Error creating a size for a vector of Structs C++

Question

This is for a project I am doing for my college class and I could not find an answer for this that worked for me anywhere. Its very likely I did not understand the answers thou

Answer 1

For class members, you do not initialise them where you declare them (as the list of members is just that: a list of types and names), but instead in the constructor's member initialisation list.

Like this:

class Menu
{
    std::vector mi;    // no initialiser here

    Menu() : mi(20) {};          // but in the ctor-initializer instead
};