C / C++ Forum

Due to performance reasons--code size, real-time accuracy, and power consumption--many embedded SW engineers traditionally develop embedded products in assembly languages. However, thanks to the higher CPU capacity and lower CPU unit price, more embedded products are being written in C and some in EC++ or EJava. I seem to recall the latest...

Is it possible to use vector<ostringstream> ? Here is what I have got. =========================================== Windows 2000 CYGWIN_NT-5.0 1.3.22(0.78/3/2) GNU gcc version 3.2 20020927 (prerelease) ===========================================

Recently tried to make a vector of a classe that contained a pure virtual member. It didn't work. I've since found a little bit of information including one possible solution: http://pages.cpsc.ucalgary.ca/~kremer/STL/1024x768/ref2.html However the author mentions that the solution provided is not very efficient. Was wondering if...

Hi guys i have a piece of code main() { switch(...) { case 1: {

Hi all Been learning C++ for about 5 weeks. I find that I create quite a lot of variables. Generally, is it better to create a new variable for every different thing that needs to be stored in the program? Or would you reuse variables in the code... like declare an 'int i', and use it in loops, storing temp values, storing main variables...

Hi all! I'm trying to create a DLL in C++ that calls an EXE containing a COM component. I load the component and call to it's methods using the IDispatch interface, it works correctly until I try to call a method with the signature: method(long, BSTR, VARIANT*)

class A { public: int a; }; struct testfun1 : public unary_function<const A&, bool> { bool operator()(const A &) const {

I'd like to overload 'comma' to define a concatenation operator for integer-like classes. I've got some first ideas, but I'd appreciate a sanity check. The concatenation operator needs to so something like this: 1) e = (a, b, c, d); // concatenate a,b,c,d into e 2) (a, b, c, d) = e; // get the bits of e into a,b,c, and d For example,...

I've just converted from gcc2.96 to gcc3.3. One of the things that 3.3 complained about was my use of functions which had default arguments. Previously, I put the defaults in my function definition, and then copied the definition directly as the declaration: void A::foo(int a, int b=0); // declare somewhere void A::foo(int a, int b=0)...

Sorry, don't have a copy of the standard handy anywhere. Given this: // header class Test { public: Test() {} ~Test() {}

$ cat main.c extern void asm_exit(int); int main(int argc,char *argv) { asm_exit(0); } $ cat asm_exit.asm ; exit() by assembly: void asm_exit(int status) ; assemble: nasm -f elf asm_exit.asm

Hi, I have following questions. 1. Does va_arg allow one to read user defined types. My compiler allows but I am wondering whether it is true for all. 2. I wrote the following code. Pardon my omitting declarations etc.. int main() { func(10, "baaaaa");

I was wondering if anyone could recommend some good beginner sites and tutorial sites for writting ASP.Net pages in C#. Things that especially help with datagrids!! And perhaps a newsgroup that really focusses on C# and ASP.Net? That is, if not this one? Thanks!! Liam

Is it possible to use C or C++ to create web pages? Ouputting text with HTML syntax is easy enough, but how do I make a web browser see the generated text?

I'm looking for a good decrypt/encrypt function, all I want is a function in this form: char* encrypt(char* normal) { ... return encrypted; } and

I'm trying to write a class for a smart pointer. I'm having a problem though when trying to implement operator== with both sides being a Smart. (Or any function that I try to bring U into.) The pointer contained might not be the exact same type but still get tested for equality. Here's what I have: template <typename T> class Smart; ...

Such as in a.h, I need put #include "b.h", while in b.h, I need put #include "a.h", but it does not work! Any alternative way to do it?

Hey there, I need to get some help with very basic C++ strings (they syntax of them in c++ and such). I need to define a string of characters that will be input. And how do I input the difference between uppercase and lowercase letters? Thanks

Okay, here's a question about the standard. What does it say about unsigned/signed mismatches in a comparison statement: char a = 3; unsigned char b = 255; if (a<b) Now what's the real answer here? If a is converted to unsigned, then b>a. But, if b is converted to signed,then a>b. What's the correct coversion (what is the compiler...

Thanks, Not trying to be a spammer (this is the only group I will do this with), but I thought if anyone was interested, it would be this group! Thanks, Joe http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3617539231&category=1251&

I am trying to use pthread_allocator for a multi-threaded code. However it does not seem to compile. Heres the code snippet: #include <list> #include <bits/pthread_allocimpl.h> using namespace std;

I wanted to hold information about open files in a struct and be able pass it around, but the behavior is not what I would expect. Can someone tell me why this doesn't work? (Even better, what is the proper way to do this, eg, without the pointers and such). As is probably obvious, I am not terribly knowledgable here. The *fs.of<< ......

I need to have a constructor that is passed a integer number that defines the size of an array in the private area of the Class. Is that possible? For example in main() the user is asked for the number of lanes. Then when the object is declared after that it is passed that integer, which then creates an array of pointers.

The following code gives the link error: Unresolved external 'C1<int>::f()' referenced from D:\PROGRAM FILES\BORLAND\CBUILDER5\PROJECTS\MAIN.OBJ Using Borland CBuilder5. If i define the body of the function f in the header file1.h, it links ok. I believe this is normal language behaviour because all the ATL libs are defined in the...

I'm sorry for my English. I had captured an image using: error=capSetCallbackOnVideoStream(hCaptur, VideoStreamCallback); and relativ functions. In VideoStreamCallback in lpVHdr I can have the RGB sequence of my captured image.