Re: Promoting unsigned long int to long int

pereges wrote:

btw, i see a lot of people saying that size_t must be used over
unsigned long. The question is are there any fix guidelines as to when
i should and when i shouldn't use size_t. It seems to me that size_t
is most commonly used in three situations :

1. Size of array or any object.

This is the purpose of size_t.

2. Array indices.

IMHO, any unsigned type of suitable range will do. Sometimes signed
types are convenient too, for certain forms of loops, and rarely, to
index with a negative offset.

3. Count of something.

Again a suitable unsigned type, not necessarily size_t should be okay.

Although I don't see why using unsigned long for any of the above
could be wrong. It may not be a necessity to use size_t

You are correct. In C, size_t has the only purpose of being large enough
to hold the size in bytes of the largest possible single object. Also
the sizeof operator yields a size_t value for related reasons. It is
not necessarily a suitable type for counting things are holding
offsets, indexes and such.

Generally, a careful examination of the origin, purpose and types of use
a value may be subject to will give you a clue as to the most suitable
type of object to represent it.

.

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