UPDATE: I’ve since this was written replaced Boost.Log with my own custom logging, mostly because I decided to get rid of all Boost dependencies in all my projects for various reasons. If you are fine with using Boost I guess Boost.Log is still a valid choice judging by Klaim’s answer. My experience with Boost.Log in … Read more
I’ve run into this issue myself. The key to a solution is that the function po::store populates the variables_map while po::notify raises any errors encountered, so vm can be used prior to any notifications being sent. So, as per Tim, set each option to required, as desired, but run po::notify(vm) after you’ve dealt with the … Read more
This is the simplest way for an amateur like me who is studying C++ on their own: First Unzip the boost library to any directory of your choice. I recommend c:\directory. Open your visual C++. Create a new project. Right click on the project. Click on property. Click on C/C++. Click on general. Select additional … Read more
As rdbound said, Boost has a “near STL” status. So if you don’t need another library, stick to Boost. However, I use POCO because it has some advantages for my situation. The good things about POCO IMO: Better thread library, especially a Active Method implementation. I also like the fact that you can set the … Read more
You should link in the libboost_system library. I am not sure about codeblocks, but the g++ command-line option on your platform would be -lboost_system
A basic example: #include <boost/uuid/uuid.hpp> // uuid class #include <boost/uuid/uuid_generators.hpp> // generators #include <boost/uuid/uuid_io.hpp> // streaming operators etc. int main() { boost::uuids::uuid uuid = boost::uuids::random_generator()(); std::cout << uuid << std::endl; } Example output: 7feb24af-fc38-44de-bc38-04defc3804de
I don’t know if Boost has more specific functions, but you can do it with the standard library. Given std::vector<double> v, this is the naive way: #include <numeric> double sum = std::accumulate(v.begin(), v.end(), 0.0); double mean = sum / v.size(); double sq_sum = std::inner_product(v.begin(), v.end(), v.begin(), 0.0); double stdev = std::sqrt(sq_sum / v.size() – mean … Read more
Well, just do it like the boost guys did it: template <class T> inline void hash_combine(std::size_t& seed, const T& v) { std::hash<T> hasher; seed ^= hasher(v) + 0x9e3779b9 + (seed<<6) + (seed>>2); }
There are at least three places where you may find shared_ptr: If your C++ implementation supports C++11 (or at least the C++11 shared_ptr), then std::shared_ptr will be defined in <memory>. If your C++ implementation supports the C++ TR1 library extensions, then std::tr1::shared_ptr will likely be in <memory> (Microsoft Visual C++) or <tr1/memory> (g++’s libstdc++). Boost … Read more
The magic number is supposed to be 32 random bits, where each is equally likely to be 0 or 1, and with no simple correlation between the bits. A common way to find a string of such bits is to use the binary expansion of an irrational number; in this case, that number is the … Read more