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I want to use a u_int64_t variable as search key,
is u_int64_t available on 32-bit machine?
if not, I have to divide this variable into two varibles? then as a search key, it is a bit more troublesome
are there any workaround for this?
366
uint64_t doesn't call anything, it is just a 64bit unsigned integer. This code is a function named clearBits() that is manipulating bits in an integer and returning the result.
In 32-bit mode, the compiler (more precisely the <stdint. h> header) defines uint64_t as unsigned long long , because unsigned long isn't wide enough. In 64-bit mode, it defines uint64_t as unsigned long .
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.
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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.
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