How to deallocate dynamic memory pointer return from a function?

Question

I understand
int* intPtr = new int;
delete intPtr;
char* charPtr = new char[10];
delete[] charPtr;
however, if the dynamic pointer is returned from a function
char* foo(){
char* charPtr2 = new char[20];
return charPtr2;
}
char* charPtr3 = foo();
cout << charPtr3 << endl;
delete[] chatPtr3; //is this correctly deallocated the dynamic memory?
how if I do it like this,
cout << foo() << endl;
//will the dynamic memory allocated in the function deallocate automatically?
//if not, how to deallocate it?

Answer 1

delete charPtr3[] will work, because it is the same address. When you cout << foo() << endl; You are creating a memory leak. It will not be deallocated till your program exits.