. It is a text file containing records. When I delete a specific record, I do not actually remove it from the file, I just put information in the header saying that it is deleted. How can I do this? ...
I have this function: void ToUpper(char * S) { while (*S!=0) { *S=(*S >= 'a' && *S <= 'z')?(*S-'a'+'A'):*S; S++; } } What does it mean for *S != 0, should it be null instead? ...
I want to make modifications to the middle of a text file using c++, without altering the rest of the file. How can I do that? ...
Is it even possible to create an array of bits with more than 100000000 elements? If it is, how would I go about doing this? I know that for a char array I can do this: char* array; array = (char*)malloc(100000000 * sizeof(char)); If I was to declare the array by char array[100000000] then I would get a segmentation fault, since the m...