C ++:从std :: thread的简单返回值? [英] C++: Simple return value from std::thread?
问题描述
对于win32线程,我有直接的 GetExitCodeThread()
,它给我线程函数返回的值。我正在寻找类似 std :: thread
(或boost线程)类似的东西
我知道这可以用futures,但是究竟是什么?
With win32 threads I have the straight forward GetExitCodeThread()
that gives me the value which the thread function returned. I'm looking for something similar for std::thread
(or boost threads)
As I understand this can be done with futures but how exactly?
推荐答案
See this video tutorial on C++11 futures.
显示线程和期货:
#include <thread>
#include <future>
void func(std::promise<int> && p) {
p.set_value(1);
}
std::promise<int> p;
auto f = p.get_future();
std::thread t(&func, std::move(p));
t.join();
int i = f.get();
或使用 std :: async
- 线程和期货的级别包装器):
Or with std::async
(higher-level wrapper for threads and futures):
#include <thread>
#include <future>
int func() { return 1; }
std::future<int> ret = std::async(&func);
int i = ret.get();
我无法评论它是否适用于所有平台在Linux上工作,但不是在Mac OSX上使用GCC 4.6.1构建的)。
I can't comment whether it works on all platforms (it seems to work on Linux, but doesn't build for me on Mac OSX with GCC 4.6.1).
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