#include <string>
#include <iostream>

namespace detail {

template<char...Chars>
bool checkSize(const std::string& s) {
    return sizeof...(Chars) <= s.size();;
}

template<size_t N, char C, char...Chars>
struct StartsWith {
    static const bool apply(const std::string& s) {
        return s[N] == C && StartsWith<N + 1, Chars...>::apply(s);
    }
};

template<size_t N, char C>
struct StartsWith<N, C> {
    static const bool apply(const std::string& s) {
        return s[N] == C;
    }
};

} // detail

template<char...Chars>
bool startsWith(const std::string& s) {
    return detail::checkSize<Chars...>(s) && detail::StartsWith<0, Chars...>::apply(s);
}

int main() {
    std::string x = "zlonejzlejsi";
    std::cout << startsWith<'z','l','o'>(x) << std::endl;

    return 0;
}