ostream& endl(ostream&);
cout << "howdy" << endl;
ostream& ostream::operator<<(ostream& (*pf)(ostream&)) { return pf(*this); }
//: C04:nl.cpp // Creating a manipulator. #include <iostream> using namespace std; ostream& nl(ostream& os) { return os << '\n'; } int main() { cout << "newlines" << nl << "between" << nl << "each" << nl << "word" << nl; } ///:~
Listado 5.19. C04/nl.cpp
cout.operator<<(nl) è nl(cout)
os << '\n';