[Qt-interest] When to use QT primitives ?

[Kosta]

Thank you very much about the detail answer, Marco.

Regards,
Kosta
----- Original Message ----- 
From: "Marco Borm" <qt-lists at retrodesignfan.eu>
To: <qt-interest at trolltech.com>
Sent: Sunday, May 24, 2009 4:14 PM
Subject: Re: [Qt-interest] When to use QT primitives ?


> Simple answer: Because it is not the same. qint32 can hold 32bits on
> every platform, int not.
>
> Complex reason:
> Even typical int is 32bit there are platforms where int is 16bit or
> 64bit. So if you use int you have to check yourself how many bits it can
> hold on every platform your compile your application. The same for every
> other primitive data type. This makes it nearly impossible to directly
> use the primitive data types for portable network communication.
> For that reason nearly every compiler provides non standard fixed length
> types like __int32 on MSVC.
>
> "ISO/IEC 9899:1990, Programming Languages - C (ISO C) left the
> definition of the *short int*, the *int*, the *long int*, and the
> *pointer* deliberately vague to avoid artificially constraining hardware
> architectures that might benefit from defining these data types
> independent from the other. The only constraints were that *int*s must
> be no smaller than *short*s, and *long*s must be no smaller than *int*s,
> and *size_t* must represent the largest unsigned type supported by an
> implementation. It is possible, for instance, to define a *short* as 16
> bits, an *int* as 32 bits, a *long* as 64 bits and a *pointer* as 128
> bits. The relationship between the fundamental data types can be
> expressed as:
>
> /sizeof(char) <= sizeof(short) <= sizeof(int) <= sizeof(long) =
> sizeof(size_t)"/
>
>
> Marco
>
> Kosta wrote:
>> One simple question. Why to use QT Primitives, i.e. qint32 instead of
>> int ?
>>
>>
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