Re: private constructor and new operator overloading.
i think maybe i made a mistake.
the constructor is called after the operator new.
when we are writing the code:
MyClass* MyClass::New()
{
MyClass* pMyClass = new MyClass();
return pMyClass;
}
the compiler maybe explained like this:
MyClass* MyClass::New()
{
MyClass* pMyClass = (MyClass*)malloc(sizeof(MyClass));
pMyClass->MyClass();
return pMyClass;
}
so i think actually the constructor is called by MyClass:New();
"Paolo Maldini" <jifang1218@msn.com> ????????????:f22clq$6nq$1@news.cn99.com...
After invoking the static member function MyClass::New, the operator new
is called. Then, the constructor is called from the operator new.
"siddhu" <siddharth.sng@gmail.com>
??????:1178900167.900763.64230@n59g2000hsh.googlegroups.com...
On May 11, 12:03 pm, "Paolo Maldini" <jifang1...@msn.com> wrote:
you need to write a new static member function to instead of the
operator
new.
But How the constructor gets called?Is it called from operator new
function or is it called after operator new function?
for instance:
class MyClass {
public:
static MyClass* New();
// using keyword "protected" means it can be derived.
// using keyword "private" means it cannot be derived any more.
protected:
MyClass();
};
int main() {
...
MyClass* pMyClass = MyClass::New();
...
delete pMyClass;
...
}
"siddhu" <siddharth....@gmail.com>
??????:1178898305.430200.284...@h2g2000hsg.googlegroups.com...
On May 11, 11:27 am, siddhu <siddharth....@gmail.com> wrote:
A correction in the code snippet..
Dear Experts,
I want to make a class whose objects can be created only on heap.
I used the following approach.
class ss
{
ss(){}
public:
void* operator new(size_t sz)
{
cout<<"in new"<<endl;
return malloc(sz); //return new char[sz];
//sorry..... my
mistake
}
void operator delete(void* m)
{
free(m);
}
};
int main()
{
ss* s = new ss;
return 0;
}
But when I do
ss* s = new ss;
compiler complains that constructor ss::ss() is private.
As operator new function is member of class so compiler should not
complain because operator new function can call the default
constructor even if it is private.
I am surprised and confused.
Suggestions would be of great help.
Regards,
Siddharth- Hide quoted text -
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