调用operator new noexcept 的问题

#include <iostream>
#include <new>
#include <cstdio>
using namespace std;

struct A
{
void *operator new(size_t size)
{
cout<<“operator new“<<endl;
malloc(size);
}
void operator delete(void *p)
{
cout<<“operator delete“<<endl;
free(p);
}

void *operator new(size_t size,const nothrow_t &thorw_value) noexcept
{
cout<<“operator new noexcept“<<endl;
malloc(size);
}
void operator delete(void *p,const nothrow_t &nowthrow_value) throw()
{
cout<<“operator delete noexpect.“<<endl;
free(p);
}
};

int main()
{
A *a1=new A;
delete a1;

A *a2=new(nothrow) A;
delete a2;//为什么调用的是 operator delete 而不是  operator delete noexpect
    return 0;
}

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