Re: typedef query

[Bruno H. <br...@cl...>]

Compro Prasad wrote:
> According to what I have seen, 32 bit systems have sizeof(long) as 32
> bits and on 64 bit systems it is 64 bits.

On 64-bit native Windows, 'long' is 32 bits, not 64 bits. That is,
'long' can be smaller than a 'void *'.

> So, why trust "long".

The code trusts the type whose width it has determined. The point of
the 'uint32', 'uint64' types is to use *not* make assumptions about
the width of a specific type such as 'int' or 'long'. Computer architectures
evolve.

> Why not use "int" for 32 bits and "long long" for 64 bits? If there is a
> problem then what is it?

Until recently (2015), you could not use 'long long' portably. Now,
finally, MSVC has this type too.

Bruno