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Quick C++ question.

Started by vNistelrooy Apr 18, 2004 at 7:52 AM 5 replies 250+ views

Original Post

Apr 18, 2004 at 7:52 AM

class C_A_Class_OMG
{
   void A_Function_OMG(void* Parameters_OMG);
};

C_A_Class_OMG *a=new C_A_Class_OMG;

How much RAM will a take?

"C lets you shoot yourself in the foot rather easily. C++ allows you to reuse the bullet!"

mattd

Apr 18, 2004 at 7:59 AM

1 byte?

vNistelrooy

Apr 18, 2004 at 8:01 AM

quote:
Original post by mattd
1 byte?

It is 4byte at least because of the pointer, but does the functions add anything?

"C lets you shoot yourself in the foot rather easily. C++ allows you to reuse the bullet!"

Andrew Russell

Apr 18, 2004 at 8:03 AM

[forget it, I don't think I know what I'm talking about]

[edited by - Andrew Russell on April 18, 2004 9:08:04 AM]

mattd

Apr 18, 2004 at 8:04 AM

No, because the functions aren't virtual. And since new must always attempt to return a valid pointer, even if 0 bytes are requested, it allocates 1 byte.

If you have MSVC, check malloc.c:


         if (size == 0)
            size = 1;

A will take up 4 bytes on the stack.

[edited by - mattd on April 18, 2004 9:06:34 AM]

vNistelrooy

Apr 18, 2004 at 8:05 AM

I''m talking about VC++7. Oh well I guess I will have to check myself. >__<

"C lets you shoot yourself in the foot rather easily. C++ allows you to reuse the bullet!"

vNistelrooy

Apr 18, 2004 at 8:05 AM

quote:
Original post by mattd
No, because the functions aren''t virtual. And since new must always return a valid pointer, even if 0 bytes are requested, it allocates 1 byte.

If you have MSVC, check malloc.c:

if (size == 0)
size = 1;

A will take up 4 bytes on the stack.

Thank you.

"C lets you shoot yourself in the foot rather easily. C++ allows you to reuse the bullet!"

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