boost asio 无法识别计时器对象

Question

我正在尝试运行从 boost documentation timer2

提升示例

这是代码：

#include <iostream>
#include <boost/asio.hpp>

void print(const boost::system::error_code& /*e*/)
{
  std::cout << "Hello, world!" << std::endl;
}

int main()
{
  boost::asio::io_context io;

  boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5));
  t.async_wait(&print);

  io.run();

  return 0;
}

我收到以下错误：错误：“io_context”不是

member of ‘boost::asio’ boost::asio::io_context io; ^~~~~~~~~~ /home/mosh/Desktop/untitled1/main.cpp:62:16: note: suggested alternative: ‘connect’ boost::asio::io_context io; ^~~~~~~~~~ connect /home/mosh/Desktop/untitled1/main.cpp:64:16: error: ‘steady_timer’ is not a member of ‘boost::asio’
boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5)); ^~~~~~~~~~~~ /home/mosh/Desktop/untitled1/main.cpp:64:16: note: suggested alternative: ‘deadline_timer’ boost::asio::steady_timer t(io, boost::asio::chrono::seconds(5)); ^~~~~~~~~~~~ deadline_timer /home/mosh/Desktop/untitled1/main.cpp:65:3: error: ‘t’ was not declared in this scope t.async_wait(&print); ^ /home/mosh/Desktop/untitled1/main.cpp:65:3: note: suggested alternative: ‘tm’ t.async_wait(&print); ^ tm /home/mosh/Desktop/untitled1/main.cpp:67:3: error: ‘io’ was not declared in this scope io.run(); ^~

Answer 1

因为你有 boost 版本 1.58 你需要根据 relevant version.

更改你的代码

#include <iostream>
#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp> // <- look at this header

void print(const boost::system::error_code& /*e*/)
{
  std::cout << "Hello, world!" << std::endl;
}

int main()
{
  boost::asio::io_service io;

  boost::asio::deadline_timer t(io, boost::posix_time::seconds(5)); //<- this deffernt 
  t.async_wait(&print);

  io.run();

  return 0;
}

此外，不要忘记将 make/CMake 文件中的 link 更改为 boost_system

boost asio 无法识别计时器对象

boost asio doesn't recognize timer object

c++

boost

boost-asio