加速编译错误

Question

我试图编译我的提振简单的代码：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; 
} 

，但我得到这样的错误：

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() 

怎么了，怎么编译它？

Answer 1

由于编译器无法识别某种类型，这意味着您缺少一些包含。

对于posix_time，您需要在代码顶部添加#include "boost/date_time/posix_time/posix_time.hpp"。

Answer 2

根据这一

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

你需要这个

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

Answer 3

你需要包含头宣布了posix_time。看看增强文档，看看它是什么（你可以尝试#include "boost/date_time/posix_time/posix_time_system.hpp"，但我不知道这是足够的）。

Answer 4

我怀疑你的系统中安装了旧版本的Boost。阅读文件/usr/include/boost/version.hpp。取决于您拥有的版本，请参阅版本特定的文档（请参阅Boost Documentation）。或者使用系统的打包功能（如果可用）或手动按照安装说明安装最新版本的Boost（请参阅Getting Started on Unix Variants）。