// https://www.cnblogs.com/bigben0123/p/13728595.html

// https://sf-zhou.github.io/programming/chinese_encoding.html

// https://blog.csdn.net/wanggao_1990/article/details/113973730

#include <codecvt>

#include <fstream>

#include <iostream>

#define print(x) std::cout << x << std::endl

int main() {

const std::locale utf8( std::locale(), new std::codecvt_utf8<wchar_t> );

const std::wstring love_cpp = L"\x6211\x7231""C++"; // 我爱C++

std::wcout.imbue(utf8);

std::wcout << love_cpp << std::endl; // 输出 "我爱C++"

std::wcout << love_cpp.length() << std::endl; // 输出 5

std::wcout << love_cpp.substr(0, 2) << std::endl; // 输出 "我爱"

const auto k_output_filename = "test_02.txt";

std::wofstream f_out(k_output_filename, std::ios::out);

f_out.imbue(utf8);

f_out << love_cpp << std::endl;

f_out.close();

std::wifstream f_in(k_output_filename, std::ios::in);

f_in.imbue(utf8);

std::wstring value;

f_in >> value;

std::wcout << (value == love_cpp ? "Yes": "Opps") << std::endl; // 输出 "Yes"

f_in.close();

}