RE: [Dev-C++] new is a wrapper around malloc so...

[Abhijit S. <mu...@gm...>]

> In 16 bit your code is separated into 'segments' each a maximum of 64k in
> size. 32-bit can have up to 2GB segments (!!!).

4G, right? (2^32).

However, that's true only on a 32-bit system (as you've said)... what
platform are you building on? On 16-bit (`real-mode') DOS, even though
sizeof(farptr) will give you four, it cannot address 32-bits worth of
memory. Far pointers work like this:

	32 bits of farptr  =
	16 bits of segment .
	16 bits of offset

The effective address is actually calculated by multiplying the segment by
16 decimal (0x10 (which is equivalent to left-shifting by four)) and then
ADDING the offset... so that if your far-ptr has this value:

	0x1234abcd

Written as:

	1234:abcd

Its effective address, which is worth 20-bits (and can therefore address
2^20 = 1M) is calculated  as:

	0x12340
+	 0xabcd
-------------
=	0x1cf0d

Whereas, in the flat memory model(protected-mode), the effective address
would itself be

	0x1234abcd

--
Abhijit Shylanath
Homepage: http://mudeth.tripod.com/