I have one std::list<> container and these threads: One writer thread which adds elements indefinitely. One reader/writer thread which reads and removes elements while available. Several reader threads which access the SIZE of the container (by using the size() method) There is a normal mutex which protects the access to the list fro...
Is it good practice to have a class constructor that uses default parameters, or should I use separate overloaded constructors? For example: // Use this... class foo { private: std::string name_; unsigned int age_; public: foo(const std::string& name = "", const unsigned int age = 0) : name_(name), age_(ag...
In C++, what's the generic way to convert any floating point value (float) to fixed point (int, 16:16 or 24:8)? EDIT: For clarification, fixed-point values have two parts to them: an integer part and a fractional part. The integer part can be represented by a signed or unsigned integer data type. The fractional part is represented by ...
Say I've got a class like this: class Test { int x; SomeClass s; } And I instantiate it like this: Test* t = new Test; Is x on the stack, or the heap? What about s? ...
I have the following struct in C++: #define MAXCHARS 15 typedef struct { char data[MAXCHARS]; int prob[MAXCHARS]; } LPRData; And a function that I'm p/invoking into to get an array of 3 of these structures: void GetData(LPRData *data); In C++ I would just do something like this: LPRData *Results; Results = (LPRData *)mal...
I have an MFC sdi app that uses a splitter window to contain a tree control alongside the main view showing the data. When the user selects something in the tree, that view keeps focus until the user deliberately clicks in the main data window. This means that any toolbar buttons associated with the main view are disabled. Is there a...
In a C++ project, compilation dependencies can make a software project difficult to maintain. What are some of the best practices for limiting dependencies, both within a module and across modules? ...
Is there a fix or a workaround for the memory leak in getpwnam? ...
Looking for an answer for C# and C++. (in C#, replace 'destructor' with 'finalizer') ...
I'm writing some cross-platform code between Windows and Mac. If list::end() "returns an iterator that addresses the location succeeding the last element in a list" and can be checked when traversing a list forward, what is the best way to traverse backwards? This code workson the Mac but not on Windows (can't decrement beyond first e...
Typically you will find STL code like this: for (SomeClass::SomeContainer::iterator Iter = m_SomeMemberContainerVar.begin(); Iter != m_SomeMemberContainerVar.end(); ++Iter) { } But we actually have the recommendation to write it like this: SomeClass::SomeContainer::iterator Iter = m_SomeMemberContainerVar.begin(); SomeClass::SomeCont...
Possible Duplicate: The Definitive C++ Book Guide and List Hi all, suppose that you have a good C understanding. Which C++ book would you recommend? Maybe the best book you can think of? Thanks ...
I'm told that the template system in C++ is Turing-complete at compile time. This is mentioned in this post and also on wikipedia. Can you provide a nontrivial example of a computation that exploits this property? Is this fact useful in practice? ...
Is there a way to find out what gcc flags a particular binary was compiled with? ...
Hello all, any thoughts on this would be appreciated: std::string s1 = "hello"; std::string s2 = std::string(s1); I'd now expect these two strings to be independent, i.e. I could append ", world" to s2 and s1 would still read "hello". This is what I find on windows and linux but running the code on a HP_UX machine it seems that s2 and ...
I frequently encounter some definitions for Win32API structures (but not limited to it) that have a cbSize member as in the following example. typedef struct _TEST { int cbSize; // other members follow } TEST, *PTEST; And then we use it like this: TEST t = { sizeof(TEST) }; ... or TEST t; t.cbSize = sizeof(TEST); ... My ...
If I have an array of a fixed size depending on how it is defined and used, I typically use one of two ways to reference it. Array type 1: Since it is a fixed size based on a define, I just use that define in all my loops referencing it. #define MAXPLAYERS 4 int playerscores[MAXPLAYERS]; for(i=0;i<MAXPLAYERS;++i) { .... do something ...
I'm trying to port an old library (that doesn't use namespaces as far as I can tell) to modern compilers. One of my targets can't tell the difference between System::TObject and ::TObject (without a namespace). System::TObject is native to the compiler. I've tried a using directive, i.e. using ::TObject; But that doesn't do it. The ob...
I'm trying to create a c++ library for use on windows/MSVC. My problem is that it seems that in order to link properly, I need to distribute a bunch of different versions, linked against different versions of MSVC's c++ runtimes - single and multi-threaded, debug and release, different compiler versions, various other security and other...
I need to generate random numbers in the range 1 - 10000 continuously with out duplication. Any recommendations? Description: we are building a new version for our application, which maintains records in Sqlite DB. in the last version of our application, we did not had unique key for each record. But now with new upgraded version, we n...