types::str capitalize(types::str const &s)
{
if (s.empty())
return s;
else {
types::str copy = s;
copy[0] = ::toupper(s[0]);
std::transform(s.begin() + 1, s.end(), copy.begin() + 1, ::tolower);
return copy;
}
}
bool isalpha(types::str const &s)
{
return !s.empty() && std::all_of(s.chars().begin(), s.chars().end(),
(int (*)(int))std::isalpha);
}