map<string, vector<int> > // 42 xref(istream& in, // 43 vector<string> find_words(const string&) = split) // 44
this is a cross-ref program that's written in the book, the exercise told me to create an improved feature for it. So, before I start with my work, I need to organise the code of original program in it's own file. but, when I compile the code(without any modification or anything) it won't compile with the error above.
I believed that the code filled with typo or something but I can't find any, it's new code for me anyway, so I can't really tell which part at fault. Pls help, ty.