Method wstring widen

include/CLI/impl/Encoding_inl.hpp:133–133

CLI11_INLINE std::string narrow(const wchar_t *str) { return detail::narrow_impl(str, std::wcslen(str)); }

CLI11_INLINE std::wstring widen(const char *str, std::size_t str_size) { return detail::widen_impl(str, str_size); }
CLI11_INLINE std::wstring widen(const std::string &str) { return detail::widen_impl(str.data(), str.size()); }
// Flawfinder: ignore
CLI11_INLINE std::wstring widen(const char *str) { return detail::widen_impl(str, std::strlen(str)); }