boost

问题 According to the documentation the currently-running fiber retains control until it invokes some operation that passes control to the manager I can think about only one operation - boost::this_fiber::yield which may cause control switch from fiber to fiber. However, when I run something like bf::fiber([](){std::cout << "Bang!" << std::endl;}).detach(); bf::fiber([](){std::cout << "Bung!" << std::endl;}).detach(); I get output like Bang!Bung! \n \n Which means control was passed between <<

问题 For my express parser project i would like to use CSV like escaping: "" to escape " Examples: "\"hello\"", " \" hello \" ", " \" hello \"\"stranger\"\" \" ", online compile&try: https://wandbox.org/permlink/5uchQM8guIN1k7aR my current parsing rule only parses the first 2 tests qi::rule<std::string::const_iterator, qi::blank_type, utree()> double_quoted_string = '"' >> qi::no_skip[+~qi::char_('"')] >> '"'; i've found this stackoverflow question and one answer is given using spirit: How can I

问题 I have cases when there is a chunked response which is too big for beast, and I want to stop before I get to beast's body_limit , and continue handling the message from that point using plain boost::asio. Mind that this (obviously) means I already received the header and a large part of the body. I'm using it for a reverse proxy, so basically what I want to do is somehow send the incomplete response to the http client, while continuing relaying the remaining response data using boost::asio. I

问题 It seem that the only implementation that provide Safe Cross-Thread Signals for both the Signal class and what's being called in the slot is QT. (Maybe I'm wrong?). But I cannot use QT in the project I'm doing. So how could I provide safe Slots call from a different thread (Using Boost::signals2 for example)? Are mutex inside the slot the only way? I think signals2 protect themself but not what's being done inside the slot. Thanks 回答1: You can combine boost::bind and boost ASIO to create

问题 I'm trying to add colored log output for boost::log under linux. I read the following and I tried this: #define MY_LOG_ERROR() BOOST_LOG_TRIVIAL(error) << "\033[1;31" MY_LOG_ERROR() << "This is an error log." but it gives me the result below: [2016-07-11 17:23:16.328435] [0x00007f15f03d6780] [error] [1;31This is an error log. How to properly add colored log output to boost::log? 回答1: The proper way to customize output with Boost.Log is to use formatters. To set a formatter you will have to

问题 I'm trying to add colored log output for boost::log under linux. I read the following and I tried this: #define MY_LOG_ERROR() BOOST_LOG_TRIVIAL(error) << "\033[1;31" MY_LOG_ERROR() << "This is an error log." but it gives me the result below: [2016-07-11 17:23:16.328435] [0x00007f15f03d6780] [error] [1;31This is an error log. How to properly add colored log output to boost::log? 回答1: The proper way to customize output with Boost.Log is to use formatters. To set a formatter you will have to

问题 I'm trying to write an XML parser, parsing the XML file to a boost::property_tree and came upon this problem. How can I check (quickly) if a child of a certain property exists? Obviously I could iterate over all children using BOOST_FOREACH - however, isn't there a better solution to this? 回答1: optional< const ptree& > child = node.get_child_optional( "possibly_missing_node" ); if( !child ) { // child node is missing } 回答2: Here's a couple of other alternatives: if( node.count("possibliy

问题 I read at a programming blog that a program with a large number of print statements takes more time to finish it's execution as it has to send the data to output buffer continuously. I am solving the ProjectEuler problem #12. I have solved it successfully. Following are the codes #include <iostream> #include <ctime> #include <boost/multiprecision/cpp_int.hpp> using big_int = boost:: multiprecision:: cpp_int; using namespace std; clock_t start = clock(); big_int get_num(big_int num) { return

问题 Update I'm not going to add this as an answer, since I still haven't technically solved the problem. But since I've now spent 2.5 days trying to get things to work with boost-python3, I've lost the will to live with it. I've just come across pybind11 (how my previous lengthy searches for python binding tools didn't turn it up, I don't know) and am using that. 2.5 days of misery compares to <20 minutes installing and building their cmake example... and all the specific-python-version

问题 Update I'm not going to add this as an answer, since I still haven't technically solved the problem. But since I've now spent 2.5 days trying to get things to work with boost-python3, I've lost the will to live with it. I've just come across pybind11 (how my previous lengthy searches for python binding tools didn't turn it up, I don't know) and am using that. 2.5 days of misery compares to <20 minutes installing and building their cmake example... and all the specific-python-version