尚未声明std :: this_thread

Question

我正在尝试编译取自的代码 std::this_thread::sleep_for()

#include <iostream>
#include <chrono>
#include <thread>

int main()
{
    using namespace std::chrono_literals;
    std::cout << "Hello waiter" << std::endl; // flush is intentional
    auto start = std::chrono::high_resolution_clock::now();
    std::this_thread::sleep_for(2s);
    auto end = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double, std::milli> elapsed = end-start;
    std::cout << "Waited " << elapsed.count() << " ms\n";
}

当我尝试编译代码时，我收到以下错误

  

错误：'std :: this_thread'尚未声明

我的GCC版本是6.3.0。

我怎么编译？任何的想法？