Does not match in any class? - c++

Question

I've encountered an issue when testing my code.
void Library::checkOutBook(std::string pID, std::string bID); {
bool patronIDMatch = false, bookIDMatch = false;
int bookOnFile=-1, patronOnFile=-1;
for (int i=0; i<members.size(); i++) {
if (pID==members[i].getIdNum()) {
patronIDMatch=true;
patronOnFile=i;
break;
}
else continue;
for the first line here, I'm getting the following errors:
Library.cpp:68: error: prototype for ‘void Library::checkOutBook(std::string, std::string)’ does not match any in class ‘Library’
Library.cpp:68: error: expected unqualified-id before ‘{’ token
But I'm matching it as it appears in my Library class as such
//Library.hpp
#ifndef LIBRARY_HPP
#define LIBRARY_HPP
#include <string>
#include <vector>
#include "Patron.hpp"
class Library {
private:
std::vector<Book*> holdings;
std::vector<Patron*> members;
int currentDate;
public:
Library();
void addBook(Book*);
void addPatron(Patron*);
std::string checkOutBook(std::string pID, std::string bID);
std::string returnBook(std::string bID);
std::string requestBook(std::string pID, std::string bID);
std::string payFine(std::string pID, double payment);
void incrementCurrentDate();
Patron* getPatron(std::string pID);
Book* getBook(std::string bID);
};
#endif
How would I go about fixing this?
i am prohibited from altering the header file unfortunately :(
edit:
void Library::returnBook(std::string bID); {
bool bookIDMatch=false;
string tempPatronID;
int bookOnFile=-1;
for (int i=0; i

Answer 1

It doesn't match because the function you're trying to define returns void:
void Library::checkOutBook(std::string pID, std::string bID)
but the declaration in the Library class says it returns std::string:
std::string checkOutBook(std::string pID, std::string bID);
Also, remove that semicolon between the ) and the { in the function header.