‘std::thread‘ has not been declared

出现这个问题的原因就是 目前MinGW GCC64还不支持std::thread

这是我的gcc版本

PS D:\MyCode> gcc --version
gcc.exe (x86_64-win32-seh-rev0, Built by MinGW-W64 project) 8.1.0
Copyright © 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

#include 
#include 

int main(){
    ::std::cout << ::std::thread::hardware_concurrency() << std::endl;
    system("pause");
    return 0;
}
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console Out:

‘std::thread’ has not been declared

经过一番查找，给出一个比较简单解决方式：
进入 https://github.com/meganz/mingw-std-threads 这个仓库，下载下图中的这几个库到本地的项目内

然后引入 mingw.thread.h 即可

#include 
#include "mingw.thread.h"

int main(){
    ::std::cout << ::std::thread::hardware_concurrency() << std::endl;
    system("pause");
    return 0;
}
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如果你并不想替换所有的包
那么该仓库下也是给出了一种方案