[英]C++11 future::wait_for compile error
i am trying to make multi-threading application where every thread will be proccessing task for different time. 我正在尝试制作多线程应用程序,其中每个线程将在不同的时间处理任务。 So i want to use future and future::wait_for function. 所以我想使用future和future :: wait_for函数。 But when i use only code from CPP reference 但是当我仅使用CPP参考中的代码时
#include <iostream>
#include <future>
#include <thread>
#include <chrono>
int main()
{
std::future<int> future = std::async(std::launch::async, [](){
std::this_thread::sleep_for(std::chrono::seconds(3));
return 8;
});
std::cout << "waiting...\n";
std::future_status status;
do {
status = future.wait_for(std::chrono::seconds(1));
if (status == std::future_status::deferred) {
std::cout << "deferred\n";
} else if (status == std::future_status::timeout) {
std::cout << "timeout\n";
} else if (status == std::future_status::ready) {
std::cout << "ready!\n";
}
} while (status != std::future_status::ready);
std::cout << "result is " << future.get() << '\n';
}
I get compile error: 我得到编译错误:
thread.cpp:31:58: error: cannot convert ‘bool’ to ‘std::future_status’ in assignment
I am using ubuntu 12.04 and gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) Any thoughts ? 我正在使用ubuntu 12.04和gcc版本4.6.3(Ubuntu / Linaro 4.6.3-1ubuntu5)有什么想法吗? Thanks ! 谢谢 !
G++ 4.6.3 is not supporting C++11 fully, so updating to a later version that has full support for C++11 (which is gcc 4.7 or later) will solve this sort of issue. G ++ 4.6.3不完全支持C ++ 11,因此更新到对C ++ 11完全支持的更高版本(gcc 4.7或更高版本)将解决此类问题。 Or use clang 3.4 (3.2 supports a lot of C++11, but 3.4 supports a lot more and has better optimisation on top of that). 或使用clang 3.4(3.2支持很多C ++ 11,但是3.4支持很多,并且在此基础上具有更好的优化)。
According to this commit log, the return type was changed from bool
to std::future_status
in Feb 2012 and GCC 4.7 (on Mar 22, 2012) was the first release shipped with the new version of wait_for
. 根据此提交日志,返回类型在2012年2月从bool
更改为std::future_status
,GCC 4.7(在2012年3月22日发布)是新版本的wait_for
附带的第一个发行版。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.