#include <codecvt>
#include <string>
#include <locale>
#include <iostream>
#include <fstream>
using namespace std;

typedef codecvt_byname<wchar_t,char,std::mbstate_t> F;
int _tmain(int argc, _TCHAR* argv[])
{
    locale::global(locale(locale(),new codecvt_utf8<wchar_t>()));

    wstring_convert<F,wchar_t> stows(new F("chs")); 
    
    string str="Hello,世界!";
    wstring wstr;

    wcout.imbue(locale("chs"));
    wstr=stows.from_bytes(str);
    wcout<<wstr<<endl;
    wofstream("E:\\Wout.txt")<<wstr;// 以UTF-8 编码保存
    
    str=stows.to_bytes(wstr);
    cout<<str<<endl;
    ofstream("E:\\out.txt")<<str;

    return 0;
}

  1: #include <ctime>

  2: #include <iostream>

  3: #include <chrono>

  4: #include <thread>

  5: #include <iomanip>

  6: using namespace std;

  7: // the function f() does some time-consuming work

  8: void f()

  9: {

 10: 	volatile double d=0;

 11: 	for(int n=0; n<1000; ++n)

 12: 		printf("%d ",n);

 13: 	printf("\n");

 14: }

 15: int main()

 16: {

 17: 	std::clock_t c_start = std::clock();

 18: 	auto t_start = std::chrono::high_resolution_clock::now();

 19: 	std::thread t1(f);

 20: 	std::thread t2(f); // f() is called on two threads

 21: 	t1.join();

 22: 	t2.join();

 23: 

 24: 

 25: 	std::clock_t c_end = std::clock();

 26: 	auto t_end = std::chrono::high_resolution_clock::now();

 27: 	std::cout << "CPU time used: "

 28: 		<< 1000.0 * (c_end-c_start) / CLOCKS_PER_SEC

 29: 		<< " ms\n";

 30: 	std::cout << "Wall clock time passed: "

 31: 		<< std::chrono::duration_cast<std::chrono::milliseconds>(t_end - t_start).count()

 32: 		<< " ms\n";

 33: 

 34: 

 35: 

 36: }

 37: