size_t is a C
variable type which is often used to contain the size
. While it is usually
defined to be unsigned int
it is by no means guaranteed to be so!
If you assume that size_t is the same as an unsigned int
, your code might have
problems on certain 64-bit
Some examples of functions that use size_t:
In addition to this, C provides the sizeof
operator. It returns the size of a variable
or data type, so naturally size_t
is its return value.
There are other types with similar uses to size_t. One (thanks tftv256) is ssize_t,
which is a signed version. It allows functions such as write() to return a -1
for, say, an error indicator. Another is socklen_t, which serves only the mere purpose
of holding the size of a struct sockaddr_t, for functions such as connect() and such.
There are likely more.