I'm testing a C++ class with a number of functions that all have basically the same form: ClassUnderTest t; DATATYPE data = { 0 }; try { t.SomeFunction( &data ); } catch( const SomeException& e ) { // log known error } catch( ... ) { // log unknown error } Since there's a lot of these, I thought I'd write a function to do...
Is there any pattern how to deal with a lot of object instantiations (40k per second) on a mobile device? I need these objects separately and they cannot be combined. A reusage of objects would probably be a solution. Any hints? ...
What is the best way to test an implementation of a mutex is indeed correct? (It is necessary to implement a mutex, reuse is not a viable option) The best I have come up with is to have many (N) concurrent threads iteratively attempting to access the protected region (I) times, which has a side effect (e.g. update to a global) so that t...
I'm writing an app that will basically be like Fraps, but it will push video frames as a DirectShow Capture Source. This will make it easy to stream games on websites like ustream, justin.tv, etc. I'm wondering what the best way to do the interprocess communication would be. Speed is very important. Right now I have a dll that is injecte...
I have a SharePoint DLL that does some licensing things and as part of the code it uses an external C++ DLL to get the serial number of the hardisk. When I run this application on Windows Server 2003 it works fine, but on Windows Server 2008 the whole site (loaded on load) crashes and resets continually. This is not Windows Server 2008 ...
Hi Guys Im trying to parse the string located in /proc/stat in a linux filesystem using c++ I have lifted and saved the string as a variable in a c++ program I want to lift individual values from the string. Each value is separated by a space. I want to know how i would, for example, lift the 15th value from the string. Regards Pa...
I am currently working on a program that takes Visual Basic data in the form of a text file, and then stores this data in C++. Some of the data from Visual Basic is of the type Decimal. C++ has no built in type equivalent to decimal. I don't want to use double because there is a possible loss of significant figures if the numbers are ...
Could you have: template <class T> const T &operator[] (unsigned int x) My thinking was if you have a map<string,string> it would be nice to have a wrapper class which lets you do: obj["IntVal"]="12"; obj["StringVal"]="Test"; int i = obj["IntVal"]; How close to this can we actually get in C++? Is it worth the pain? ...
Hello all, I am using the boost::spirit parser. At one point when I use real_p, the value coming out of the parser stack is 38672000 instead of the actual value, 386731500. Some how it is considering it as a float value, I think. Is there anyway to fix this? Do I need to set the precision of real_p, or am using real_p in the wrong conte...
Hi, I am trying to sort a buffer full of variable-length records alphabetically in C++. I previously asked how to implement this, and was told to sort an array of pointers to the records. I set up an array of pointers, but realized that each pointer points to the beginning of a record, but there is no way of it knowing when the record s...
Hi, I want to use this function "EnumWindows(EnumWindowsProc, NULL);". The EnumWindowsProc is a Callback function: BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam); For this callback I want to use a member function of a class. e.g: Class MyClass { BOOL CALLBACK My_EnumWindowsProc(HWND hwnd, LPARAM lParam); void ...
I want to get the numpunct<char> facet for the native locale. I can generate a native locale object by constructing an object with an empty string std::locale native_loc(""), but once I have it how do I get a numpunct from it? The documentation I've found doesn't really show the connection between the two. ...
AFAIK, for pointers/references static_cast if class definition is not visiable to compiler at this point, than static_cast will be behave like reinterpret_cast. Why static_cast is unsafe for pointers/references and is safe for numeric values? ...
When you have a LPCWSTR, why is it a Long Pointer? There's no Long in it's definition, as far as I know. Can anybody explain? ...
I wonder how to get something like this 1 write copy(a,b,2,3) 2 and then get, a[2]=b[2]; a[3]=b[3]; a[4]=b[4]; I know that C #defines can't be used recursively to get that effect, so I suppose that template meta-programming is in place. I know there is a boost library for that, but I only want that "simple" trick, and boost is ...
I'm looking for a way if you know the location where to read the text for example say, under a particular category, how would you connect to a website and search & read the text from it? what steps do i need to follow to learn about that? ...
Hello all, I am using stringstream in my entire project which has more than 30 files. I recently overcomed an issue caused by stringstring where I was parsing the double to stringstream and there was a precision lost. So now I want to set the precision for all the files. Is there any way to set it somewhere globally so that I dont need ...
For my compsci class, I am implementing a Stack template class, but have run into an odd error: Stack.h: In member function ‘const T Stack<T>::top() const [with T = int]’: Stack.cpp:10: error: passing ‘const Stack<int>’ as ‘this’ argument of ‘void Stack<T>::checkElements() [with T = int]’ discards qualifiers Stack<T>::top() lo...
For a few years now, I've been using Eclipse as my all-purpose file editor, regardless of the language I use (which mainly includes C++, Matlab and python, with some XML thrown in for fun). However, I recently got a new machine with more a recent Eclipse, and the wonderful Colorer plugin, which I previously used, crashes (Which is a se...
I don't want constructor called. I am using placement new. I just want to allocate a block of T. My standard approach is: T* data = malloc(sizeof(T) * num); however, I don't know if (data+i) is T-aligned. Furthermore, I don't know if this is the right "C++" way. How should I allocate a block of T without calling its constructor? ...