utility.hpp

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/* SPDX-FileCopyrightText: Copyright (c) 2024 Oğuz Toraman <oguz.toraman@tutanota.com> */
/* SPDX-License-Identifier: LGPL-3.0-only */
 
#ifndef UTILITY_HPP
#define UTILITY_HPP
 
#include <string>
#include <ranges>
#include <concepts>
#include <algorithm>
#include <functional>
 
namespace utility {
 
template <typename ContainerType, typename StringConverterType>
requires std::ranges::range<ContainerType> && requires (ContainerType c){c.empty(); typename ContainerType::value_type;}
[[nodiscard]]
inline std::string to_string(
    const ContainerType& container,
    const std::string& value_separator, StringConverterType string_converter)
{
    static_assert(
        std::same_as<std::invoke_result_t<StringConverterType, typename ContainerType::value_type>, std::string>,
        "StringConverterType must return std::string"
    );
    if (container.empty()){
        return {};
    }
    return std::ranges::fold_left(
        std::ranges::next(std::ranges::begin(container)),
        std::ranges::end(container),
        std::invoke(string_converter, *std::ranges::begin(container)),
        [&](const auto& left, const auto& right){
            return left + value_separator + std::invoke(string_converter, right);
        }
    );
}
 
} /* namespace utility */
 
#endif /* UTILITY_HPP */