#error sizeof(void *) is neither sizeof(int) nor sizeof(long) nor sizeof(long long)

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4.00/5 (3 votes)

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What exactly this thing do? It is a preprocessor?

The code with that element is:

C++

#if SIZEOF_CHARP == SIZEOF_INT
typedef int intptr;
#elif SIZEOF_CHARP == SIZEOF_LONG
typedef long intptr;
#elif SIZEOF_CHARP == SIZEOF_LONG_LONG
typedef long long intptr;
#else
#error sizeof(void *) is neither sizeof(int) nor sizeof(long) nor sizeof(long long)
#endif

on

C++

#error sizeof(void *) is neither sizeof(int) nor sizeof(long) nor sizeof(long long)

compiler writes the error C1189 (Visual Studio 2008). Can you help me with it?

Edit - moved information from OP here

Posted 22-May-12 4:12am

Je7

Updated 22-May-12 4:59am

lewax00

v3

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lewax00 22-May-12 11:00am

You can add additional information by clicking "Improve question", it shouldn't be added a a solution (where it may not be seen)

2 solutions

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Mihai Vrinceanu · Accepted Answer · 2012-05-22T04:35:00

It is generated by the compiler. sizeof(void*) depends for which system you are compiling. For example, if you compile for Window XP 32 bit or Linux 32 bit, sizeof(void*) will be 4 because the size of a memory address is 32 bits (4 bytes).
If you compile for Windows XP 64 bit or Windows Vista 64 bit or Windows 7 64 bit or Linux 64 bit, the size of a memory address will be 64 bits (8 bytes) and sizeof(void*) will be 8. sizeof(int) will be 4 (32 bits).

PS: A pointer is a variable which stores a memory address.

lewax00 · Accepted Answer · 2012-05-22T05:07:00

Solution 3

Its purpose is to throw an error (see this page[^]). Although, looking at the section it's in, I find it odd that it should be thrown at all unless SIZEOF_CHARP, SIZEOF_INT, SIZEOF_LONG, or SIZEOF_LONG_LONG are set incorrectly. To my knowledge, int is almost always the same size as a pointer for the system.

I'm guessing from your question you didn't write that code, where did it come from?

Posted 22-May-12 5:07am

lewax00

Comments

Je7 22-May-12 11:13am

It is code from TrinityCore sources http://www.trinitycore.org/. I should to look all the commits to the core(I have private core) and maybe will found the solution.

lewax00 22-May-12 11:20am

Looks like this person was having the same problem and fixed it: http://www.trinitycore.org/f/topic/6302-335a-compiling-issue/

Je7 22-May-12 11:28am

This error as a result of my inattention. Thx for solution.

P.S.: I am for the first time on your site, it's very helpful.

Aescleal 22-May-12 11:38am

Alas the assumption was for years that a pointer and int were the same size. However this isn't the case any more - most compiler vendors have decided that there's no point in having a default 64 bit int.

Luckily I gave up casting pointers to ints ages ago.

lewax00 22-May-12 11:53am

Well in any case int generally isn't smaller than a pointer, so it should be int, long, or long long. But I agree, casting seems unnecessary (if you really need a generic pointer form, void* already exists, though C++ should be utilizing templates instead).