boost

问题 When configured for mutability, boost::heap::d_ary_heap uses a std::list in addition to the vector that holds the values of the heap nodes. I realize that the handles which are being provided for making the mutable_heap_interface work are in fact iterators of this list, but I'm wondering why such an expensive solution was chosen, and if there's a leaner way to achieve mutability with boost::heap::d_ary_heap . Mutability requires a way to find the index of a node in the heap vector, given the

问题 When configured for mutability, boost::heap::d_ary_heap uses a std::list in addition to the vector that holds the values of the heap nodes. I realize that the handles which are being provided for making the mutable_heap_interface work are in fact iterators of this list, but I'm wondering why such an expensive solution was chosen, and if there's a leaner way to achieve mutability with boost::heap::d_ary_heap . Mutability requires a way to find the index of a node in the heap vector, given the

问题 When configured for mutability, boost::heap::d_ary_heap uses a std::list in addition to the vector that holds the values of the heap nodes. I realize that the handles which are being provided for making the mutable_heap_interface work are in fact iterators of this list, but I'm wondering why such an expensive solution was chosen, and if there's a leaner way to achieve mutability with boost::heap::d_ary_heap . Mutability requires a way to find the index of a node in the heap vector, given the

问题 I am trying to read specific number of bytes from the socket. My server is sending: 1) byte[0] - length of the message 2) byte[1:N] - the actual message How do I read the first byte and then read the remaining bytes using boost::asio::ip::tcp::socket::read ? Here is the code snippet: // receive data through the socket void TCPTestClient::ReceiveData( ) { try { boost::system::error_code error; boost::asio::streambuf receivedStreamBuffer; // reserve 512 bytes in output sequence boost::asio:

问题 I am trying to read specific number of bytes from the socket. My server is sending: 1) byte[0] - length of the message 2) byte[1:N] - the actual message How do I read the first byte and then read the remaining bytes using boost::asio::ip::tcp::socket::read ? Here is the code snippet: // receive data through the socket void TCPTestClient::ReceiveData( ) { try { boost::system::error_code error; boost::asio::streambuf receivedStreamBuffer; // reserve 512 bytes in output sequence boost::asio:

问题 #include <boost/spirit/include/qi.hpp> #include <string> #include <vector> #include <iterator> #include <algorithm> #include <iostream> using namespace boost::spirit; int main() { std::string s; std::getline(std::cin, s); auto specialtxt = *(qi::char_('-', '.', '_')); auto txt = no_skip[*(qi::char_("a-zA-Z0-9_.\\:$\'-"))]; auto anytxt = *(qi::char_("a-zA-Z0-9_.\\:${}[]+/()-")); qi::rule <std::string::iterator, void(),ascii::space_type> rule2 = txt ('=') >> ('[') >> (']'); auto begin = s.begin

问题 #include <boost/spirit/include/qi.hpp> #include <string> #include <vector> #include <iterator> #include <algorithm> #include <iostream> using namespace boost::spirit; int main() { std::string s; std::getline(std::cin, s); auto specialtxt = *(qi::char_('-', '.', '_')); auto txt = no_skip[*(qi::char_("a-zA-Z0-9_.\\:$\'-"))]; auto anytxt = *(qi::char_("a-zA-Z0-9_.\\:${}[]+/()-")); qi::rule <std::string::iterator, void(),ascii::space_type> rule2 = txt ('=') >> ('[') >> (']'); auto begin = s.begin

问题 I have following code: old_lib.h: struct DUMMY { // some members }; module.cpp: #include <boost/python.hpp> #include "old_lib.h" namespace py = boost::python; void foo(py::object const& p) { // How to get rid of ctypes.addressof()? static py::object ctypes_addressof = py::import("ctypes").attr("addressof"); DUMMY *ptr = *reinterpret_cast<DUMMY**>(uintptr_t(py::extract<uintptr_t>(ctypes_addressof(p)))); } BOOST_PYTHON_MODULE(module) { py::def("foo", &foo, args("p")); } old_python.py: import

问题 I am trying to build boost from source and I need static linking as I am thinking to move this statically linked boost project to AWS lambda servers. I have done the following steps: I downloaded boost_1_72_0.tar.gz and tar xzvf boost_1_72_0.tar.gz inside third_party directory. cd inside boost_1_72_0. DST_DIR=/my local path/ where I want to install. ./bootstrap.sh --prefix=${DST_DIR} --includedir=${DST_DIR} --libdir={DST_DIR} --with-libraries=filesystem,system . ./b2 link=static --prefix=$

问题 I'm trying to write an expression parser with boost spirit x3. I based my new code on old code that I written years ago (and worked well) with Spirit 2.x (qi). The core of my code is: //Make new rule(s) for expression auto term = factor >> *(('*' >> factor) | ('/' >> factor)); auto expression = term >> *(('+' >> term) | ('-' >> term)); auto group = '(' >> expression >> ')'; auto factor = lexeme["double_"] | group; string s="12.4 + 3.2"; auto first = s.begin(); auto last = s.end(); bool r = x3