LocaleSettingsSwitch.h

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#pragma once
#include <locale>
class LocaleSettingsSwitch
{
public:
    LocaleSettingsSwitch(const char intendedDecimalSeparator)
    {
        const char currentSeparator = *std::localeconv()->decimal_point;
        if (intendedDecimalSeparator != currentSeparator)
        {
            _reset = true;
            char* local = std::setlocale(LC_NUMERIC, nullptr);
            if (local == nullptr)
            {
                throw std::exception("Failed to determine active locale settings for decimal separator.");
            }
            else
            {
                _oldLocale = std::string(local);
            }
            if (intendedDecimalSeparator == '.')
            {
                std::setlocale(LC_NUMERIC, "en_US.UTF8");
            }
            else if(intendedDecimalSeparator == ',')
            {
                std::setlocale(LC_NUMERIC, "de_DE.UTF-8");
            }
            else
            {
                throw std::exception("Intended decimal separator is not supported.");
            }
        }
    }
    ~LocaleSettingsSwitch()
    {
        if (_reset)
        {
            std::setlocale(LC_NUMERIC, _oldLocale.c_str());
        }
    }
private:
    std::string _oldLocale = "";
    bool _reset = false;
};