Hello, all
Sorry for disturbing all of you, I'm not sure whether I have sent my
question to a right mail list.
I have one c++ file named utilnew.cc:
#include <iostream>
using namespace std;
// ........overload new.delete...
void* operator new(size_t size)
{
cout << "enter my new1\n";
return malloc(size);
}
void operator delete(void* memoryPtr)
{
cout << "enter mydelete1\n";
free(memoryPtr);
}
void* operator new(size_t size, int* memHdr)
{
cout << "into my new2\n";
return malloc(size);
}
void operator delete(void* memoryPtr, int*)
{
printf("enter mydelete2\n");
}
and one header file utilnew.h
void* operator new(size_t size);
void operator delete(void* memoryPtr);
void* operator new(size_t size, int* memHdr);
void operator delete(void* memoryPtr, int*);
now I create a test c++ file named mymain.cc for test
#include <iostream>
using namespace std;
int main()
{
int *temp = new int(1);
int *p = new(temp)int;
cout << "temp is :" << temp <<"\n";
cout << "p is :" << p << "\n";
delete temp;
return 0;
}
I compile them:
g++ -o mymain mymain.cc utilnew.cc
Then run mymain
I get the following result:
enter my new1
temp is :0x9489008
p is :0x9489008
enter mydelete1
My question is:
why my first overloaded operator new is called since #include
"utilnew.h" is not added in mymain.cc? Is this related with certain
compile option?
Thanks&Regards,
Fan Xiaohua
