string_selector.hpp

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// Copyright (C) 2022-2023 by Camden Mannett.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "arg_router/utility/compile_time_string.hpp"
 
#ifndef AR_ENABLE_CPP20_STRINGS
 
#    include <boost/preprocessor/variadic.hpp>
 
namespace arg_router::multi_lang
{
template <std::size_t I, typename... S>
using string_selector = std::tuple_element_t<I, std::tuple<S...>>;
}  // namespace arg_router::multi_lang
 
#    define AR_SM_UNPACK(z, n, var_list) AR_STRING(BOOST_PP_ARRAY_ELEM(n, var_list))
 
#    define SM_(I, ...)                                                                  \
        arg_router::multi_lang::string_selector<I,                                       \
                                                BOOST_PP_ENUM(                           \
                                                    BOOST_PP_VARIADIC_SIZE(__VA_ARGS__), \
                                                    AR_SM_UNPACK,                        \
                                                    BOOST_PP_VARIADIC_TO_ARRAY(__VA_ARGS__))>
 
#endif