boost

问题 I've been trying to find a way to sample random vectors from a multivariate normal distribution in C++, having both the mean vector and the covariance matrix, much like Matlab's mvnrnd function works. I've found relevant code for a class that implements this on this page, but I've been having some problems compiling it. I've created a header file that is being included on my main.cpp, and I'm trying to create an object of the EigenMultivariateNormal class: MatrixXd MN(10,1); MatrixXd CVM(10

问题 I'm trying to Parse a String with Boost::Spirit, but i just cannot get it to work. I have no experience with Boost::Spirit since today. The string is composed of commands separated by an ';'. The commands are "INC someInteger" "BOMB firstInteger secondInteger" "MOVE firstInteger secondInteger thirdInteger" "MSG someString" "WAIT" I Managed to get this far: #include <boost/spirit/include/qi.hpp> #include <boost/phoenix/phoenix.hpp> using namespace boost::spirit; int main() { std::string

问题 I'm trying to Parse a String with Boost::Spirit, but i just cannot get it to work. I have no experience with Boost::Spirit since today. The string is composed of commands separated by an ';'. The commands are "INC someInteger" "BOMB firstInteger secondInteger" "MOVE firstInteger secondInteger thirdInteger" "MSG someString" "WAIT" I Managed to get this far: #include <boost/spirit/include/qi.hpp> #include <boost/phoenix/phoenix.hpp> using namespace boost::spirit; int main() { std::string

问题 I need to create a parser for quoted strings for my custom language that will also properly handle escape sequences, which includes allowing escaped quotes within the string. This is my current string parser: x3::lexeme[quote > *(x3::char_ - quote) > quote] where quote is just a constant expression for '"' . It does no escape sequence handling whatsoever. I know about boost::spirit::classic::lex_escape_ch_p , but I've no idea how to use that with the boost::spirit::x3 tools (or in general).

问题 I am testing the shared memory using the boost. Also, i've noticed that i can use the shell command "ipcs -m" to check how many shared memory now in my system. After i ran the code below, the application worked well, but, i cannot see the shared memory created by the application via the command "ipcs -m" Can anyone tell me why? what should i do to check the shared memory except ipcs? #include <boost/interprocess/shared_memory_object.hpp> #include <boost/interprocess/mapped_region.hpp>

问题 It seems like boost::process::system is leaking fds: Let's say I have this simple code to flush iptables config every 3 seconds (just an example): #include <boost/process.hpp> #include <thread> int main(void) { while(true) { std::this_thread::sleep_for(std::chrono::seconds(3)); boost::process::system(boost::process::search_path("iptables"), "-F"); } return 0; } If I observe the count of open file descriptors by listing /proc/PID/fd |wc -l , I can see that the count increases by one every 3

问题 It seems like boost::process::system is leaking fds: Let's say I have this simple code to flush iptables config every 3 seconds (just an example): #include <boost/process.hpp> #include <thread> int main(void) { while(true) { std::this_thread::sleep_for(std::chrono::seconds(3)); boost::process::system(boost::process::search_path("iptables"), "-F"); } return 0; } If I observe the count of open file descriptors by listing /proc/PID/fd |wc -l , I can see that the count increases by one every 3

问题 It seems like boost::process::system is leaking fds: Let's say I have this simple code to flush iptables config every 3 seconds (just an example): #include <boost/process.hpp> #include <thread> int main(void) { while(true) { std::this_thread::sleep_for(std::chrono::seconds(3)); boost::process::system(boost::process::search_path("iptables"), "-F"); } return 0; } If I observe the count of open file descriptors by listing /proc/PID/fd |wc -l , I can see that the count increases by one every 3

问题 I'm currently trying to serialize and deserialize an openCV Mat so that i can send the frame from a client to server using Boost. The problem i am having is that when i deserialise the image it gives duplicate overlapping images in different colours. I am not sure why this is happening. Any help would be much appreciated. I'm sorry I cannot post an image as i do not have enough badges. header file for custom serialisation of cv::Mat #ifndef cv__Mat_Serialization_serialization_h #define cv_

问题 I'm currently trying to serialize and deserialize an openCV Mat so that i can send the frame from a client to server using Boost. The problem i am having is that when i deserialise the image it gives duplicate overlapping images in different colours. I am not sure why this is happening. Any help would be much appreciated. I'm sorry I cannot post an image as i do not have enough badges. header file for custom serialisation of cv::Mat #ifndef cv__Mat_Serialization_serialization_h #define cv_