Method wstring widen_impl

include/CLI/impl/Encoding_inl.hpp:93–122

}

CLI11_INLINE std::wstring widen_impl(const char *str, std::size_t str_size) {
#if CLI11_HAS_CODECVT
#ifdef _WIN32
    return std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>>().from_bytes(str, str + str_size);

#else
    return std::wstring_convert<std::codecvt_utf8<wchar_t>>().from_bytes(str, str + str_size);

#endif  // _WIN32
#else   // CLI11_HAS_CODECVT
    (void)str_size;
    std::mbstate_t state = std::mbstate_t();
    const char *it = str;

    std::string old_locale = std::setlocale(LC_ALL, nullptr);
    auto sg = scope_guard([&] { std::setlocale(LC_ALL, old_locale.c_str()); });
    set_unicode_locale();

    std::size_t new_size = std::mbsrtowcs(nullptr, &it, 0, &state);
    if(new_size == static_cast<std::size_t>(-1)) {
        throw std::runtime_error("CLI::widen: conversion error in std::mbsrtowcs at offset " +
                                 std::to_string(it - str));
    }
    std::wstring result(new_size, L'\0');
    std::mbsrtowcs(const_cast<wchar_t *>(result.data()), &str, new_size, &state);

    return result;

#endif  // CLI11_HAS_CODECVT
}

CLI11_DIAGNOSTIC_POP