Hello,
Conversion to complex numbers should be done with the complex builtin
function, specifying a real and imaginary part. However, is casting to a
complex type supported or not? Empirically, it seems to me that sometimes
it is and sometimes it isn't. More confusing is that this behaviour changed
between version 1.13.6 and 1.14.
Using this test program.
package main
import "testing"
// int -> complex
const constInt = 1
func TestConstInt(t *testing.T) {
_ = complex64(constInt)
}
const constIntExplicit = int(1)
func TestConstIntExplicit(t *testing.T) {
_ = complex64(constIntExplicit)
}
func TestVarInt(t *testing.T) {
varInt := 1
_ = complex64(varInt)
}
func TestVarIntExplicit(t *testing.T) {
varIntExplicit := int(1)
_ = complex64(varIntExplicit)
}
// float -> complex
const constFloat = 1
func TestConstFloat(t *testing.T) {
_ = complex64(constFloat)
}
const constFloatExplicit = float64(1)
func TestConstFloatExplicit(t *testing.T) {
_ = complex64(constFloatExplicit)
}
func TestVarFloat(t *testing.T) {
varFloat := 1
_ = complex64(varFloat)
}
func TestVarFloatExplicit(t *testing.T) {
varFloatExplicit := float64(1)
_ = complex64(varFloatExplicit)
}
Summary of results:
1.13.6
1.14.1
const int y y
const int (explicit type) y n
variable int n n
variable int (explicit type) n n
const float y y
const float (explicit type) y n
variable float n n
variable float (explicit type)
n n
I wouldn't want to argue too strongly on this point but for consistency,
should casting be allowed at all?
Regards
Stephen Illingworth
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