Made Boost.MultiIndex compatible with BOOST_BIND_NO_PLACEHOLDERS (ticket #9798). Maintenance fixes. Multiprecision: Change floating point to rational conversions to be implicit, see 10082. Fix definition of checked_cpp_rational typedef. Fix bug in assignment from string in cpp_int, ...
int main(int argc, char* argv[]) { auto f1 = bind(create_task, 1, 2); f1(); auto f2 = bind(create_task, placeholders::_1, 0); f2(3); return 0; } 其中f2 有一个参数使用了占位符,这个参数将在调用时才传递,而 bind 需要在绑定那一刻知道使用的是哪个版本的 create_task,针对这个例...
/usr/include/boost/bind/bind_template.hpp:61: instantiated from ‘typename boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()(A1&, A2&) [with A1 = asio::error::basic_errors, A2 = int, R = void, F = boost::_mfi::mf2<void, msgSrv::msgSrv...
6. boost :: bind 初始化函数指针 能够为任何function object绑定参数。 理解bind的关键是placeholders,placeholders定义为_1到_9,你在你通常使用argument的地方使用它们。 6.1 bind到一个free fucntion (独立函数) void comm (std::string str) {…} (boost::bind(&comm, _1)) (“Isn’t this fun?”); ...
Boost.Bind defines placeholders from _1 to _9. These placeholders tell boost::bind() to return a function object that expects as many parameters as the placeholder with the greatest number. If, as in Example 41.3, only the placeholder _1 is used, boost::bind() returns an unary function ...
(boost::bind(print,asio::placeholders::error, t, count));}}int main(){asio::io_service io;int count = 0;asio::deadline_timer t(io, boost::posix_time::seconds(1));t.async_wait(boost::bind(print,asio::placeholders::error, &t, &count));io.run();std::cout << "Final count ...
{ using namespace std::placeholders; // adds visibility of _1, _2, _3,... // binding functions: auto fn_five = std::bind (my_divide,10,2); // returns 10/2 std::cout << fn_five() << '\n'; // 5 auto fn_half = std::bind (my_divide,_1,2); // returns x/2 std...
// bind 指定回调函数 handle_write(),它需要两个参数 error,bytes_transferred message = "hello client"; boost::asio::async_write(*psocket,boost::asio::buffer(message), boost::bind(&TcpServer::handle_write,this,boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred) ...
Using boost::placeholders in 16.04 is not supported (out of the box). Is there a reason why you use boost:: and not std:: ? /root/gtsam/gtsam/inference/Symbol.cpp:66:61: error: 'boost::placeholders' has not been declared return boost::bind(&Symbol::chr, boost::bind(make, boost:...
(boost::bind(print,asio::placeholders::error, t, count));}}int main(){asio::io_service io;int count = 0;asio::deadline_timer t(io, boost::posix_time::seconds(1));t.async_wait(boost::bind(print,asio::placeholders::error, &t, &count));io.run();std::cout << "Final count ...