toolkit/include/util.h

#ifndef UTIL_H
#define UTIL_H

#include <stringconv.h>
#include <expected>
#include <chrono>

namespace util
{

    template <typename T>
    inline std::expected<std::string, std::string> to_string(T value)
    {
        if constexpr (std::is_same_v<T, int> || std::is_same_v<T, float> || std::is_same_v<T, double>)
        {
            char buffer[buffer_size];
            auto res = std::to_chars(buffer, buffer + buffer_size, value);
            if (res.ec != std::errc())
            {
                return std::unexpected(std::make_error_code(res.ec).message());
            }
            return std::string(buffer, res.ptr - buffer);
        }
        else if constexpr (std::is_same_v<typename std::remove_const<T>::type,
                                          char *>)
        {
            return std::to_string(value);
        }
    }

    template <typename T = double> // requires std::is_same_v<T, std::string>
    inline std::expected<T, std::string> stoi(const std::string &str)
    {
        T value;
        auto res = std::from_chars(str.c_str(), str.c_str() + str.size(), value);
        if (res.ec != std::errc())
        {
            return std::unexpected(std::make_error_code(res.ec).message());
        }
        return value;
    }

    inline std::string get_time_now()
    {
        auto time_now = std::chrono::system_clock::now();
        auto now_c = std::chrono::system_clock::to_time_t(time_now);
        char buffer[32];
#if defined(_WIN32) || defined(_WIN64)
        auto _ = ctime_s(buffer, 32, &now_c);
#elif defined(__linux__)
        auto _ = ctime_r(&now_c, buffer);
#endif
        auto result = std::string(buffer);
        result = string::replace_string(result, "\n", "");
        return std::move(result);
    }
}

#endif