C++ string split

#include <iostream>
#include <vector>
#include <string>
#include <sstream>
std::vector<std::string> str_split(const std::string& str, const std::string& whitespace = " \n\r\t", const uint32_t maxSplit = -1)
{
    constexpr auto npos = std::string::npos;

    std::vector<std::string> vec;
    size_t i = 0;
    size_t amountSplit = 0;
    while (i != npos)
    {
        if (maxSplit != -1 && ++amountSplit > maxSplit)
        {
            i = str.find_first_not_of(whitespace, i);
            vec.emplace_back(str.data() + i, str.size() - i);
            return vec;
        }

        i = str.find_first_not_of(whitespace, i);

        if (i == npos)
            return vec;

        size_t endIdx = str.find_first_of(whitespace, i + 1);

        vec.emplace_back(str.data() + i,
                                        (endIdx == npos ? str.size() : endIdx) - i);
        i = endIdx;
    }
    return vec;
}
std::vector<std::string_view> str_split_sv(std::string_view str, std::string_view whitespace = " \n\r\t", const uint32_t maxSplit = -1)
{
    constexpr auto npos = std::string_view::npos;

    std::vector<std::string_view> vec;
    size_t i = 0;
    size_t amountSplit = 0;
    while (i != npos)
    {
        if (maxSplit != -1 && ++amountSplit > maxSplit)
        {
            i = str.find_first_not_of(whitespace, i);
            vec.emplace_back(str.data() + i, str.size() - i);
            return vec;
        }

        i = str.find_first_not_of(whitespace, i);

        if (i == npos)
            return vec;

        size_t endIdx = str.find_first_of(whitespace, i + 1);

        vec.emplace_back(str.data() + i,
                                        (endIdx == npos ? str.size() : endIdx) - i);
        i = endIdx;
    }
    return vec;
}
std::vector<std::string> sstr_split(const std::string& input, const char delim = ' ')
{
    std::stringstream stream{input};
    std::vector<std::string> result;
    for(std::string str; std::getline(stream, str, delim);)
        result.push_back(std::move(str));
    return result;
}
int main()
{
    std::string str = "This is  a test";
    auto vec = str_split_sv(str);

    std::cout << '"' << str << "\" (" << str.size() << " chars)\n" << vec.size() << " substrings:\n";

    for(size_t i = 0, len = vec.size(); i < len; ++i)
        std::cout << i << " - [" << vec[i] << "]\n";

    std::cout << "\nEnd of program.";
}