Effective C++ 23. Prefer non-member non-friend functions to member functions

class WebBrowser {
public:
    ...
    void clearCache();
    void clearHistory();
    void removeCookies();
    ...
};

class WebBrowser {
public:
    ...
    void clearEverything();
    ...
};

greater encapsulation is the non-member non-friend function

void clearBrowser(WebBrowser& wb) {
    wb.clearCache();
    wb.clearHistory();
    wb.removeCookies();
}

// header "webbrowser.h"
namespace WebBorwserStuff {
    class WebBrowser {...};
    ...
}

// header "webbrowserbookmarks.h"
namespace WebBorwserStuff {
    ...
}

// header "webbrowsercookies.h"
namespace WebBorwserStuff {
    ...
}