错误：‘io_context’不是‘boost：：asio’的成员，而error：‘steady_timer’不是‘boost：：asio’的成员
错误：‘io_context’不是‘boost：：asio’的成员，而error：‘steady_timer’不是‘boost：：asio’的成员
提问于 2020-06-23 19:25:11
我被我的第一个asio代码卡住了。我从官方网站(asio/教程/tuttimer1.html)上读过教程的第一部分。
这是代码
#include <iostream>
#include <boost/asio.hpp>
int main()
{
boost::asio::io_context io;
boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5));
t.wait();
std::cout << "First app with asio!" << std::endl;
return 0;
}这里有一些错误
egor@PC:~/Documents/Programming/boost_asio_practice$ g++ trial.cpp
trial.cpp: In function ‘int main()’:
trial.cpp:6:15: error: ‘io_context’ is not a member of ‘boost::asio’
boost::asio::io_context io;
^~~~~~~~~~
trial.cpp:6:15: note: suggested alternative: ‘connect’
boost::asio::io_context io;
^~~~~~~~~~
connect
trial.cpp:7:15: error: ‘steady_timer’ is not a member of ‘boost::asio’
boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5));
^~~~~~~~~~~~
trial.cpp:7:15: note: suggested alternative: ‘deadline_timer’
boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5));
^~~~~~~~~~~~
deadline_timer
trial.cpp:8:2: error: ‘t’ was not declared in this scope
t.wait();
^
trial.cpp:8:2: note: suggested alternative: ‘tm’
t.wait();
^
tmUPD:我已经安装了最新版本的boost。现在我收到了这些错误，我该怎么办？
/tmp/ccArqi4D.o: In function `boost::asio::detail::posix_event::posix_event()':
trial.cpp:(.text._ZN5boost4asio6detail11posix_eventC2Ev[_ZN5boost4asio6detail11posix_eventC5Ev]+0x4d): undefined reference to `pthread_condattr_setclock'
/tmp/ccArqi4D.o: In function `boost::asio::detail::posix_thread::~posix_thread()':
trial.cpp:(.text._ZN5boost4asio6detail12posix_threadD2Ev[_ZN5boost4asio6detail12posix_threadD5Ev]+0x26): undefined reference to `pthread_detach'
/tmp/ccArqi4D.o: In function `boost::asio::detail::posix_thread::join()':
trial.cpp:(.text._ZN5boost4asio6detail12posix_thread4joinEv[_ZN5boost4asio6detail12posix_thread4joinEv]+0x2b): undefined reference to `pthread_join'
/tmp/ccArqi4D.o: In function `boost::asio::detail::posix_thread::start_thread(boost::asio::detail::posix_thread::func_base*)':
trial.cpp:(.text._ZN5boost4asio6detail12posix_thread12start_threadEPNS2_9func_baseE[_ZN5boost4asio6detail12posix_thread12start_threadEPNS2_9func_baseE]+0x3a): undefined reference to `pthread_create'
/tmp/ccArqi4D.o: In function `boost::asio::detail::posix_signal_blocker::posix_signal_blocker()':
trial.cpp:(.text._ZN5boost4asio6detail20posix_signal_blockerC2Ev[_ZN5boost4asio6detail20posix_signal_blockerC5Ev]+0x64): undefined reference to `pthread_sigmask'
/tmp/ccArqi4D.o: In function `boost::asio::detail::posix_signal_blocker::~posix_signal_blocker()':
trial.cpp:(.text._ZN5boost4asio6detail20posix_signal_blockerD2Ev[_ZN5boost4asio6detail20posix_signal_blockerD5Ev]+0x2d): undefined reference to `pthread_sigmask'
collect2: error: ld returned 1 exit status回答 1
Stack Overflow用户
发布于 2020-06-23 20:26:05
你可能在使用更老版本的boost。历史要大得多:从1.66到1.66的文档已经声明：
时光机
下面是1.65.1的在Wandbox上直播：
#include <boost/asio.hpp>
#include <iostream>
int main() {
boost::asio::io_service io;
boost::asio::deadline_timer t(io, boost::posix_time::seconds(5));
t.wait();
std::cout << "First app with asio!" << std::endl;
}打印
First app with asio!回到未来
同样，使用1.73.1的在Wandbox上直播：
#include <boost/asio.hpp>
#include <iostream>
int main() {
boost::asio::io_context io;
boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5));
t.wait();
std::cout << "First app with asio!" << std::endl;
}打印
First app with asio!2017年12月18日
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原文链接：
https://stackoverflow.com/questions/62542319
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