What's the equivalent of new/delete of C++ in C?
Or it's the same in c/c++? ...
c++
Equivalent of %02d with std::stringstream?
I wan't to output an integer to a std::stringstream with the equivalent format of printf's %02d. Is there an easier way to achieve this than: std::stringstream stream; stream.setfill('0'); stream.setw(2); stream << value; Is it possible to stream some sort of format flags to the stringstream, something like (pseudocode): stream << fl...
left-hand operand of comma has no effect?
Hello there, I'm having some trouble with this warning message, it is implemented within a template container class int k = 0, l = 0; for ( k =(index+1), l=0; k < sizeC, l < (sizeC-index); k++,l++){ elements[k] = arryCpy[l]; } delete[] arryCpy; this is the warning i get cont.h: In member function `void Container<T...
How to: Inline assembler in C++ (under Visual Studio 2010)
I'm writing a performance-critical, number-crunching C++ project where 70% of the time is used by the 200 line core module. I'd like to optimize the core using inline assembly, but I'm completely new to this. I do, however, know some x86 assembly languages including the one used by GCC and NASM. All I know: I have to put the assemble...
Large File transfer from Flex client to C++ server through UDP
Hi all,I am trying to build a UDP application(P2P) of Large file transfer in Flex. My back end is C++. How can I transfer my client's files to server without any middle server. If I use stratus services..how to connect that to C++. Please help me, if possible with source code. Thank you. ...
enum type in C++
This works: enum TPriority { EPriorityIdle = -100, EPriorityLow = -20, EPriorityStandard = 0, EPriorityUserInput = 10, EPriorityHigh = 20 }; TPriority priority = EPriorityIdle; But this doesn't work: TPriority priority = -100; Any reason? ...
Problem Building dschaefer / android-box2d
I'm trying to build dschaefer android-box2d, and did follow the recipe. I do get this error when trying to build the TestBox2d with eclipse: make all /cygdrive/c/android/android-ndk-r3/build/prebuilt/windows/arm-eabi-4.2.1/bin/arm-eabi-ld \ -nostdlib -shared -Bsymbolic --no-undefined \ -o obj/libtest.so obj/test.o -L../box2d/lib/andro...
Visual Studio Solution: static or shared projects?
When a whole project (solution) consists of multiple subprojects (.vcproj), what is a preferable way to tie them: as static libraries or as shared libraries? Assuming that those subprojects are not used elsewhere, the shared libraries approach shouldn't decrease memory usage or load time. ...
What grid distributed computing frameworks are currently favoured for trading systems
There seems to a quite a few grid computing frameworks out there, but which ones are actually being used to any great extent by the investment banks for purposes of low latency distributing calculation? I'd be interested to hear answers covering both windows,Linux and cross platform. Also, what RPC mechanisms seem to be favoured most? I...
Statically Init a derived class
With c++, Is there a way to get a derived class to inherit its own static initializer? I am trying to do something like the following: class Base { public: class StaticInit { public: virtual StaticInit() =0; }; }; class Derived: public Base { public: virtual StaticInit::Stati...
allocating extra memory for a container class.
Hey there, I'm writing a template container class and for the past few hours have been trying to allocate new memory for extra data that comes into the container (...hit a brick wall..:| ) template <typename T> void Container<T>::insert(T item, int index){ if ( index < 0){ cout<<"Invalid location to insert " << index << endl...
Is extern keyword really necessary?
... #include "test1.h" int main(..) { count << aaa <<endl; } aaa is defined in test1.h,and I didn't use extern keyword,but still can reference aaa. So I doubt is extern really necessary? ...
Including Libraries C++
How do I properly include libraries in C++? I'm used to doing the standard libraries in C++ and my own .h files. I'm trying to include wxWidgets or GTK+ in code::blocks and/or netbeans C/C++ plugin. I've included ALL libraries but I constantly get errors such as file not found when it is explicitly in the include! One error: test1.cpp...
Benefit of using multiple SIMD instruction sets simultaneously
I'm writing a highly parallel application that's multithreaded. I've already got an SSE accelerated thread class written. If I were to write an MMX accelerated thread class, then run both at the same time (one SSE thread and one MMX thread per core) would the performance improve noticeably? I would think that this setup would help hide...
Visual studio c++ documentation generator
Hi Is there a way to get documentation(like javadoc) in a visual-c++ project? I'm using visual studio 2010. thanks! ...
On reference_wrapper and callable objects
Given the following callable object: struct callable : public std::unary_function <void, void> { void operator()() const { std::cout << "hello world" << std::endl; } }; a std::tr1::reference_wrapper<> calls through it: callable obj; std::tr1::ref(obj)(); Instead, when the operator() accepts an argument: s...
How to loop through a boost::mpl::list?
This is as far as I've gotten, #include <boost/mpl/list.hpp> #include <algorithm> namespace mpl = boost::mpl; class RunAround {}; class HopUpAndDown {}; class Sleep {}; template<typename Instructions> int doThis(); template<> int doThis<RunAround>() { /* run run run.. */ return 3; } template<> int doThis<HopUpAndDown>() { /* hop ho...
optimization math computation (multiplication and summing)
Suppose you want to compute the sum of the square of the differences of items: $\sum_{i=1}^{N-1} (x_i - x_{i+1})^2$ the simplest code (the input is std::vector<double> xs, the ouput sum2) is: double sum2 = 0.; double prev = xs[0]; for (vector::const_iterator i = xs.begin() + 1; i != xs.end(); ++i) { sum2 += (prev - (*i)) * (prev - (...
How to call a templated operator overload without using the word 'operator'?
class RunAround; class HopUpAndDown; class Sleep; template<typename Acts> int doThis(); template<> int doThis<RunAround>() { /* run run run.. */ return 3; } template<> int doThis<HopUpAndDown>() { /* hop hop hop.. */ return 2; } template<> int doThis<Sleep>() { /* zzz.. */ return -2; } struct Results { template<typenam...
Way to get unsigned char into a std::string without reinterpret_cast?
I have an unsigned char array that I need in a std::string, but my current way uses reinterpret_cast which I would like to avoid. Is there a cleaner way to do this? unsigned char my_txt[] = { 0x52, 0x5f, 0x73, 0x68, 0x7e, 0x29, 0x33, 0x74, 0x74, 0x73, 0x72, 0x55 } unsigned int my_txt_len = 12; std::string my_std_string(reinterpret_c...