c++ std:thread编译出错记录

https://coderwall.com/p/rzkw6q

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...

$ ./bareterminate 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:

$ ./bareHello from thread!