'thread' was not declared in this scope

Asked Mar 31 '18 at 16:07

Active Mar 31 '18 at 16:11

Viewed 1,112 times

I am a newbie to c++. Currently I am learning how to use thread. However, I cannot build and run the program correctly using thread. The system keep giving me warning "'thread' was not declared in this scope". I am using Eclipse OXYGEN and MinGW with Windows 7. I have searched for solution for an entire day. I tried to select the dialect of GCC C++ Compiler as ISO C++11 and added "-std=c++0x" for the editor's discovery. I also tried to add pthread in the library. And I even reinstalled all the stuff, but neither of these help.

Below is the code:

#include <string>
#include <iostream>
#include <thread>
using namespace std;
void task1(string msg){
    cout << "task1 says: " << msg;
}
int main()
{
    thread t1(task1, "Hello");
    t1.join();
    return 0;
}

And the errors are:

..\main.cpp:10:5: error: 'thread' was not declared in this scope

..\main.cpp:11:5: error: 't1' was not declared in this scope

Any suggestion?Thanks a lot.

asked Mar 31 '18 at 16:07

taeioum

1

What version of GCC is this? Please be more specific about which software you're using. – Lightness Races in Orbit Mar 31 '18 at 16:10
2

Relevant: https://softwareengineering.stackexchange.com/q/195639/17853 – Lightness Races in Orbit Mar 31 '18 at 16:12
Possible duplicate: https://stackoverflow.com/q/18913542/560648 – Lightness Races in Orbit Mar 31 '18 at 16:12
I am sorry that I am not familiar with the software! May I know where can I check the version of GCC? – taeioum Mar 31 '18 at 16:24
I checked, it should be 6.3.0. – taeioum Mar 31 '18 at 16:45
Give exact version numbers for all the named software. – Lightness Races in Orbit Mar 31 '18 at 16:56
Also read: https://stackoverflow.com/a/30390278/560648 – Lightness Races in Orbit Mar 31 '18 at 16:56
i followed https://stackoverflow.com/questions/20037574/threads-in-eclipse-and-c11, but still not work. – taeioum Mar 31 '18 at 17:10
That's for a completely different operating system. Did you read the pages I linked you to yet? – Lightness Races in Orbit Mar 31 '18 at 17:22
Yes. I think you pointed out the main problem. I used win32, which has no C++11 multithreading features. Thanks a lot!! – taeioum Mar 31 '18 at 17:26
Okay, good luck! – Lightness Races in Orbit Mar 31 '18 at 17:28

'thread' was not declared in this scope

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