Function Join

libraries/lib-string-utils/StringUtils.h:52–81

template<template<typename, typename...> typename ContainerType, typename ResultType, typename SeparatorType, typename... Rest>
ResultType Join(
   const ContainerType<ResultType, Rest...>& container,
   const SeparatorType& separator)
{
   if (container.empty())
      return ResultType {};

   const auto sepratorLength = StringLength(separator);
   const auto totalSeparatorLength = sepratorLength * (container.size() - 1);

   ResultType result;

    const auto size = std::accumulate(
       container.begin(), container.end(), totalSeparatorLength,
       [](size_t size, const ResultType& item)
       { return size + StringLength(item); });

    result.reserve(size);

    bool first = true;
    for (const auto& item : container)
    {
        if (!first)
            result += separator;
        result += item;
        first = false;
    }

    return result;
}

STRING_UTILS_API std::string  ToLower(const std::string& str);
STRING_UTILS_API std::string  ToLower(const std::string_view& str);