Newtype is a expression like
type MyInt int
It's not the same type as int, so why it's permitted?
In Go1 you must perform explicit conversion.
For example,
type Float interface {
type float32, float64
}
func NewtonSqrt(type T Float)(v T) T {
var iterations int
switch (interface{})(v).(type) {
case float32:
iterations = 4
case float64:
iterations = 5
default:
panic("unreachable") // float cannot be nil, any other types are prohibited
by type checker
}
// Code omitted.
}
type MyFloat float32
var myFloatValue MyFloat = MyFloat(64)
var G = NewtonSqrt(float32(myFloatValue)) // MyFloat is converted to
float32 explicitly
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