CODEWITHSUNDEEP
clinux
user1944267
user1944267

Reputation: 1637

Is u_int64_t available on 32-bit machine?

I want to use a u_int64_t variable as search key.

Is u_int64_t available on 32-bit machine?

If not, do I have to divide this variable into two variables? Then as a search key, it is a bit more troublesome.

Are there any workarounds for this?

Upvotes: 16

Views: 14980

Answers (3)

asio_guy
asio_guy

Reputation: 3767

As per some of the documentation or reading its not quite clear __GLIBC_HAVE_LONG_LONG is the one that defines its presence in 32 bit architecture.

A probable solution for usage could be something similar to below:

#include <sys/types.h>

#ifdef __GLIBC_HAVE_LONG_LONG

    u_int64_t i;

#endif

Oh by the way this is in Linux

Upvotes: 0

Barath Ravikumar
Barath Ravikumar

Reputation: 5836

Yes 64 bit integer datatype is supported on a 32 bit machine.

In C89 Standard , long long (≥ 64, ≥ size of long) type is supported as a GNU extension. In C99 standard, there is native support for long long(≥ 64, ≥ size of long) integer.

Upvotes: 5

user4815162342
user4815162342

Reputation: 155216

An unsigned 64-bit integral type is not guaranteed by the C standard, but is typically available on 32-bit machines, and on virtually all machines running Linux. When present, the type will be named uint64_t (note one less underscore) and declared in the <stdint.h> header file.

Upvotes: 18

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