I have some Objective-C++ code that I'm trying to get events out of an Objective-C object to call a method within a C++ object. I'm very new to Objective-C, so I may be doing this all wrong. Example: @interface KnobClass { } -(void)Event; @end class DoorClass { public: KnobClass * knob; void start() { knob = [[KnobClass a...
I am fooling around with C++ and const references and am confused why this code works: #include <iostream> class A { public: A() : a_(50) {} const int& getA() const { return a_; } private: const int a_; }; int main(int argc, char* argv[]) { A* a = new A(); const int& var = a->getA(); std::cout << var << std::en...
I'm trying to compile this C++ program which utilizes the GLUT32 libraries. Right now I'm getting the following errors: Error 1 error LNK2001: unresolved external symbol _gluPerspective@32 Camera.obj soundCube Error 2 error LNK2001: unresolved external symbol _gluLookAt@72 Camera.obj soundCube Error 3 error LNK2...
I find the update operation on set tedious since there's no such an API on cplusplus. So what I currently do is sth like this: //find element in set by iterator Element copy = *iterator; ... // update member value on copy, varies Set.erase(iterator); Set.insert(copy); Basically the iterator return by Set is a const_iterator and you ca...
Hello: I'm getting some odd behavior in one of my class members and it is truly throwing me for a loop but I'm certainly not seeing the issue (long week!) void MyFakeStringClass::readStream( iostream& nInputStream ) { // Hold the string size UINT32 size = 0; // Read the size from the stream nInputStream.read( reinterpr...
When I compile a program using just gcc code.c There are no messages, and an output file is generated successfully. The outputted file works. However, when I try to the same cygwin installation's gcc compiler in an IDE (I've tried Netbeans and Dev-C++), I get the following errors main.cpp:27: error: `exit' undeclared (first use this ...
In C its optional. In C++ one "MUST" declare a function before its used/defined. Why is it so? Whats the need? We don't do that in C# or Java. Funny thing is while we are defining a function. The definition itself has a declaration even then, we need to declare. God knows why? ...
This question may be a duplicate, but I can't find a good answer. Short and simple, what requires me to declare using namespace std; in C++ programs? ...
Hi, I am asking one basic question about the initialization. My understanding is that the int will be initialized to 0 automatically. However, it's not. The code below print random value. Can anybody tell me the rule of initialization? Under what condition, the variable will be initialized automatically? int main () { int a[10]; int i...
Problem with operator[] in c++, i have some class: 197 class Permutation{ 198 private: 199 unsigned int* array; 200 unsigned int size; 201 202 void fill(){ 203 for(unsigned int i=0;i<size;i++) 204 array[i]=i; 205 ...
What is better adjacency lists or adjacency matrix for graph problems in c++? And what are the advantages and disadvantages of each? EDIT:can anyone provide a link with a clean code for say Breadth first search in linked lists format ?? ...
My renderer used to render geometry with the old fixed function stuff using glBegin/glEnd. After switching it to use vertex arrays via glVertexPointer et. al., my Cg shaders stopped showing up. If i just do a regular texture binding, it works fine, so the array data is solid. Also if I use the old glBegin/glEnd system, the Cg shaders wor...
I wrote a class that wraps an iterator and returns transformed values on demand: // iterator-wrapper.h template<class Iter, class Val, class Fct> class IteratorWrapper { Iter cur_; const Iter last_; const Fct fct_; public: IteratorWrapper(Iter first, Iter last, const Fct fct) : cur_(first), last_(last), fct_(fct) {} con...
Why typedef can not be used with static? For example, the code below is an error typedef static int INT2; What other rules should be follow to use the typedef? What other keywords can not be used with typedef? Thanks so much! ...
Hi, I'm trying to create a named constructor for my class Matrix, with an input as a stream from which I can read the values for the initialization. #include <istream> // ... class Matrix { public: Matrix(int); // some methods static Matrix *newFromStream(istream&); private: int n; std::valarray< Cell > data; }; ...
i have known that winpcap library enabled a person to obtain advanced information about installed devices... given all the networking devices found in the computer, how will i know which one of this has an internet connection?! thanks:) ...
How i can read\export data within a C++ application to Excel files? I was found the xlslib project, but it only compiles with MingW on Windows. My target platform is windows (MVS2008) ...
I'm looking for a way to get two programs to efficiently transmit a large amount of data to each other, which needs to work on Linux and Windows, in C++. The context here is a P2P network program that acts as a node on the network and runs continuously, and other applications (which could be games hence the need for a fast solution) will...
I need to write a program that reads in either from ifstream or cin, depending on parameters passed into the program at runtime. I was planning on doing the following: istream in; if(argv[1] == "cin") { in = cin; } else { ifStream inFile; inFile.open(argv[1].c_str()); in = inFile; } However, istream in...
I am writing some code for handling data. There are a number of groups of processing functions that can be chosen by the user that are then applied to the dataset. I would like to implement all these groups in separate places, but since they all take the same parameters and all do similar things I would like for them to have a common int...