NetworkUtil module function call

[ytrewq271828]

I've encountered an error while calling functions defined in NetworkUtil module.

I think the type of the argument matches the given implementation, but my IDE keeps returning the following error message.

no instance of function template "E::NetworkUtil::arrayToUINT64" matches the argument listC/C++(304)
TCPAssignment.cpp(335, 22): argument types are: (std::optional<E::ipv4_t>)

Can you tell me why this error happens?
Thanks in advance.

[Pusnow]

Your dstAddr's type seems std::optional<E::ipv4_t>.

To convert std::optional<E::ipv4_t> to E::ipv4_t, you should follow the usage of std::optional.

https://en.cppreference.com/w/cpp/utility/optional/value