Greetings. I'm just getting started with the boost::asio library and have run into some early difficulty related to boost::asio::ip::tcp::iostream. My question has two parts: 1.) How does one connect an iostream using simply host and port number? I can make the client and server [boost.org] examples work fine as coded. The server sp...
Hi, This is not a question of what is boxing and unboxing, it is rather why do languages like Java and C# need that ? I am greatly familiar wtih C++, STL and Boost. In C++ I could write something like this very easily, std::vector<double> dummy; I have some experience with Java, but I was really surprised because I had to write som...
I'm evaluating the AtomineerUtils addin (which allows Visual Studio to auto-enter doxygen comment blocks). It misfires slightly when I have a class definition that has __declspec (dllexport) in it. That is, instead of the class name appearing in the comment block it adds, it uses the word declspec. Small annoyance, but annoyance nonet...
Hi, i have some sourcecode that I want to compile with VS2008 but there are many errors i have to fix. Now there are some Enums like: enum { BACKGROUND = 0x00000001, WEAPON = 0x00000002, TRANSPARENT = 0x00000004 } The problem is that TRANSPARENT is defined as: #define TRANSPARENT 1 in WinGDI.h That will cause a comp...
When I compile the following code using g++ class A {}; void foo(A&) {} int main() { foo(A()); return 0; } I get the following error messages: > g++ test.cpp -o test test.cpp: In function ‘int main()’: test.cpp:10: error: invalid initialization of non-const reference of type ‘A&’ from a temporary of type ‘A’ test.cpp:6: er...
Is it a bug to do this: if(some_error) throw Cat("Minoo"); Where Cat is a class. Then in some other function that called the method that threw the exception... I would have: catch(const Cat &c) { } If it is invalid, do I use new Cat("Minoo"); Would that cause a memory leak? ...
Hello, I have a the following C++ function void FillAndReturnString(char ** someString) { char sourceString[] = "test"; *someString = new char[5]; memcpy(*someString, sourceString, 5); } It is declared as extern "C" { __declspec(dllexport) void __cdecl FillAndReturnString(char ** someString); } How do I call this func...
If I throw an exception: throw Cat("Minoo"); Then I catch and rethrow with ... at some lower level in the call stack: catch(...) { throw; } Then at some other lower level in the call stack I try to catch with: catch(const Cat& c) { //Will it enter here, and if so will c be valid data? } catch(...) { } ...
Hi all, currently I'm struggling trying to use a COM dll on a simple system that I've made. Everything compiles successfully, but in runtime the CoCreateInstace is returning S_OK, but somehow my object pointer is returning NULL. This interface pointer is created on my class header. The weirdest thing is that instantiating this same po...
I don't know if there is an official name for this, but I have been playing with what I like to call the "self-factory" pattern. Basically, it's when an abstract base class acts as a factory for itself. Let me explain: I have Foo objects and Bar objects in my system, which are used via interfaces FooInterface and BarInterface. I need...
I'd like to build a base (abstract) class (let's call it type::base) with some common funcionality and a fluent interface, the problem I'm facing is the return type of all those methods class base { public: base(); virtual ~base(); base& with_foo(); base& with_bar(); protected: // whatever.....
Possible Duplicate: Should objects delete themselves in C++? In my application, I'm creating many objects that "own themselves" - in the sense that after they are created and told to "go," only the object itself can determine when it should be deleted. For example, if I was writing a game, I might have multiple Enemy objects. ...
Hi, I'm not sure if return *this is the only way we could return an instance of a class who called a member function? Reason why I asked is because our instructor told us to avoid using pointers if necessary and I'm wondering if this is a case where the only necessary way to do it is by returning the this pointer. I'm working wit...
I need to take a C++ vector with potentially a lot of elements, erase duplicates, and sort it. Looks like this code will do the trick: (Correction--it won't; next time I'll test before posting. Thanks for the feedback.) vec.erase( std::unique(vec.begin(), vec.end()), vec.end()); std::sort(vec.begin(), vec.end()); Is it f...
Hello, Stack Overflow! I was wondering what exactly putting 'extern "C"' in your C++ program does. Thanks! ...
I've implemented a simple socket wrapper class. It includes a non-blocking function: void Socket::set_non_blocking(const bool b) { mNonBlocking = b; // class member for reference elsewhere int opts = fcntl(m_sock, F_GETFL); if(opts < 0) return; if(b) opts |= O_NONBLOCK; else opts &= ~O_NONBLOCK; ...
I just spent way too long trying to diagnose why, in the following snippet of code, the ProcessEvent() method seemed to be ignoring the false value I passed in for aInvokeEventHandler: HRESULT CEventManager:: Process(Event anEvent) { return (m_pPool->GetFsm()->ProcessEvent(anEvent), false); } // Definition of ProcessEvent() HRESUL...
Hello, I don't know if this is true, but when I was reading FAQ on one of the problem providing sites, I found something, that poke my attention: Check your input/output methods. In C++, using cin and cout is too slow. Use these, and you will guarantee not being able to solve any problem with a decent amount of input or output. Use...
Hi all, I asked this question yesterday since I wasn't receiving any data but strangely when I used wait in the destructor I started receveing notification from QSocketNotifier. The rest of the question is same. Can someone suggest something? I have created a sample application from where separate thread is started to read and process d...
As most programmers I admire and try to follow the principles of Literate programming, but in C++ I routinely find myself using std::pair, for a gazillion common tasks. But std::pair is, IMHO, a vile enemy of literate programming... My point is when I come back to code I've written a day or two ago, and I see manipulations of a std::pai...