我正在尝试编译以下简单的线程示例,该示例使用Boost库:
并且
#include <iostream>
#include <boost/thread.hpp>
#include <boost/chrono.hpp>
using namespace std;
void thread()
{
for (int i = 0; i < 5; ++i)
{
cout << i << '\n';
}
}
int main()
{
boost::thread t{thread};
t.join();
}
使用
g++ -std=c++11 -I /usr/local/boost_1_57_0 simpleThreadExample.cpp
编译器返回了以下内容:
Undefined symbols for architecture x86_64:
"boost::detail::thread_data_base::~thread_data_base()", referenced from:
boost::detail::thread_data<void (*)()>::~thread_data() in simpleThreadExample-7cec5e.o
"boost::system::system_category()", referenced from:
___cxx_global_var_init2 in simpleThreadExample-7cec5e.o
boost::thread_exception::thread_exception(int, char const*) in simpleThreadExample-7cec5e.o
"boost::system::generic_category()", referenced from:
___cxx_global_var_init in simpleThreadExample-7cec5e.o
___cxx_global_var_init1 in simpleThreadExample-7cec5e.o
"boost::thread::join_noexcept()", referenced from:
boost::thread::join() in simpleThreadExample-7cec5e.o
"boost::thread::native_handle()", referenced from:
boost::thread::get_id() const in simpleThreadExample-7cec5e.o
"boost::thread::start_thread_noexcept()", referenced from:
boost::thread::start_thread() in simpleThreadExample-7cec5e.o
"boost::thread::detach()", referenced from:
boost::thread::~thread() in simpleThreadExample-7cec5e.o
"typeinfo for boost::detail::thread_data_base", referenced from:
typeinfo for boost::detail::thread_data<void (*)()> in simpleThreadExample-7cec5e.o
"vtable for boost::detail::thread_data_base", referenced from:
boost::detail::thread_data_base::thread_data_base() in simpleThreadExample-7cec5e.o
NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
现在,以下两个程序编译并且运行得很好:
#include <locale>
#include <boost/date_time/gregorian/gregorian.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
using namespace std;
using namespace boost::gregorian;
using namespace boost::posix_time;
int main()
{
date today = day_clock::local_day();
cout << today << endl;
}
并且
#include <iostream>
#include <iomanip>
#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point.hpp>
using namespace std;
int main()
{
//point_type p = boost::geometry::make<point_type>(1, 2, 3);
//std::cout << boost::geometry::dsv(p) << std::endl;
//return 0;
boost::geometry::model::point<int, 3, boost::geometry::cs::cartesian> p;
boost::geometry::assign_values(p,1, 2, 3);
boost::geometry::model::point<int, 3, boost::geometry::cs::cartesian> p2;
p2 = p;
cout << boost::geometry::dsv(p) << endl;
cout << boost::geometry::dsv(p2) << endl;
return 0;
}
当我编译时,我会执行以下操作:
g++ -std=c++11 -I /usr/local/boost_1_57_0 <nameOfProgram.cpp>
所以,我想知道为什么只更改程序名称时,线程程序无法编译,而其他两个程序可以编译通过?
如果有帮助的话,我正在使用Boost 1.57,其路径为:
/usr/local/Cellar/boost/1.57.0
头文件的路径为:
/usr/local/Cellar/boost/1.57.0/include/boost
如果有人能提供一些见解,那将是太棒了。谢谢!
std::thread
而不是boost::thread
;由于C++11线程库是由负责boost::thread
的人设计的,因此API基本相同。 - user2030052