gpraghuram  1,275
Recognized Expert Top Contributor
HI All,
Someone asked me the following question and i am not able to get an answer for this.
In c++ how will you restrict
1)object creation in heap
2)object creation in stack
Can anyoine throw some light into this
Raghuram
6 7899 
Hello,
To create an object in heap, you can allocate it through `new` keyword.
To create an object in stack, you can define it as a local variable, in a function or a method.
JosAH 11,448
Recognized Expert MVP
HI All,
Someone asked me the following question and i am not able to get an answer for this.
In c++ how will you restrict
1)object creation in heap
2)object creation in stack
Can anyoine throw some light into this
Raghuram
Ruskalym (see above) already answered your question: if you don't want users
to be able to create objects on the heap, overload the new operator such that
it throws an error (or make it a private operator so that the user can't access it).
If you don't want objects on the stack you could make all constructors private
and add a 'factory method' that builds objects on the heap for the user.
kind regards,
Jos
gpraghuram 1,275
Recognized Expert Top Contributor
Ruskalym (see above) already answered your question: if you don't want users
to be able to create objects on the heap, overload the new operator such that
it throws an error (or make it a private operator so that the user can't access it).
If you don't want objects on the stack you could make all constructors private
and add a 'factory method' that builds objects on the heap for the user.
kind regards,
Jos
Thanks a lot Jos....
I got the answer.
How can you make new operator private?
Did u mean that overloading shuld be made private?
Raghuram
JosAH 11,448
Recognized Expert MVP
Thanks a lot Jos....
I got the answer.
How can you make new operator private?
Erm, you can't; I goofed (I had some strange sort of Java code in my head when
I wrote that (incorrect) remark). It is possible to supply your own implementation
for the global operator new() though; I think that's the way to go if you don't want
any objects on the heap.
Sorry for the mistake and
kind regards,
Jos
Dear Jos:
>>It is possible to supply your own implementation
>>for the global operator new() though;
If I can implement the global operator new(), I can calculate the total heap usage for C++ object creation on my system.
In c++ how will you restrict
1)object creation in heap
>>
make private the following functions:
void *operator new(size_t),
void *operator new[](size_t)
2)object creation in stack
>>
make constructor and destructor private
have seperate static functions like create and destroy functions which will internally call constructor and destructor respectively
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