why construction called when i overload the operator new in c++ by calling malloc

[joey]

hi:
i overload the operator new, codes shown as below:

void * __cdecl operator new(unsigned int size, const char *file, int line)
{
void *ptr = (void *)malloc(size);

return ptr;
}

and when i want to create a class object

CTest::CTest()
{
int a = 0;
}
CTest::~CTest()
{
int b = 0;
}

int main()
{
CTest* test = new CTest;
delete test;
return 0;
}

it is very obvious that i overload the operator new by malloc, so when i use the overloaded new operator to create a class object, the CTest's construction should not be called, while the result is complete opposite. And
my question: why the class's construction function can be called when i create it by malloc but not new?

[weaknessforcats]

When you create an object either using or not using the new operator, the compiler allocates the memory for your onject and then calls the class constructor.

When you overload operator new, all you are doing is affecting wthe compiler allocates memory for your object. Once that's done, the class constructor is called.

BTW: Overriding operator new so you can use malloc() is pointless since the default implementation of operator new is to call malloc().