🌍 P-E-R-R-Y i18n

A modern internationalization (i18n) library.

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✨ Overview

P-E-R-R-Y i18n is a lightweight, header-only library for internationalization.
It provides a clean, type-safe way to define and switch between language locales at runtime.

Core goals:

• 🧩 Strongly typed locales using concepts and type traits
• ⚙️ System locale detection (macOS & Linux)
• 🔄 Runtime locale switching
• 🚀 Zero dependencies, header-only, C++20 concepts
• ✅ Unit-tested with GoogleTest

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🧱 Features

• Detects the system locale (fr, en, es, …)
• Fallback chain (system → en → first registered)
• Singleton pattern for shared locale management
• Compile-time locale registration with setSupportedLocales
• Works with tuples or parameter packs

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🧩 Example

#include "I18n.hpp"
#include "ILocale.hpp"
#include <tuple>
 
 
// Define your base locale interface
class DefaultLocale : public ILocale {
public:
    virtual const std::string getSignUpTitle() const = 0;
    virtual const std::string getSignInTitle() const = 0;
};
 
// Define concrete implementations
class LocaleEn : public DefaultLocale {
public:
    const std::string languageCode() const override { return "en"; }
    const std::string getSignUpTitle() const override { return "Sign Up"; }
    const std::string getSignInTitle() const override { return "Sign In"; }
};
 
class LocaleFr : public DefaultLocale {
public:
    const std::string languageCode() const override { return "fr"; }
    const std::string getSignUpTitle() const override { return "Inscription"; }
    const std::string getSignInTitle() const override { return "Connexion"; }
};
 
using SupportedLocales = std::tuple<LocaleEn, LocaleFr>
 
// Usage
int main() {
    auto& i18n = I18n<DefaultLocale>::getInstance();
 
    i18n.setSupportedLocales<SupportedLocales>();
    //cpp `i18n.setSupportedLocales<LocaleEn, LocaleFr>();`
 
    //set Locale over the default one -> 1st: system, 2nd: "en", 3rd: 1st_one
    i18n.setLocale("en");
 
    std::cout << i18n.getLocale()->getSignInTitle() << std::endl;
}