Storing address of pointer (cross platform)

[howa]

In 32 bit pc, I can write

e.g.

char* p1 = "apple";
cout<<(int)p1;


In 64 bit pc, I need to use

char* p1 = "apple";
cout<<(__int64) p1;


What are the cross platform way to so?

Thanks.

[=?UTF-8?B?RXJpayBXaWtzdHLDtm0=?=]

Re: Storing address of pointer (cross platform)

On 2008-01-19 13:47, howa wrote:

In 32 bit pc, I can write
>
e.g.
>
char* p1 = "apple";
cout<<(int)p1;
>
>
In 64 bit pc, I need to use
>
char* p1 = "apple";
cout<<(__int64) p1;
>
>
What are the cross platform way to so?

If your platforms have C compilers providing <stdint.hyou can check if
they define the typedef intptr_r or uintptr_t, they should be large
enough for a void pointer. If you do not have those typedefs you need to
provide them (or similar) on your own.

--
Erik Wikström

[howa]

Re: Storing address of pointer (cross platform)

On 1月19日, 下午9時12分 , Erik Wikström <Erik-wikst...@telia. comwrote:

On 2008-01-19 13:47, howa wrote:
>

In 32 bit pc, I can write

>

e.g.

>

char* p1 = "apple";
cout<<(int)p1;

>

In 64 bit pc, I need to use

>

char* p1 = "apple";
cout<<(__int64) p1;

>

What are the cross platform way to so?

>
If your platforms have C compilers providing <stdint.hyou can check if
they define the typedef intptr_r or uintptr_t, they should be large
enough for a void pointer. If you do not have those typedefs you need to
provide them (or similar) on your own.
>
--
Erik Wikström

Thanks.

[=?iso-8859-1?q?Tom=E1s_=D3_h=C9ilidhe?=]

Re: Storing address of pointer (cross platform)

howa:

In 32 bit pc, I can write
>
e.g.
>
char* p1 = "apple";
cout<<(int)p1;
>
>
In 64 bit pc, I need to use
>
char* p1 = "apple";
cout<<(__int64) p1;
>
>
What are the cross platform way to so?

I'm not sure if cout can print a pointer, but printf certainly can:

int i;

printf("%p",(vo id*)&i);

--
Tomás Ó hÉilidhe

[Rolf Magnus]

Re: Storing address of pointer (cross platform)

howa wrote:

In 32 bit pc, I can write
>
e.g.
>
char* p1 = "apple";
cout<<(int)p1;
>
>
In 64 bit pc, I need to use
>
char* p1 = "apple";
cout<<(__int64) p1;
>
>
What are the cross platform way to so?

cout << static_cast<voi d*>(p1);

[James Kanze]

Re: Storing address of pointer (cross platform)

On Jan 19, 1:47 pm, howa <howac...@gmail .comwrote:

In 32 bit pc, I can write

e.g.

char* p1 = "apple";
cout<<(int)p1;

In 64 bit pc, I need to use

char* p1 = "apple";
cout<<(__int64) p1;

(A more portable 64 bit type would be long long.)

What are the cross platform way to so?

cout << static_cast< void* >( p1 ) ;

It's the only way guaranteed to work everywhere.

It doesn't allow you to control the output format in any way,
however. If you need to control the output format, something
like:
cout << static_cast< uintptr_t >( p1 ) ;
will usually work (but uintptr_t is not guaranteed to be present
on a machine where pointers are larger than 64 bits).

If you have to work with an older compiler, which doesn't
support the new integer types, then casting to size_t is often
OK (although I've used platforms where it wouldn't work).

--
James Kanze (GABI Software) email:james.kan ze@gmail.com
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