hi! i have the following quadtree-like structure, in which each cell can either be a inner node or a leaf. if it is a leaf, it can store a color. if it is a inner node, it stores pointers to four children (which can be either leaf or inner node): class RenderBucketCell{ public: RenderBucketCell(); RenderBucketCell(float R, floa...
Consider the following code: typedef std::vector<int> cont_t; // Any container with RA-iterators typedef cont_t::const_iterator citer_t; // Random access iterator cont_t v(100); const int start = 15; // start > 0. citer_t it = v.begin() - start; // Do not use *it int a1 = 20, b1 = 30; // a1, b1 >= start int a2 = 30, b2 = 40; // a2, b2...
scoped_ptr is not copy able and is being deleted out of the scope. So it is kind of restricted shared_ptr. So seems besides the cases when you really need to restrict the copy operation shared_ptr is better to use. Because sometimes you don’t know you need to create a copy of your object or no. So the question is: besides the cases menti...
Hi, I'm adapting an application for touch screen interface and we're want to use the tablet text input panel included in windows vista/7, specifically its keyboard. I want to show and hide it as appropriate for my app. Basically I want ShowKeyboad() and HideKeyboard() functions. What's the best way to control this. I looked at the ITex...
I suppose you cannot simply compile a C++ application with a C++/CLI compiler. I am wondering if it would be difficult. Has anybody tried this, and if so: were there a lot of modifications needed? ...
I have the below protocol buffer. Note that StockStatic is a repeated field. message ServiceResponse { enum Type { REQUEST_FAILED = 1; STOCK_STATIC_SNAPSHOT = 2; } message StockStaticSnapshot { repeated StockStatic stock_static = 1; } required Type type = 1; optional StockStati...
Hello, I made some bindings from my C++ app for python. The problem is that I use pointers to members (It's for computing shortest path and giving the property to minimize as parameter). This is the C++ signature: std::vector<Path> martins(int start, int dest, MultimodalGraph & g, float Edge::*) This is what I did (from what I unde...
I have a problem with the functions in the string_algo package. Consider this piece of code: #include <boost/algorithm/string.hpp> int main() { try{ string s = "meißen"; locale l("de_DE.UTF-8"); to_upper(s, l); cout << s << endl; catch(std::runtime_error& e){ cerr << e.what() << endl; } try{ ...
How can I connect to a remote Mysql database, from Cpp code using Microsoft eMbedded Visual C++ (which is configured for a special board running WindowsCE)? I have downloaded the source files for Mysql C and C++ Connector/APIs but; their 'make' or installation process is pretty complicated and valid only for Visual Studio. ...
Bear with me as I dump the following simplified code: (I will describe the problem below.) class CMyClass { ... private: HRESULT ReadAlpha(PROPVARIANT* pPropVariant, SomeLib::Base *b); HRESULT ReadBeta(PROPVARIANT* pPropVariant, SomeLib::Base *b); typedef HRESULT (CMyClass::*ReadSignature)(PROPVARIANT* pPropVariant, SomeLib::Bas...
I am trying to make a toy language in c++. I have used boost spirit for the grammar, and hopefully for parser/lexer. The idea is a toy language where 'everything is an object' like javascript and some implementation of prototype based inheritance. I want to know how to implement the 'object' type for the language in c++. I saw source cod...
I have not done database programming in C++ and C# before, but did some in Java. Now I am asked to figure out the options to do it in C# or C++ (not sure which one yet). We may use the MySQL RDBMS. I searched online and found .NET SQL Data Provider, OleDB and ODBC. What other APIs exist? What's your recommendation? Do I need to buy s...
in Windows, lets say I have used DLL Injection to get into another process. I have also done some screencaptures of the memory on the process I have injected into and know the location of the data I want to pull out. Lets say there is data in the other process at 0xaaaaaaaa that contains a certain value. How do I grab this value from tha...
For a specific example,consider atoi(const std::string& ).I am very frustrated about this,since we programmers would need to use it so much. More general question is why does not C++ standard library reimplement the standard C libraries with C++ string,C++ vector or other C++ standard element rather than to preserve the old C standard ...
void insert( const Comparable & x, AvlNode * & t ) { if( t == NULL ) t = new AvlNode( x, NULL, NULL ); else if( x < t->element ) { insert( x, t->left ); if( height( t->left ) - height( t->right ) == 2 ) if( x < t->left->element ) rotateWithRig...
I have a program that is a windows service. It is started by StartServiceCtrlDispatcher function. It's network server that accepts user's inputs as command for controlling purposes. Now, I want it to have the ability to be shutdown by users, i.e. when user type a "quit" command, the service will stop. (Don't worry about how the service c...
When a C++ function accepts an std::vector argument, the usual pattern is to pass it by const reference, such as: int sum2(const std::vector<int> &v) { int s = 0; for(size_t i = 0; i < v.size(); i++) s += fn(v[i]); return s; } I believe that this code results in double dereferencing when the vector elements are accessed, beca...
Hi, On linux platform, I want to have dhcp client. port any open source client to my app (which seems to be a bit time consuming)? or communicate with the standalone client app via Signals? or anyone knows any dhcp client library? thanks for any advice. ...
Reading the question Why doesn’t C++ STL support atoi(const string& ) like functions?, I encountered a comment which warned that GCC (at least) has a bug that can slow down multi-threaded applications which use ostringstream frequently. This is apparently due to a mutex 'needed' by the C++ locale machinery. Given my recent interest in g...
Say I have a class A: class A { public: A(); void fetch_data() { return 1; } void write_x_data() { // lock this instance of A private_function1_which_assumes_locked(); private_function2_which_assumes_locked(); // unlock this instance of A } void write_y_data() { // lock this instance of A pr...