c++ - ostream operator shouldn't be calling overloaded new operator? -

i reading thinking in c++ (vol 1 - page-597). came across concept of overloading global new/delete operator.

#include <cstdio> #include <cstdlib> using namespace std; void* operator new(size_t sz) {     printf("operator new: %d bytes\n", sz);     void* m = malloc(sz);     if(!m) puts("out of memory");     return m; } void operator delete(void* m) {     puts("operator delete");     free(m); } class s {     int i[100];     public:         s() { puts("s::s()"); }        ~s() { puts("s::~s()"); } }; int main() {     puts("creating & destroying int");     int* p = new int(47);     delete p;     puts("creating & destroying s");     s* s = new s;     delete s;     puts("creating & destroying s[3]");     s* sa = new s[3];     delete []sa; } 

taking example says following :-

notice printf( ) , puts( ) used rather iostreams. because when iostream object created (like global cin, cout, , cerr), calls new allocate memory. printf( ), don’t deadlock because doesn’t call new initialize itself.

now check correctness of above statement, included iostream library , added cout statement in conttructor in hope of getting infinite loop expecting cout call new , infinite loop. worked normal. no ambiquity or infinite loop.

am missing here??