Function compares all arguments with the first

EqualsToOneOf.cpp

// Checks if there is an argument equal to the first
template<typename T, typename ...Tail>
bool EqualsToOneOf(const T &t, const Tail&... tail){
    if constexpr (sizeof...(tail) == 0) {
        return false;
    }else {
        return ( (t == tail) || ...);
    }
}