I am using g++ to compile some code. I wrote the following snippet: bool WriteAccess = true; string Name = "my_file.txt"; ofstream File; ios_base::open_mode Mode = std::ios_base::in | std::ios_base::binary; if(WriteAccess) Mode |= std::ios_base::out | std::ios_base::trunc; File.open(Name.data(), Mode); And I receive these errors... ...
Hello, let's say I want my users to use only one class, say SpecialData. Now, this data class would have many methods, and depending on the type of data, the methods do different things, internally, but return externally similar results. Therefore my wanting to have one "public" class and other "private", child classes that would chang...
How to create a script to : compare two trees, in c/c++ in a non recursive mode? also, How to create a script in c/c++ to verify if a tree is binary, in a non recursive mode? thanks in advance. ...
Do interfaces need a virtual destructor, or is the auto-generated one fine? For example, which of the following two code snippets is best, and why? Please note that these are the WHOLE class. There are no other methods, variables, etc. In Java-speak, this is an "interface". class Base { public: virtual void foo() = 0; virtual ~B...
The original question is related to overloading operator= and I like to share my findings as it was nontrivial for me to find them. I cannot imagine reasonable example to use (a=b) as lvalue. With the help of IRC and google I've found the next article: http://msdn.microsoft.com/en-us/magazine/cc301415.aspx it provides two examples. ...
A quick question: When i pass a variable to a function, does the program make a copy of that variable to use in the function? If it does and I knew that the function would only read the variable and never write to it, is it possible to pass a variable to the function without creating a copy of that variable or should I just leave tha...
So I am required to write a fairly basic Windows service and have never done so before. Of C#, C++ (the Visual Studio suite), what is the best language to develop in? I am a student, and am most familiar with OO languages such as Java. Additionally, if anyone can recommend any books, articles, or google searches that would be relevant t...
I create a VBO in a function and I only want to return the VBO id. I use glDrawArrays in another function and I want it to draw all the vertices in the VBO without needing to also pass the number of vertices. The VBO also contains texture coordinate data. Thank you. ...
Is there any way to know if an object is a const object or regular object, for instance consider the following class class String { String(const char* str); }; if user create a const object from String then there is no reason to copy the passed native string and that because he will not make any manipulation on it, the only thing h...
I have a program that reads arbitrary data from a file system and outputs results in Unicode. The problem I am having is that sometimes filenames are valid Unicode and sometimes they aren't. So I want a function that can validate a string (in C or C++) and tell me if it is a valid UTF-8 encoding. If it is not, I want to have the invalid ...
How can I make pure virtual function a operator+(); function. wheh ı do like this in base class int operator+()=0; compiler gives error . in derive class operator+() function compiler say that derive class cannot make . because following class is abstract I know that I cannot create object of abstract classes but now I try to make der...
I had some good insight to an earlier post regarding this, but I have no idea what these compile errors mean that I could use some assistant on. Templates, friends, and overloading are all new, so 3 in 1 is giving me some problems... 1>main.obj : error LNK2019: unresolved external symbol "public: __thiscall Point<double>::Point<double>...
Hi, I have an ipod touch program that should receive messages from a server program on my mac. To make sure that the touch can receive messages from a computer other than a mac, I programmed the server in C++. If I run both the server and the ipod app on the same computer (the app running on the simulator), the connection is fine and eve...
Just curious, I was told that with dll files, you can make modifications to the dll without recompiling the whole application that uses it. On the other hand .lib files need to be compiled so the code can linked to the application as one. So I know that the .lib files are turned into machine code. but what about the dll's ?? Are they t...
I'm getting confused with implicit and explicit declarations. I don't know why you need to explicitly say or at certain times. For example, In my main.cpp #include <iostream> #include "Point.h" int main() { Point<int> i(5, 4); Point<double> *j = new Point<double> (5.2, 3.3); std::cout << i << *j; Point<int> k; ...
I'm writing a device driver that is loaded by a 3rd-party driver. I need a way to determine the name of the 3rd-party driver that is loading my device driver (for debug purposes). For example, GetModuleFileName will provide me the name of the executable. I'd like instead to be able to get the DLL names. The stack trace may be one o...
First of all I should probably say that the term 'constant object' is probably not quite right and might already mean something completely different from what I am thinking of, but it is the best term I can think of to describe what I am talking about. So basically I am designing an application and I have come across something that seem...
I want a lite-weight C++ XML parser/DOM that: Can take UTF-8 as input, and parse into UTF-16. Maybe it does this directly (ideal!), or perhaps it provides a hook for the conversion (such as taking a custom stream object that does the conversion before parsing). Offers some XPath support. I've been looking at RapidXML, the Kranf xmlP...
I'm having trouble with isdigit. I read the documentation, but when I cout << isdigit(9), I get a 0. Shouldn't I get a 1? #include <iostream> #include <cctype> #include "Point.h" int main() { std::cout << isdigit(9) << isdigit(1.2) << isdigit('c'); // create <int>i and <double>j Points Point<int> i(5, 4); Point<doub...
I always hear the relationship between collision detection and the different space partitioning techniques. Do any physics libraries contain common data structures like maybe a frustum class or anything that would make it easier to implement octrees, quadtrees, etc? ...