Acceptable Words

bool is_alpha(char c)
{
    return !(isalpha(c) || c == '-');
}

void Wordlist::acceptableWords()
{
    std::transform(words.begin(), words.end(), words.begin(),
                   [](std::string & word)
                   {
                       bool qualifier = std::find_if(word.begin(), word.end(), is_alpha) == word.end();
                       size_t i = word.find("--");
                       if(qualifier && word.length() > 2 && i == std::string::npos)
                           return word;
                       else
                           return word.erase(0);
                   });
    words.erase(std::remove(words.begin(),words.end(),""), words.end());
}