加速編譯錯誤

Question

我試圖編譯我的提振簡單的代碼：使用G ++使用此命令

g++ main.cpp -o main 

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

void workerFunc(const char* msg, float delay_ms) 
{ 
boost::posix_time::milliseconds workTime(delay_ms); 

std::cout << "Worker: running, message = " << msg << std::endl; 

// Pretend to do something useful... 
boost::this_thread::sleep(workTime); 

std::cout << "Worker: finished" << std::endl; 
} 

int main(int argc, char* argv[]) 
{ 
std::cout << "main: startup" << std::endl; 

boost::thread workerThread(workerFunc, "Hello, Boost!", 2.5e3); 

std::cout << "main: waiting for thread" << std::endl; 

workerThread.join(); 

std::cout << "main: done" << std::endl; 

return 0; 
} 

，但我得到這樣的錯誤：

main.cpp: In function `void workerFunc(const char*, float)': 
main.cpp:7: error: `boost::posix_time' has not been declared 
main.cpp:7: error: `milliseconds' was not declared in this scope 
main.cpp:7: error: expected `;' before "workTime" 
main.cpp:12: error: `boost::this_thread' has not been declared 
main.cpp:12: error: `workTime' was not declared in this scope 
main.cpp: In function `int main(int, char**)': 
main.cpp:21: error: no matching function for call to `boost::thread::thread(void (&)(const char*, float), const char[14], double)' 
/usr/include/boost/thread/thread.hpp:35: note: candidates are: boost::thread::thread(const boost::thread&) 
/usr/include/boost/thread/thread.hpp:38: note:     boost::thread::thread(const boost::function0<void, std::allocator<boost::function_base> >&) 
/usr/include/boost/thread/thread.hpp:37: note:     boost::thread::thread() 

怎麼了，怎麼編譯它？

Answer 1

由於編譯器無法識別某種類型，這意味着您缺少一些包含。

對於posix_time，您需要在代碼頂部添加#include "boost/date_time/posix_time/posix_time.hpp"。

Answer 2

根據這一

http://www.boost.org/doc/libs/1_45_0/doc/html/date_time/posix_time.html

你需要這個

#include "boost/date_time/posix_time/posix_time.hpp" 

Answer 3

你需要包含頭宣佈了posix_time。看看增強文檔，看看它是什麼（你可以嘗試#include "boost/date_time/posix_time/posix_time_system.hpp"，但我不知道這是足夠的）。

Answer 4

我懷疑你的系統中安裝了舊版本的Boost。閱讀文件/usr/include/boost/version.hpp。取決於您擁有的版本，請參閱版本特定的文檔（請參閱Boost Documentation）。或者使用系統的打包功能（如果可用）或手動按照安裝說明安裝最新版本的Boost（請參閱Getting Started on Unix Variants）。