I was playing around with a simple example, where I tried to add a
default constructor to a struct, but it doesn't look like structs can
use the _ctor methods. With this module:
open module Vector3
{
struct vector3 = { x:float; y:float; z:float; };
fun _ctor_vector3 () => vector3(0.0f, 0.0f, 0.0f);
}
instance Str[Vector3::vector3] {
fun str (v:Vector3::vector3) =>
'Vector3::vector3(' +
(f'%f, %f, %f' (double v.x, double v.y, double v.z))
+ ')';
}
This:
val v1 = Vector3::vector3 (1.0f, 2.0f, 3.0f);
println v1;
prints out:
Vector3::vector3(1.000000, 2.000000, 3.000000)
whereas this:
val v0 = Vector3::vector3 ();
println v0;
errors out with:
CLIENT ERROR
[lookup_qn_with_sig] Struct constructor for vector3 has wrong signature, got:
float<2068> * float<2068> * float<2068> -> Vector3::vector3<5144>
expected:
unit
In ./felix/vector.flx: line 3, cols 3 to 50
2: {
3: struct vector3 = { x:float; y:float; z:float; };
************************************************
4:
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