c++ std:thread编译出错记录-优快云博客

本文详细介绍了如何在C++11中正确使用线程库。首先，需要确保编译器支持C++11标准，并通过指定编译选项来启用。其次，为使程序能够成功运行，还需链接到操作系统提供的线程库，如Linux下的libpthread。文章通过一个简单的示例程序，展示了从编译到执行过程中可能遇到的问题及解决方案。

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Consider the following code, which uses the C++11 (used to be known as C++0x) thread library:

#include <iostream>
#include <thread>

using namespace std;

void hello_world()
{
  cout << "Hello from thread!\n";
}

int main()
{
  thread t(hello_world);
  t.join();
  return 0;
}

How can we get this to work? If we compile it with:

g++ bare.cpp -o bare

We'll get something like:

/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.

... and maybe something about the thread type used in the code:

error: ‘thread’ was not declared in this scope

So we add the std=c++0x ...

g++ bare.cpp -std=c++0x -o bare

No errors during compilation, but when we try to execute bare...

$ ./bare
terminate called after throwing an instance of 'std::system_error'
  what():  
Aborted

... oops. We have to link this against the operating system's implementation of threads. In linux, this is the libpthread library. The winning command is:

g++ bare.cpp -std=c++0x -lpthread -o bare

and then:

$ ./bare
Hello from thread!