io - The number of bytes read and unsigned numbers -


as example clarify question, in google go 1.0, following interface defined in "io" package:

type reader interface {     read(p []byte) (n int, err error) }

especially result parameter list (n int, err error) intrigues me. intrinsically number of bytes can not negative, according documentation of interface:

it returns number of bytes read (0 <= n <= len(p))[...]

in c reason use int in-band value -1 signal error condition (see effective go: multiple return values). because of multiple return values, special in-band values not necessary.

there exists type uint in go 1.0.

what specific reason using int versus uint in case of values use positive range [0,∞) without need having special in-band values?

the de facto numeric type integers in cases int. example, len(x) , cap(x) return int values though cannot negative. in cases returning int helps avoid type conversions between different numeric types.

so yes, read() have returned uint, make more unwieldy work with.


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