The lomg long type in 64-bit address mode.

[Vladimir Grigoriev]

Just a qyestion: In a 64-bit address mode the long long type is usually
equal to the long type?

Vladimir Grigoriev

[Victor Bazarov]

Post by Vladimir Grigoriev
Just a qyestion: In a 64-bit address mode the long long type is usually
equal to the long type?

No. 'long' is 4 bytes, 'long long' is 8.

V

[Vladimir Grigoriev]

Victor, are you sure? In some 64-bit address mode systems long is 8-bytes.
However I do not know yet what about the long long type..

Vladimir Grigoriev

Post by Victor Bazarov

Post by Vladimir Grigoriev
Just a qyestion: In a 64-bit address mode the long long type is usually
equal to the long type?

No. 'long' is 4 bytes, 'long long' is 8.
V
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[Jochen Kalmbach [MVP]]

Hallo Vladimir!

Post by Vladimir Grigoriev
Victor, are you sure? In some 64-bit address mode systems long is 8-bytes.
However I do not know yet what about the long long type..

http://msdn.microsoft.com/en-us/library/s3f49ktz.aspx

[Ulrich Eckhardt]

Post by Vladimir Grigoriev
Victor, are you sure? In some 64-bit address mode systems long is 8-bytes.

MS Windows is unfortunately not one of them, they decided that long shall
keep its size on both 32 and 64 bit platforms.

Post by Vladimir Grigoriev
However I do not know yet what about the long long type..

The long long type defined by C99 is at least 64 bits. Even for win64 it is
not bigger.

Uli

[Vladimir Grigoriev]

Thanks, Ulrich. Yesterday I knew that on IBM 64-bit platform long and long
long both are 8 bytes.

Vladimir Grigoriev

Post by Ulrich Eckhardt

Post by Vladimir Grigoriev
Victor, are you sure? In some 64-bit address mode systems long is 8-bytes.

MS Windows is unfortunately not one of them, they decided that long shall
keep its size on both 32 and 64 bit platforms.

Post by Vladimir Grigoriev
However I do not know yet what about the long long type..

The long long type defined by C99 is at least 64 bits. Even for win64 it is
not bigger.
Uli
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[Ben Voigt [C++ MVP]]

Post by Ulrich Eckhardt

Post by Vladimir Grigoriev
Victor, are you sure? In some 64-bit address mode systems long is 8-bytes.

MS Windows is unfortunately not one of them, they decided that long shall
keep its size on both 32 and 64 bit platforms.

More correct to say: Visual C++ is not one of them. Size of C and C++
integral types is set by the compiler manufacturer.

On the other hand, LONG, which is defined by the windows API, is always
32-bits. But long can vary.



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[Tim Roberts]

Post by Vladimir Grigoriev
Victor, are you sure? In some 64-bit address mode systems long is 8-bytes.
However I do not know yet what about the long long type..

Both of you are correct. In some 64-bit systems, long is 8 bytes. In gcc,
for example, "long" is 8 bytes in 64-bit systems, while "int" is 4 bytes.

Microsoft happens to have chosen to set both "int" and "long" to 4 bytes in
both 32-bit and 64-bit systems.

[Ulrich Eckhardt]

Post by Tim Roberts
Both of you are correct. In some 64-bit systems, long is 8 bytes.
In gcc, for example, "long" is 8 bytes in 64-bit systems, while "int" is
4 bytes.

Actually, that's not completely true. A win64-port must also use a 4-byte
long type and an 8-byte long long type. As you say, it depends on the
system.

Uli

[Ben Voigt [C++ MVP]]

Post by Ulrich Eckhardt

Post by Tim Roberts
Both of you are correct. In some 64-bit systems, long is 8 bytes.
In gcc, for example, "long" is 8 bytes in 64-bit systems, while "int" is
4 bytes.

Actually, that's not completely true. A win64-port must also use a 4-byte
long type and an 8-byte long long type. As you say, it depends on the
system.

Actually I think it only has to provide matching winbase.h which sets the
macro LONG properly (using a 32-bit signed integer type), with no
restrictions on the C++ keyword "long".

Post by Ulrich Eckhardt
Uli
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[Tim Roberts]

Post by Ulrich Eckhardt

Post by Tim Roberts
Both of you are correct. In some 64-bit systems, long is 8 bytes.
In gcc, for example, "long" is 8 bytes in 64-bit systems, while "int" is
4 bytes.

Actually, that's not completely true. A win64-port must also use a 4-byte
long type and an 8-byte long long type.

Not so. The 64-bit gcc compiler, even when running on Windows, defines
"long" as an 8-byte type.

That has implications if you hope to use SDK include files. It means you
must make sure that you have this somewhat unintuitive set of definitions:

typedef int LONG, *PLONG;
typedef unsigned int ULONG, *PULONG;

Post by Ulrich Eckhardt
As you say, it depends on the system.

It depends on the COMPILER.

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See "Data model": http://www.viva64.com/terminology/Data_model.html