c++ - 如何使用#include 编译代码

Question

我正在尝试编译一些使用线程的 C++ 代码:

#include <iostream>
#include <thread>
void hello()
{
    std::cout<<"Hello Concurrent World\n";
}

int _main(int argc, _TCHAR* argv[])
{
    std::thread t(hello);
    t.join();
    return 0;
}

编译时出现错误:

c:\temp\app1\app1\app1.cpp(6): fatal error C1083: Cannot open 
include file: 'thread': No such file or directory


~/Documents/C++ $ g++ -o thread1 thread1.cpp -D_REENTRANT -lpthread
In file included from /usr/include/c++/4.5/thread:35:0,
                 from thread1.cpp:2:
/usr/include/c++/4.5/bits/c++0x_warning.h:31:2: error: #error This file 
requires compiler and library support for the upcoming ISO C++ standard, 
C++0x. This support is currently experimental, and must be enabled with 
the -std=c++0x or -std=gnu++0x compiler options.

如何修复这些错误？

Answer 1

<thread>标准线程支持是一项新功能(在 C++11 标准中定义)。至于 g++，你必须启用它添加 -std=c++0x到命令行，如错误消息中所述。

此外，您使用的是非标准(特定于 Microsoft)主程序，请使用“经典”main和正常char :

// thread1.cpp
#include <iostream>
#include <thread>

void hello()
{
    std::cout<<"Hello Concurrent World\n";
}

int main(int argc, char * argv[])
{
    std::thread t(hello);
    t.join();

    return 0;
}

请注意，并非所有 C++11 功能都适用于当前的编译器；就g++而言，你可以找到他们的执行状态here .