为什么我没有得到预期的 output 波纹管 function 过载？

Question

This is the code example of overloading of operator new and operator delete.

my expected output is:

Overloaded new  
The value is :10
Overloaded delete

But I am getting:

Overloaded new  
The value is :10

#include <iostream>
#include <stdlib.h>
using namespace std;

void *operator new(size_t n)
{
    cout<<"Overloaded new" <<endl;
    void *ptr = malloc(n);
    return ptr;
}

void operator delete(void *p)
{
    cout<<"Overloaded delete"<<endl;
    free(p);
}

int main()
{    
    int *p = new (int);
    
    *p = 10;

    cout<<"The value is :"<<*p<<endl;

    delete p;

    return 0;
}

why is this happening can anyone explain?

Answer 1

When replacing the global operator delete, you should provide two overloads

void operator delete(void *p) noexcept

and

void operator delete(void *p, size_t n) noexcept

In some situations it's unspecified which will be used.

Source cppreference