string
to int
signedness casting GO-E1006It is possible for integer casting, if not appropriately done to lose the signedness of the integer and might cause overflow as well.
For example:
- int64
must not be casted to: "uint8", "uint16", "uint32", "uint64", "int8", "int16", "int32"
int64
can lose signedness if converted to unsigned integer and if converted to
a signed integer but a type other than int64
, then overflow might occur.
uint64
must not be casted to: "uint8", "uint16", "uint32", "int8", "int16", "int32", "int64"
uint64
would lose signedness if converted to a signed integer and might overflow.
If converted to an unsigned integer, i.e., a type other than uint64
, overflow
might occur.n, err := strconv.Atoi("42")
if err != nil {
panic(err)
}
// `n` is of type `int`, so it is either `int64` or `int32` depending on the platform.
// Casting it to `uint8` might result in loss of signedness of the integer and might
// not give expected results.
_ = uint8(n)