C++ Localization Best Practices

1#include <iostream>
2#include <locale>
3
4int main() {
5  std::locale::global(std::locale(""));
6  std::cout.imbue(std::locale());
7
8  std::cout << "Current locale: "
9    << std::locale().name() << '\n';
10}

1#include <iostream>
2#include <string>
3#include <locale>
4
5int main() {
6  std::locale::global(std::locale(""));
7  std::wcout.imbue(std::locale());
8
9  std::wstring greeting = L"Hello, world!";
10  std::wcout << greeting << L'\n';
11}

1#include <iostream>
2#include <locale>
3#include <iomanip>
4
5int main() {
6  std::locale::global(std::locale("de_DE.UTF-8"));
7  std::cout.imbue(std::locale());
8
9  double number = 1234567.89;
10  std::cout << std::fixed << std::setprecision(2)
11    << number;
12}

1#include <iostream>
2#include <locale>
3#include <ctime>
4#include <iomanip> 
5
6int main() {
7  std::time_t t = std::time(nullptr);
8
9#ifdef _WIN32
10  std::locale::global(std::locale(
11    "French_France.1252"));
12  std::cout.imbue(std::locale());
13  std::tm now;
14  localtime_s(&now, &t);
15  std::cout << std::put_time(&now, "%A %d %B %Y");
16#else
17  std::locale::global(std::locale(
18    "fr_FR.UTF-8"));
19  std::cout.imbue(std::locale());
20  std::tm* now = std::localtime(&t);
21  std::cout << std::put_time(now, "%A %d %B %Y");
22#endif
23}

1#include <libintl.h>
2#include <locale.h>
3#include <iostream>
4
5#define _(string) gettext(string)
6
7int main() {
8  setlocale(LC_ALL, "");
9  bindtextdomain("myapp", "/path/to/locale");
10  textdomain("myapp");
11
12  std::cout << _("Hello, world!") << '\n';
13}