map pass by refrence?

Can I pass a map by refrence to a function
ie:

Code:

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MainMenu::MainMenu(std::map<string,Book> rlibrary &){
    ptrLibrary=rlibrary;
    while(Menu::get_option()!=6){
        while (!(validate_option(Menu::get_option()))){
                display_menu();
                Menu::set_option(Menu::input_option());
        }
        process_option(Menu::get_option());
    }
}

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Yes, but you've used the wrong syntax. This is correct:

Code:

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MainMenu::MainMenu(std::map<string,Book> &  rlibrary){

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Thanks this programming is definitly a learning experience.